A Precursor-derived Ultramicropo­rous Carbon for Printing Iontronic Logic Gates and Super-Varactors

We present a novel 3D printed in-plane capacitive analogue of semiconductor-based diodes (CAPode) based on the selective ion-sieving effect depending on the ion size. Two printing techniques together with suitable and fine-tuned inks are explored to fabricate different interdigital electrode structures: one ultramicroporous and mesoporous carbon. The miniaturized devices are successfully utilized in logic gates operations (‘AND’, ‘OR’) and for the first time tested as variable capacitor in a high-pass filter application.

https://onlinelibrary.wiley.com/doi/epdf/10.1002/adma.202401336