Completed Projects
Das Projekt A07 unter Leitung von Prof. Alexander Eychmüller konzentriert sich auf die Anwendung chemischer Ansätze, um 2D Anordnungen geschichteter Nanoplättchen (NPLs), in verschiedenen Geometrien zu generieren. Dies impliziert ebenso größere NPL-Netzwerke, die über ihre Spitzen miteinander verbunden sind, 2D Schichten in verschiedenen Auslegungen, die über ihre Spitzen und Kanten miteinander verbunden sind sowie Strukturen die durch Sintern von NPLs und 2D Wachstum gewonnen wurden. Bei den eingesetzten NPLs handelt es sich zunächst um CdSe NPLs mit einer genau kontrollierten Dicke, d.h. drei, vier, fünf und sechs CdSe-Monolagen. Auch andere experimentell etablierte NPLs wie InSe und PbS können folgen, ebenso wie deren Kombinationen und solche, die durch Ionenaustauscherreaktionen produziert werden. Darüber hinaus werden die optoelektronischen Eigenschaften der 2D Baugruppen und die kollektiven Wechselwirkungen innerhalb von Baugruppen charakterisiert.
project leader: Prof. Dr. Alexander Eychmüller
duration: 2020-2024
external source: DFG
collaborate research center 1415
scientist: Shamraienko, Volodymyr
MINARECO will develop microfluidic sensor platform based on nanogels and will establish long-time cooperation between project partners from Germany and Turkey.
From the point of view of nanosensors for health and the environment, the development of microfluidic systems based on nanogels represents a novel, convenient and very general platform that will serve as a basis for the development of a variety of multiparametric sensors of a new generation. They will enable, for example, multiparametric detection of some diagnostic-relevant antibodies, of antibiotics as well as of reactive oxygen species.
In more details, the project will focus on the fabrication of light-emitting nanogels consisting of environmentfriendly colloidal inorganic nanocrystals. The gel networks will incorporate the biorecognition complexes specific to the antibodies, antibiotics or reactive oxygen species. Both chemical interactions and optical coupling between the components of the hybrid gel will be investigated. The sensing function will be realized by combining the specific recognition capability with the modulation of the optical properties of the hybrid nanogel. The resulting nanostructured optical microsensors will be precisely positioned within the microfluidic channels, moreover, several optimal layouts of the microfluidic systems enabling their combination with the spectroscopic multichannel setup will be demonstrated.
duration: 2021-2024
project leader: Prof. Dr. Alexander Eychmüller
source: BMBF
DLR project link 01DJ21009
partner:
Bilkent University, Ankara
external source: DLR Projektträger, Europäische und internationale Zusammenarbeit
scientist: Starzynski, Thorben
Duration:
05/2022-04/2024 financed from Humbodt Fellowship
05/2024-07/2024 financed from TU Fellowship
Methanol steam reforming is an industrial process that is used to generate energy from methanol as an alternative to fossil fuels. For this purpose, metal/metal oxide aerogel catalysts with large surfaces and a pronounced pore system are developed. An epoxy-assisted synthesis will be used and a water-based green synthesis route will be developed.
duration: 2019-2023
external source: Deutsche Bundesstiftung Umwelt DBU fellowship data
scientist/fellowship holder: Thoni, Lukas
Colloidal semiconductor nanocrystals (NCs) attract immense interest both from the scientific community and industrial companies/startups, due to their unique optical properties that are tunable in a wide range through changing their
composition, size, shape, etc. However, currently, the implementation of the well-developed NCs in consumer products is hindered by the presence of toxic cadmium and the development of “Cd-free” NCs, investigation and optimization of their
properties are important challenges in the field. Among the most promising “Cd-free” alternatives are indium phosphide (InP) NCs but despite all advances in their synthesis, there is still a need to achieve narrow fluorescence of such NCs – a
parameter crucial for their applications in light-emitting devices (e.g. in displays).
In this project, we propose a novel approach to solve this issue, which consists in the chemical synthesis of two-dimensional InP nanoplatelets (NPls). To achieve this, two strategies will be examined: recrystallization of small InP NCs and cation
exchange. The research of the first strategy will involve studying precursor reactivity, searching for a suitable promoter of anisotropic growth, and on the optimization of the reaction conditions. The cation exchange strategy will focus on the
investigation of the incorporation of indium ions into the pre-synthesized Cu3-xP NPls to achieve complete cation exchange. In the next stages, further work will concentrate on the optimization of obtained NPls for practical applications through achieving spectral tunability by alloying and through maximizing photoluminescence quantum yield and stability by covering InP NPls with a wide bandgap shell. Additionally, to demonstrate the application potential of the prepared NPls and related heterostructures the extensive characterization of chemical and physical properties of InP NPls will be conducted with the
specific focus on the properties relevant for light-emitting applications.
