Piezoresistive Behavior Study on Finger‐Sensing Silicone Rubber/Graphite Nanosheet Nanocomposites

Abstract

A novel finger‐sensing nanocomposite with remarkable and reversible piezoresistivity is successfully fabricated by dispersing homogeneously conductive graphite nanosheets (GNs) in a silicone rubber (SR) matrix. Because of the high aspect ratio of the graphite nanosheets, the nanocomposite displays a very low percolation threshold. The SR/GN nanocomposite with a volume fraction of conductive nanosheets closest to that for the percolation threshold presents a sharp positive‐pressure coefficient effect of the resistivity under very low pressure, namely, in the finger‐pressure range (0.3–0.7 MPa), whereby the abrupt transition could be attributed to compressive‐stress‐induced deformation of the conducting network. The super‐sensitive piezoresistive behavior of the nanocomposite is accounted for by an extension of the tunneling conduction theory which provides a good approximation to the piezoresistive effect.

Development and characterization of piezoresistive porous TPU-MWNT nanocomposites

“…These advantages make them potential sensing elements for applications requiring compliant materials such as electronictextiles, artificial skins and other large deformation measurements [7]. Several recent studies have investigated the piezoresistance of conductive nanoparticle composites [8][9][10][11][12] Investigations by Knite et al [13] and by Wichmann et al [14] have compared the strain sensing capability between carbon black and MWNT in poly(isoprene) composites.…”

Influence of ionic liquids on the dielectric relaxation behavior of CNT based elastomer nanocomposites

“…Polymer nano-composites can have a remarkable piezoresistivity [2,3]. Such materials are good candidates to be used as sensors with high sensitivity [4]. For example, a piezo-resistive rubber sensor vulcanized into the sidewall of a tire can monitor the actual state of a tire such as the tire pressure to a control system.…”

Production of Graphite Nanosheets by Low-Current Plasma Discharge in Liquid Ethanol

“…At the time of writing, carbon nanosheets are being considered as electrode materials and catalyst supports in electrochemical supercapacitors and fuel cells, 8,9) lithium-ion batteries 10,11) and in field emission 5,12) perfomance, and as filler in polymer composites. 13,14) In graphite nanosheets, the weak van der Waals bonding between adjacent graphene layers make them promising candidates for exfoliation into single-graphene sheets. The synthesis of graphite nanosheets and single-graphene sheets has been previously demonstrated by using radio-frequency or microwave plasma-enhanced chemical vapor deposition (PECVD), [4][5][6][7] arc-discharge methods, 15,16) chemical reduction of exfoliated graphite oxide 17,18) and a solvothermal synthesis.…”