Journal Article 7782-42-5 Graphite Research Support, Non-U.S. Gov't electronic skin triboelectric nanogenerators 2D materials 63148-62-9 Dimethylpolysiloxanes Retracted Publication Retraction Notice Review UV and light sensors active matrix baysilon biosensors coplanar gate graphene transistor doping effect electrical double layers flexible electronics graphene graphene transistors high sensitivity humidity sensor ion-gel-gated MoS2 transistors low power molybdenum disulfide multimodal sensors pH and ion sensors physical adsorption