project proposal: Proposal number: 101031243
project leader: Dr. Vladimir Lesnyak
researcher: Dr. Artsiom Antanovich
project duration: 04/2021- 03/2023
external ressource: EU (Horizon 2020, MSCA-IF-2020) CORDIS HORIZON 2020 projects
In dem vorliegenden Projekt planen wir erstmalig die Entwicklung von luftstabilen Nanoplättchen-Mikropulvern (NMP) in Salz-Matrizen zur Anwendung in der Hintergrundbeleuchtungstechnik. Die Einzigartigkeit des Projektes liegt dabei in der Stabilität der NMP, die durch eine zusätzliche Sauerstoffbarriere im Zuge einer lösungsbasierten Technik verbessert wird. Im Gegensatz zu unseren vorhergehenden Forschungsprojekten, wo wir eine erhöhte Photo-und Wärmestabilität aufgrund der Einkapselung der Makrokristallfilme in herkömmlichen Epoxiden zeigten, hat dieses Projekt die vollständig luftstabile Farbanreicherung ohne jegliche Einkapselung zum Ziel. Dafür werden die Nanoplättchen-Mikropulver mit zusätzlichen Aluminium- und Zinksalzen in Lösung behandelt. Insgesamt kann so die Farbvielfalt der Displays im Vergleich zu allen vorhandenen Technologien signifikant verbessert werden, wobei wir von der hervorragenden Farbreinheit sowie der schmalbandigen Emission der Nanoplättchen (NPL), auch als kolloidale Quantentöpfe bezeichnet, profitieren.
project leader: Prof. Dr. Nikolai Gaponik
duration: 2020-2022
externel source: BMBF (TUBITAK) project 01DL20002
project partner: Bilkent University Türkei
Research:
Camila is working on novel titanium dioxide-based photocatalysts for the remediation of microplastic pollution, in particular for the separation and degradation of microplastics in aquatic systems. The aim is to remove microplastics from wastewater before it is discharged into rivers and oceans.
Duration:
09/2022-11/2022
external Source:
Bundesministerium für Bildung und Forschung
supervisor:
Dr. Juliane Simmchen
The project MiLEDI ambitions the realization of micro-Light Emitting Diode (mQDL) and micro Quantum Dots Organic Light Emitting Diode (mQDO) RGB arrays by using direct laser/electron beam patterning of quantum dots (QDs).
The main idea sustaining the project is that the QDs are formed directly by laser or electron beam technology over a matrix of blue emitting micro QDL/QDO arrays, so the QDs act as light down converters constituting a RGB micro display.
Both technologies will be thoroughly developed to optimize the QD light emission spectrum and their stability, they are expected to provide two degrees of patterning resolution. The laser beam has a potential to pattern spot areas down to 5 x 5 µm2 scale, while the electron beam can go below 2.5 x 2.5 µm2 and both of them grant high flexibility in production.
Moreover the validation of the MiLEDI approach for both micro QDL and QDO RGB displays manufactured by direct laser/electron beam patterining of QDs, will be done by the production of a final prototype of Rear Projection display through the existing supply chain of the project.
website: https://www.miledi-h2020.eu/
duration: 2018 - 2022
external source: EU
In the ongoing transition towards the generalized use of emission-neutral energy production, storage and conversion technologies, the use of intermittent electricity to electrochemically reduce CO2 into added-value chemicals (e.g., CO or HCOO−) is increasingly appealing. However, the commercial success of this CO2-valorization approach passes by the development of co-electrolysis cells capable of reaching current densities ≥ 200 mA∙cmgeom-2, which in terms requires highly-dispersed and -active materials for catalyzing the reactions taking place inside the cell. Among these, the electroreduction of CO2 is particularly challenging, not only due to the large overpotential that it requires, but also in sight of the difficulties associated to the control of its product selectivity. These key features can be optimized by tuning the adsorption properties of the reaction’s intermediates on the catalyst’s surface, e.g., by shifting the position of its d-band center or by adding other adsorbates that modify the interactions among these intermediates and the surface. The work presented herein explores both of these approaches by tackling the synthesis of high surface area, tridimensional nano-networks (aerogels) with bi-metallic compositions (PtPd or AuCu alloys/cores-hells) or with their surface functionalized with adsorbed N-containing ligands, respectively. Following a systematic study of the effect of various synthesis parameters on the aerogels’ structure and surface vs. bulk composition, electrochemical measurements complemented by operando X-ray absorption spectroscopy will shed light on the extent to which these parameters determine the gels’ reactivity. The subsequent implementation of selected aerogels in an in-house co-electrolysis cell will allow (for the first time) to verify whether the reactivity trends observed in aqueous electrochemical tests (customarily used in the field) extend to the application-relevant co-electrolysis setup. Most importantly, these results will serve to assess the commercial feasibility of this CO2-to-products approach, in terms of the maximum efficiencies and product-specific currents (i.e., operative potentials and selectivities) attainable in this device.
