Graphene Tribotronics for Electronic Skin and Touch Screen Applications

Abstract

Graphene tribotronics is introduced for touch-sensing applications such as electronic skins and touch screens. The devices are based on a coplanar coupling of triboelectrification and current transport in graphene transistors. The touch sensors are ultrasensitive, fast, and stable. Furthermore, they are transparent and flexible, and can spatially map touch stimuli such as movement of a ball, multi-touch, etc.

Perceptual Surgical Knife with Wavelet Denoising

“…Different FET sensors have been proposed with distinguished materials, for example, ZnO nanorods with a high sensitivity of 1.6 mA/($\mathsf{\mu }$M·cm${}^2$) for continuous glucose monitoring [12], enzyme-catalyzing-based FET sensors with a sensitivity of $10$ mM and Nernstian response of 59.2 mV/decade [13], and ionic liquids with a pressure sensitivity of $2.2\times {10}^3$ kPa${}^{-1}$ [14]. Currently, FET-based bio-inspired electronic skins are being developed in the literature, such as nanowire FET-based robotic tactile sensing skins [15], and graphene tribotronic transistor-based artificial skins [16]. The purpose of this work is to design a perceptual surgical knife to detect the electrons or electric field in the human body by using the principle of FETs.…”

Nanomaterial‐Enabled Wearable Sensors for Healthcare

“…In a representative work, a pressureresponsive triboelectric nanogenerator was used to gate the graphene based transistors. [161] Such graphene tribotronics showed a pressure sensitivity of ≈2% kPa −1 at pressure of 10 kPa.…”

“…[158] Copyright 2015, Royal Society of Chemistry. Besides the widely used resistive and capacitive mechanisms, progress has been made to develop wearable piezoelectric [22,58,59,159] and triboelectric [160][161][162] pressure sensors. Similar to piezoelectric strain sensors, the piezoelectric pressure sensors detect the applied pressure by measuring the accumulated electric charges.…”

“…Successful mimicking of human skin requires good mechanical compliance, high sensitivity, good spatiotemporal resolution, and multimodal sensing capability. [20] A multitude of pressure sensing arrays have been demonstrated to capture the spatial pressure distributions induced by different sources, such as a static object placed onto the sensing array, [57,139,141,158,203] gas flow, [141,144,153] bouncing of a water droplet (Figure 11a), [139] finger touch, [144,161] and acoustic vibration. [144,203] Besides the pressure sensors, strain sensors were used to detect the movement of a cricket and sound signals.…”

Theoretical Study of Sliding‐Electrification‐Gated Tribotronic Transistors and Logic Device

“…[15][16][17][18][19][20][21] A new research field of tribotronics was then opened up in 2014, [22,23] using the electrostatic potential created by TENG as a "gate" voltage to tune/control chargecarrier transport in semiconductors. Tribotronics has established a direct interactive mechanism between the external environment and electronics, and has been demonstrated for potential applications in micro/nano-electromechanical systems (MEMS/NEMS), [24] tactile sensors, [25][26][27][28] logic circuits, [29,30] organic memory devices, [31] optoelectronics, [32][33][34][35] and active modulation. [36,37] Despite these published reports, by now the theoretical studies on tribotronic transistor and logic devices are very limited.…”