Highly Sensitive Bendable and Foldable Paper Sensors\nBased on Reduced Graphene Oxide

Abstract

Over\nthe past decade, the demand for high-performance wearable sensors\nhas increased because of their capability for interaction with humans.\nSuch sensors have typically been prepared on conventional substrates,\nsuch as silicon, PDMS, and copper mesh. In this work, we propose a\nclass of wearable sensors fabricated from reduced graphene oxide (rGO)\npatterned paper substrates (rGO-paper). These rGO-paper sensors are\nhighly sensitive to various deformations and capable of measuring\nbending and folding angles as small as 0.2° and 0.1°, respectively.\nWe have demonstrated the applicability of these high-performance rGO-paper\nsensors by patterning rGO on kirigamis that can detect pulse and the\nmotion of knees, wrists, and fingers. Finally, paper rings lined with\nrGO sensors were used to control a robotic hand, and an rGO-paper\nkeyboard was used to light LEDs.