project partner: Electrochemistry Laboratory, Paul Scherrer Institut (lab leader: Prof. Dr. Th. J. Schmidt)
duration: 2018 - 2022
external source: DFG (D-A-CH Lead-Agency-Agreement)
The aim of this proof of concept project is to create a prototype PEMFC using bimetallic aerogel electrocatalysts from large-scale synthesis (from technology readiness level 3 to 5) and design the optimal route-to-market strategy that would ensure swift adoption of our technology in an industrial setting.
Laufzeit: 2019-2022
Projektleiter: Prof. Dr. Alexander Eychmüller
Mittelgeber: EU (875564 — LAACat — ERC-2019-PoC) ERC POC 2019 2. Runde Förderliste
duration: 2019-2022
external source: SAB (EFRE) projects in Saxony
Extremely highly photoluminescence quantum yields and as high as possible photostability under application-relevant conditions are prerequisites for the use of semiconductor nanocrystals as fluorescent labels and active components in optical devices. A typical approach to achieve and maintain a high photoluminescence quantum yields is the encapsulation of semiconductor nanocrystals into robust and transparent matrices. In this project semiconductor nanocrystals of varying material composition and surface chemistry with emission in the visible and the infrared spectral region should embedding in varying inorganic salt crystals matrices.
duration: 2015 - 2019
external source: DFG
Ziel des Projektes ist die Bearbeitung grundlegender Fragestellungen zur Nutzung von Quantum Dots zur Farbkonversion von hochauflösenden, blau emittierenden Displays in R, G, B- Displays. Der in der Literatur beschriebene Ansatz "Color by Blue", nutzt Konverter-Materialien, um eine Lichtkonversion von blauen in energieärmeres rotes oder grünes Licht zu konvertieren. Dieser Ansatz ist für hochauflösende Displays attraktiv, um hohe Helligkeiten, große Blickwinkelstabilität und einen großen Farbraum zu erzielen.
duration: 2018-2020
external source: SAB/EFRE
The main objective of the project NAFT is the production of gels and aerogels from noble metal nanoparticles which are suitable for ink jet printing processes. By using finest colloidal nanoparticles, highly porous, cross-linked, thin layers are to be realized, which can find applications as catalysts, electrocatalysts or electrochemical sensors. The combination of the TU Dresden expertise in key fabrication technologies with the process engineering infrastructure of Plasmachem GmbH provides the technological prerequisites for achieving an efficient immobilization and contacting of the thin film aerogels on the substrates.
The focus of the NAFT project is on the energy- and resource-friendly use of precious metals as highly effective (electro) catalysts and sensors with a maximum high specific surface area and therefore with minimal possible precious metal consume. From the point of view of energy efficiency, the relatively simple, cost-efficient and widely applicable ink-jet printing process is to be applied.
The assessment of the energy efficiency potential is presented in this application. The overall project description also illustrates the industrial and social relevance of the research approach and explains the scientific and technical work objectives of the project.
duration: 2018 - 2021
external source: BMWi
project leader: Dr. Juliane Simmchen
duration: 2019 - 2020
external source: Alfred-Kärcher-Förderstiftung
Laufzeit: 2019-2020
Mittelgeber: Marie Sklodowska-Curie Fellowship
project leader: Dr. Julianne Simmchen
duration: 2017 - 2019
external source: SAB
project leader: Dr. Juliane Simmchen
duration: 2018-2019
project leader: Dr. Julianne Simmchen
duration: 2017-2018
external source: foundation
Polymer electrolyte fuel cells (PEFCs) have emerged as a promising emission-free technology to supply the worldwide increasing demands for clean and efficient energy conversion. Despite large efforts, the world-wide commercialization of PEFC-based devices still remains a great challenge. To close the existing gap of catalytic active and surface-extended Pt alloys recent developments provide a new class of electrocatalysts so called multimetallic aerogels.
