Printed graphene/WS2 battery-free wireless photosensor on papers

Screen-printed graphene near field communication (NFC) tag antenna is integrated with inkjetprinted WS2 photodetector on paper substrate to fabricate battery-free wireless photosensor. Asequential multi-stack printing is employed for the wireless photosensor fabrication: the NFC tagantenna is first screen-printed with graphene conductive ink and then the photodetector is inkjetprinted with transition metal dichalcogenides (TMDs) WS2 ink as photoactive component. Highresponsivity and sensitivity are observed for the WS2 photodetector, which acts as photoactivethermistor of the NFC sensor IC chip. The highly conductive graphene nanoflakes ink enablesthe screen-printed graphene NFC tag antenna to withdraw sufficient power wirelessly from thereader to power the sensor IC chip. This work demonstrates a prospective approach to manufacture2D materials enabled electronics where the electronic circuits (normally having a large size) canbe realized by mass production screen printing and the sensing component (normally having asmall size) can be produced by inkjet printing, enabling low cost and simple fabrication methods,compatible with flexible substrates such as paper.