Mechanosensation Active Matrix Based on Direct-Contact Tribotronic Planar Graphene Transistors Array.

Mechanosensation Active Matrix Based on Direct-Contact Tribotronic Planar Graphene Transistors Array.

ACS Nano. 2018 Sep 05;:

Authors: Meng Y, Zhao J, Yang X, Zhao C, Qin S, Cho JH, Zhang C, Sun Q, Wang ZL

Abstract
Mechnosensation electronics aims at replicating the multi-functions of human skin to realize quantitative conversion of external stimuli into electronic signals and provide corresponding feedback instructions. Here, we report a mechanosensation active matrix based on direct-contact tribotronic planar graphene transistors array. Ion gel is utilized as both dielectric in graphene transistor and friction layer for triboelectric potential coupling to achieve highly efficient gating and sensation properties. Different contact distances between the ion gel and other friction materials produce different triboelectric potentials, which are directly coupled to graphene channel and lead to different output signals through modulating the Fermi level of graphene. Based on this mechanism, the tribotronic graphene transistor is capable of sensing approaching distances, recognizing category of different materials and even distinguishing voices. It represents excellent sensing properties, including high sensitivity (0.16 mm-1), fast response time (~ 30 ms) and excellent durability (over 1000 cycles test). Furthermore, the fabricated mechanosensation active matrix are demonstrated to sense spatial contact distances and visualize a 2D color mapping of the target object. The tribotronic active matrix with ion gel as dielectric/friction layer provides a new route for efficient and low-power-consuming mechanosensation in noninvasive fashion. It is of great significance in multifunction sensory systems, wearable human-machine interactive interface, artificial electronic skin and future telemedicine for patient surveillance.

PMID: 30183252 [PubMed - as supplied by publisher]