Hence, the goal of the project is to design and prepare advanced multimetallic aerogel electrocatalysts showing superior catalytic performance for the oxygen reduction reaction (ORR) and high long-term durability under operation fuel cell conditions. Therefore, the relationships between structure, composition, shape and reactivity have to be determined. Further, the investigation of durability and chemical stability under strong corrosive conditions are to be addressed in the project.
project partner: Electrochemistry Laboratory, Paul Scherrer Institut (Laborleiter: Prof. Dr. Th. J. Schmidt)
duration: 2014 - 2018
external source: DFG (D-A-CH Lead-Agency-Agreement)
German-Korean Partnership Program
The International Research Training Group was established as a joint project between UNIST (Ulsan National Institute of Science and Technology) and Technische Universität Dresden.
Colloidal synthesis of stable 2D nanomaterials is very significant for various applications. For example, fabrication of nanomaterials by means of wet colloidal approach is a cheap alternative to lithographic techniques used for a production of nanosized electronic circuits. Colloidal nanomaterials can find commercial use as building blocks for inexpensive manufacturing of low cost and large area electronic and optoelectronic devices through solution-based processes, as compared to much more sophisticated and expensive physical (chemical) vapor, atomic layer deposition and other techniques.
The primary objectives of the project are the Synthesis of 2D metal-doped and heterostructured TMD nanosheets and the Characterization and application of the TMD nanosheets
duration: 2017 - 2018
external source: DAAD
duration: 2019-2021
external source: DAAD
ICENAP will design new nanocrystals (quantum dots - QD) and tailor microstructural changes in known ones during processing to obtain the following improved properties: (i) photoluminescent (PL) quantum yield exceeding 90% irrespective of QD concentration; (ii) minimum blinking; (iii) inorganic shells designed to ensure stable QD PL for at least 12 months; and (iv) organic shells ensuring QD stability in biological media for at least 6 months.
New generation QDs will be developed through modeling and simulation using material physics-based design principles. The results will be used for the synthesis of QD cores and their layer-by-layer coating with inorganic shells, utilizing structural models fitting their structure seen in HRTEM. The predicted properties of these multishell QDs will be experimentally validated.
ICENAP combines modeling, simulation and validation of a new class of nanomaterials, which will have a strategic impact and create new dynamism by accumulation of new knowledge along the innovation chain.
project partner: Dr. Ute-Resch Genger (BAM Berlin), Dr. Jan-Ole Joswig (Theoretische Chemie/TU Dresden)
project coordinator: Igor Nabiev (name.surname@univ-reims.fr, University of Reims)
duration: 2014 - 2018
external source: DFG
The central topics of the workshop will be on: Assemblies of nanoscale objects, many-body interactions between building blocks in such assemblies, and resulting optical and electronic properties. This workshop on interacting nanosystems will bring together theoreticians and experimentalists in the fields of materials physics and chemistry and let them interact and exchange ideas.
Topics include
- Random, amorphous, and ordered assemblies of nanocrystal, nanocomposites and nanomaterials that demonstrate both classical and quantum properties
- Novel two-dimensional atomically-thin systems: chemistry, physics, electronics and optics
- Modern inorganic aerogels and their unusual properties
- Plasmonics, photonics and optics of nanocrystal bio-assemblies
- Dynamics of collective and many-body excitations in nanoscale systems
- Hot plasmonic electrons and other novel quantum phenomena in metal and hybrid nanostructures
- Potential applications and device ideas
duration: 2018
external source: DFG
duration: 2018
external source: contract research
Development of new efficient solar cells is one of the hottest topic of modern material science and technology. The aim of project is to develop strategies for mild and "green" synthesis of ternary chalcopyrite and quatemary kesterite nanocrystals as visible-light-sensitive active components of the semiconductor nanocrystal-based solar cells.
duration: 2016 - 2018
external source: EU (Marie-Sklodowska-Actions)
grant holder: Dr. Stroyuk
duration: 2016 - 2017
external source: contract research
This project will combine the longstanding and complementary expertise on optical studies of nanostructures in the near-infrared spectral range of the group in Dresden with tasks in chemical synthesis and structural characterization of heterostructured colloidal nanoparticles and of the group in Hong Kong aimed on elucidating the relates energy/charge transfer mechanism.
The primary objectives are to develop IR emitting materials with desired photophysical properties. The optical measurements and characterization will provide feedback to optimize the nanostructures and to improve their light emitting characteristics and stability, which is a prerequisite for the design of superior light-emitting systems.
duration: 2015 - 2016
external source: DAAD
Aim:
- to develop low-toxic colloidal copper chalcogenide based quantum dots (QDs) with tunable size, composition and shape, and exhibiting photoluminescence (PL) extended over the whole near infrared (NIR) spectral region (700‒2500 nm) with high quantum yields reaching 80%;
- to design hybrid PL-localized surface plasmon resonance (LSPR) systems based on these QDs and plasmonic copper chalcogenide nanocrystals (NCs) with controllable exciton dynamics.
