Fabrication of graphene/free-standing nanofibrillar PEDOT/P(VDF-HFP) hybrid device for wearable and sensitive electronic skin application

In this work, we describe a simple method for the fabrication of a new class of graphene/free-standing nanofibrillar PEDOT/P(VDF-HFP) nanohybrid E-skin device. This E-skin exhibits enhanced contact surface area and piezo-resistivity with an extremely high gauge factor (320) under tensile strain, which combine to yield very high sensitivity to pressure (limit of detection = 0.5 Pa). Signals from even very weak motion, such as changes in facial expression and the pulse in the wrist, can be detected. Furthermore, this E-skin is sufficiently durable and reproducible. The E-skin device does not exhibit measurable changes in performance or observable signs of physical deterioration, even after over 1000 strain cycles, and is wearable and sufficiently biocompatible to be placed inside clothing or against human skin without causing irritation. (C) 2015 Elsevier Ltd. All rights reserved.