NEW NANO-TATTOOS DON'T NEED BATTERIES OR WIRES

Summary from the TLDR newsletter

Researchers from Istanbul have created nanotattoos capable of passive wireless communications with nearby devices without the need for an external power source. Backscattering-based nanotattoo sensor (BNTS) tattoos are made by painting a zinc oxide ink containing embedded nanowires on top of a graphene aerogel conductive ink using separate needles. As the tattoos change shape, they convert mechanical energy into electrical energy. Data from the tattoos can be extracted using a smartphone. The tattoos can be placed on any surface, not just on the human body.