Motivation: whilst the visible range is completely covered by various QDs possessing quite efficient light absorption and fluorescence characteristics, the NIR active materials are limited by PbA (A = S, Se, Te), InAs, Cd3P2, CdHgTe, and HgTe. As all these compounds contain toxic elements, their potential technological applications face serious restrictions. A valuable alternative is copper chalcogenide-based ternary and quaternary QDs, such as CuIn(Zn)S(Se). However, the range of light absorption/emission of these QDs is limited to ca. 1200 nm, i.e. the currently emerging CuInS(Se) QDs, fluorescing farther in the NIR are not developed yet. This is exactly where the present project aims to bring a major contribution. Furthermore, these low-toxic QDs exhibit complex exciton dynamics which can be used as an additional handle to tune their photophysical properties. One of the means for this tuning is the interaction of excitons formed in QDs with electromagnetic field generated by materials exhibiting a strong LSPR. This coupling has been demonstrated to result either in the PL quenching or enhancement. Although this interaction has already been investigated in the visible region, it remains still unexplored for the NIR spectral range. Such investigation of the coupling of NIR luminescing QDs and appropriate NIR plasmonic nanomaterials constitutes the second major part of the project.
Objectives: to develop new synthetic approaches to CuIn(Zn)Se(Te) QDs, based on cation exchange reactions; to enhance their stability and improve their optical properties via ZnS or ZnSe shelling; to design hybrid structures combining the NIR PL QDs with NIR plasmonic Cu2‒xA NCs with well controlled distance between them; to study the interactions between excitons and plasmons in the NIR region aiming at a PL enhancement and acceleration of the exciton recombination.
Implementation: work program of the project is divided into four work packages relative to each objective. Each of them includes detailed tasks precisely assigned to two doctoral researchers.
Potential Impact: innovative optoelectronic materials and structures with tunable photophysical properties, which will be developed, are very promising candidates for applications in bio-imaging, multiphoton imaging, fluorescence-lifetime imaging microscopy, photovoltaics, nanophotonics, solar concentrators, and sensing.
project leader: Dr. Vladimir Lesnyak
duration: 2018-2021
external source: DFG GEPRIS
In the last decade the generation of movement at the microscale has evolved to a fascinating new field that connects several fields of modern science. Micro- and nanomotors are novel devices which can transform energy into movement, in conditions dominated by viscosity and Brownian diffusion. Unlike large scale engines that rely widely on inertia, the movement of objects at the microscale requires a constant energy input, but the on-board carriage of fuel is strongly restricted. The scope of this proposal is to develop a light based motion mechanism relying on water as non-toxic fuel in presence of a photocatalyst and sunlight as a renewable energy source. Nowadays the use of "solar fuels" is currently still restricted by the lack of a highly productive photocatalyst, which we aim at developing within this Freigeist project. In the subsequent step those photocatalysts have to be assembled to actual microswimmers.
This proposal connects the two innovative fields of photocatalysts and nanomotors to open new horizons for the use of such nanomotors driven by renewable energy in several environmental and analytical applications.
project leader: Dr. Julianne Simmchen
duration: 2016 - 2023
external source: foundation Volkswagenstiftung Project data
duration: 2010 - 2016
external source: DFG
The joint research project NanoPOP aims at strategy development for resource efficient utilization of recycled and recyclable noble metals. Utilized as dehalogenation catalysts, persistent water pollutants can be effectively rendered harmless. The contribution of Technische Universität Dresden to the project therein focuses on once, the characterization of biologically and chemically synthesized Pd and Pd/Fe hybrid catalysts, but also covers the chemical synthesis of Pd/Fe-hybrids. Especially the latter are important as reference catalysts. Concerning the material efficiency, recyclability, long-time persistence and the protection of the nanoparticles by hydrophobic layers are in the fore.
duration: 2013 - 2016
external source: BMBF
duration: 2016 - 2019
external source: TU Zukunftskonzept
The central themes of the Workshop were the physical and chemical properties of nanoscale assemblies. This is nowadays an extremely "hot" field of research, due to both new fundamental physics and applications. During the Workshop, young scientists were presenting their results in short talks and posters. For some of the young participants, this was the first chance to meet with many well-established scientists from the field.
duration: 2012
external source: DFG
This project was conducted in collaboration with IAPP, TU Dresden (group of Dr. Lars Müller-Meskamp) and Heliatek company. New transparent metallic nanowire (silver, copper) network electrodes for organic solar cells were successful investigated and enhanced.
external source: BMWI
The collaboration between two groups in Dresden and Hong Kong which posses complementary expertise in the fabrication of gels and aerogels based on strongly emitting seminconductor nanocrystals and in advanced optical characterization of nanostructured materials, e.g. nanowires and nanowires-based nanocomposites will allow to establish key optoelectronic parameters, e.g. carrier transport rates and energy transfer efficiency in the gel- and aerogel-based materials necessary for their utilizaton as building blocks for energy harvesting or for lighting applications.
duration: 2011 - 2012
external source: DAAD
At this international meeting scientists and developers from different areas of the Oberflächenwissenschaften have jointly discussed. The electrochemical coating was presented with various areas, mainly presented by the electrical cristalization and its control system as the comprehensive topic. The lectures from the area of the vacuum coating (PVD, CVD) were completed with lectures from the area of Schichtbildung aus kolloiden Partikeln. So you could find a large field of possible functionalization, especially in the plenary sessions.
duration: 2010
external source: DFG
Quantum dots (QD) are representatives of a new class of nanomaterials. These materials in general and semiconductor nanoparticles in particular are promising candidates bearing novel properties for applications in engineering and medicine. Little is known yet about the interaction of this novel class of materials with biological systems and the safety aspects arising from these interactions.rnOne goal in medical applications of nanoparticles is their use as tools to either label special cells or deliver drugs to particular tissues. Therefore, they are likely to affect cellular processes including those mediating uptake, intracellular storage of processing and degradation of extracellular materials. Nanoparticles are expected to interact with the cellular machinery at the level of their physical dimensions being in the size range of biological macromolecules. The intracellular fate of the nanoparticles will determine their specific toxicity. rnSince the surface of the particles determines the cellular interactioin and subsequently its intracellular pathway we are going to study hydrophilic and hydrophobic semiconductor QDs with respect to their interaction with liver and adipose cells. Both tissues are characterised by a special metabolic activity and both are of potential relevance in storage of the respective nanomaterials. Therefore, they are expected to be a relevant model system.
duration: 2008 - 2010
external source: DFG
Lead chalcogenide nanocrystals will be probed using photons whose energies are multiples of the bandgap and the materials investigated for the presence of multiple excitons. This will be undertaken for a number of sizes of nanocrystals and the results modeled to gain greater understanding of the mechanisms involved.
duration: 2008 - 2010
external source: DFG
Fabrication and characterization of functional metallic and mixed metal – semiconductor nanocrystal aerogels.
duration: 2009 - 2011
external source: DFG
"Colloidally Synthesized Semiconductor Nanocrystals and their Förster Resonance Energy Transfer for Solid State Lighting Applications", bilaterial cooperation with Bilkent University TurkeyrnThis project proposes controlled Förster type nonradiative resonant energy transfer to be utilized in layer-by-layer assembled, colloidally synthesized semiconductor quantum dot nanocrystal solids for solid state lighting applications. This mechanism will provide a solution to the first aforementioned problem by increasing the emission efficiency of the nanocrystal solids for solid state lighting applications. This relies on increasing the emission probability of the excitons funneled by the energy transfer, which would otherwise encounter nonradiative recombination. As Förster energy transfer is based on the dipole-dipole interaction, the distance between the dipole emitters in short range (in 1-10 nm) is rather crucial for this mechanism to take place efficiently. The average distance between the nanocrystal solids can conveniently be controlled by changing the nanocrystal concentration in their blended mixtures and also very precisely by arranging multiple spacer layers of the intermediate polyelectrolyte film (with each layer of 0.5 nm in thickness) in their layered architectures. Therefore, for the solution of the second problem, after the nanocrystals are synthesized (and thus after their size is fixed during the synthesis ), by controlling the average distance between the nanocrystal emitters in blends or layers, it is possible to control the efficiency of energy transfer between them and thus the resulting emission properties including chromaticity of the ensemble nanocrystals. By this way, after the synthesis of the individual nanocrystals, their collective emission characteristics in the solid film can be tuned to obtain the desired operating choramaticity. In accordance with these purposes, our project outcomes include the synthesis of nanocrystals, their layer by layer assembly in thin films and control of energy transfer between them.
duration: 2009 - 2012
external source: BMBF
INNOVASOL aims at developing radically new nanostructured and molecular materials for the production of innovative solar cells, moving towards photovoltaic excitonic solar cells really competitive with traditional energy sources. more...
duration: 2009 - 2012
external source: EU
Electrochemical and spectroelectrochemical investigations of a wide variety of colloidal semiconductor nanocrystals prepared both in aqueous media and in organic solution are to be performed with the aim of establishing their “potential windows of stabilityâ€, probing and prediction of the formation of surface states, and establishing the absolute positions of their energy levels. Energy diagrams of the nanocrystals investigated will be created which will contribute to the understanding of the fundamental properties of semiconductor nanomaterials and their size-dependent (quantum-confinement) properties. The data obtained are of special importance for the prediction of the stability of the nanocrystals in biological environments (bio-imaging and bio-labelling) as well as for a precise designing of composite nanoheterostructures for optoelectronic (light-emitting diodes) and photovoltaic (solar cells) applications. Detailed measurement protocols will be prepared to make the methods developed easily applicable, universal and thus attractive for other research and industrial groups dealing with nanotechnology based on semiconductor nanocrystals.
duration: 2010 - 2013
external source: DFG
This project aims to synthesise, and characterise by optical and optoelectrochemical methods, monodisperse nanoparticles of the nontoxic semiconducting material tin (II) sulfide. Initially the synthetic strategies required to produce emitting material will be sought via coating and/or post-treatments. Further the effects of different combinations of ligand sets on the size and resulting particle geometries will be investigated. The nanoparticles will then be phase transferred from the parent organic solution to aqueous solution and the stability of the material in both phases compared. The conditions and linking molecules through which the resulting tin (II) sulfide nanoparticles may be attached to both metallic and transparent oxide substrates and further used as electrode substrates will be found. The materials will subsequently be characterised for their optical response, both at the solid/air and solid/liquid interfaces as well as in solution, using absorbance spectroscopy, emission spectroscopy (standard static emission and PLE), and time resolved emission spectroscopy. The tin (II) sulfide derivatised electrodes will be interrogated using a suite of optoelectrochemical techniques in order to determine the absolute band positions and therefore optoelectrochemical bandgap as well as determine the kinetics of the charge transfer processes with respect to the applied potential. All of these characterisations will be applied to a range of nanoparticle sizes in order to gauge the effect of quantum confinement on this system. Finally the application of the experience gained to the synthesis of nanoparticles of another allotrope of SnS previously reported in the literature will be attempted.
duration: 2010 - 2013
external source: DFG
The goal of the current application is to investigate in vivo the interaction, processing and degradation of nanocrystals as well as the specific cellular response to these interactions after injection of nanocrystals in mice. The outcome of these results will not only provide in depth insights into potential hazards associated with unintended exposure of nanocrystals but will also greatly influence the potential use of nanocrystals for biomedical applications.
duration: 2011 - 2013
external source: DFG
duration:
external source: EU/ESF
The overall goal here is to derive correlations between the key parameter QY (quantum yields) and the surface composition of these QDs (quantum dots), thereby also exploiting time-resolved spectroscopic studies. The obtained results will enable not only the design and preparation of highly emissive NIR and IR QDs, yet they will allow also the prediction of the applicability of these QDs.
duration: 2011 - 2014
external source: DFG
The Nanophotonics for Energy Efficiency project aims to create a virtual centre of excellence to re-orient and focus nanophotonics research towards the challenges in energy efficient applications. The network will cluster nanophotonic laboratories and research groups in Europe combining their expertise in the development of disruptive approaches to lighting and solar cell technology. The consortium consolidates know-how and resources of 9 different institutions in 6 European countries with complimentary research and development expertise, integrating more than 130 scientists, engineers, technicians and managers in nanophotonics. The project pursues a scientific bottom-up approach to ensure that novel ideas and scientific breakthroughs as well as established proof-of-concepts in academia are promoted along the value chain towards reaching their eventual goal of commercialization. Market and industrial relevance is ensured through the involvement of industry leaders in the Advisory Board. more...
duration: 2010 - 2015
external source: EU
The workshop aims to cover cutting-edge research in the field of nanoscale physics with a focus on the physical and chemical properties of assemblies composed of nano-crystals, molecules, bio-molecules and polymers. One of the central ideas of the workshop is to bring together theoreticians and experimentalists and let them interact and exchange ideas. The topics to be addressed in the workshop will include, but not be limited to:
- Strategies and technologies of nano-assembly leading to complex geometries and novel properties
- Modern theoretical and computational approaches to complex hybrid nanoscale systems
- Migration and transfer of energy at the nanoscale, including FRET, tunneling transport and heat flow
- Optical properties of excitonic nanocrystals and their assemblies
- Plasmonic nanostructures with novel optical properties
- Hybrid structures with interacting exciton and plasmon resonances
- Coupling between molecules and nanocrystals
- Many-body effects in nanoscale systems that may control the assembly, chemistry and physical properties
- Bio-assemblies of nanocrystals based on polymers, involving DNAs, proteins and other molecules
- Schemes for functional nano-assemblies for solar energy harvesting, bio-sensing and other applications
duration: 2015
external source: DFG
TREASORES will demonstrate the production of large area organic electronics using high throughput manufacturing technologies based on roll-to-roll wet deposition processes. In particular, by developing large area transparent conducting barrier foils which will be used for the production of flexible organic light-emitting devices (OLED), light-emitting electrochemical devices (LEC) and flexible organic photovoltaics (OPV). more...
duration: 2012 - 2015
external source: EU
MindNano project is focused on the existing and international expertise in the field of DNS-Nanotechnology as well as the synthesis of nanoparticles and their surface functionalization. One of the most important aspects of the planned work is a fabrication of uniform nanostructures. The research will combine the nanoimprintings and high frequency techniques together that the science in this highly topical field and a technological breakthrough can be achieved. Moreover, within the project new methods will be developed in order to fully characterize the synthesized nanostructures. The project is intended to demonstrate that biological self-organized principles can be used to synthesize simple electronic devices such as antenna or resonators. DNA-nanotechnology is used here to generate the artificial templates with well-defined geometries and specific chemical surface properties. The work comprises the design of suitable template structures, the development of mineralization strategies as well as novel methods for the comprehensive studies of the hybrid nanostructures. further information...
duration: 2013 - 2015
external source: EU/ESF
Matter in its nanoparticulate form has gained considerable attention in recent decades due to the fascinating properties exhibited as materials, evolve from the atomic scale, through the molecular and approach the extended solid. These "size tunable" properties have the potential to impact on many interesting areas of development and applications. But the marriage of the nanoscale wortd with that of materials of macro dimensions which can be easily manipulated imd processed, whilst maintaining the nanoscale properties, is still a challenge to be surmounted. Aerogels have recently been demonstrated to provide such an opportunity. This project therefore aims at the elucidation of the potential of the class of materials based on nanoparticle derived aerogels. These materials will be produced from a variety of metal and semiconductor nanoparticles available in colloidal solutions. The evolving aerogels are extremely light, highly porous solids and have been demonstrated to possess the important properties of the nanosized objects they consist of instead of simply those of the respective bulk solids. The resulting aerogel materials will be characterized with respect to their morphology and composition and their resulting properties examined in light of the inherent electronic nature of the nanosized constituents. Using the knowledge gained within the project the aerogel materials will be further re-processed in order to achieve improvements in their properties relevant to applications in optical sensing and catalysis.
duration: 2012 - 2016
external source: DFG
This project will combine experience of the Dresden group in the synthesis of QDs and their embedding in ionic crystals with an experience of Bilkent group in modelling, fabrication and characterisation of solid state lighting systems, in particular white LEDs, based on color conversion. The cooperation will allow to continue bilateral cooperation between partners and efficient multidisciplinary training of young researches from both partner groups.
duration: 2013 - 2016
external source: BMBF
The project aims at developing new concepts, materials and devices for the efficient conversion of the solar energy flux to electrical power. The basic idea is to use new and advanced concepts of light management in order to harvest a large fraction of solar energy and convert it to electricity, through photovoltaic/thermoelectric integrated devices. more...
duration: 2013 - 2016
external source: EU
AEROCAT aims at the elucidation of the potential of nanoparticle derived aerogels in catalytic applications. The materials will be produced from a variety of nanoparticles available in colloidal solutions, amongst which are metals and metal oxides. The evolving aerogels are extremely light, highly porous solids and have been demonstrated to exhibit in many cases the important properties of the nanosized objects they consist of instead of simply those of the respective bulk solids. The resulting aerogel materials will be characterized with respect to their morphology and composition and their resulting (electro-)catalytic properties examined in the light of the inherent electronic nature of the nanosized constituents. Using the knowledge gained within the project the aerogel materials will be further re-processed in order to exploit their full potential relevant to catalysis and electrocatalysis.
duration: 2014 - 2019
external source: ERC (advanced grant)/EU
grant holder:
Prof. Eychmüller
ERC-grant no 340419
The establishment of the Collaborative Research Center (SFB) is a long-term and complex process, which requires a very good networking of the subprojects. With this pilot project we want to increase the chances of a successful SFB application. further information...
project partner:
Prof. Brunner/Bioanalytische Chemie
Prof. Seifet/Theoretische Chemie
Prof. Kaskel/Anorganische Chemie I
duration: 01.08.2013 - 31.03.2017
external source: TU Dresden/DFG
duration: 2012 - 2018
external source: DFG