Enhancing the sensitivity of graphene/polyurethane nanocomposite flexible piezo-resistive pressure sensors with magnetite nano-spacers

T. T. Tung, C. Robert, M. Castro, J. F. Feller, T. Y. Kim, Kwang Suck Suh

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

A robust piezo-resistive nanocomposite flexible sensor has been developed using an innovative combination of materials, i.e., magnetite-decorated graphene/poly(ionic liquid) compatibilized poly(urethane) (TPU/Fe3O4@RGO-PIL). The transducer has been fabricated by spray layer by layer (sLbL) to structure an original three-dimensional architecture in which: reduced graphene oxide (RGO) platelets are used to build the conducting network, PIL stabilizes this percolated assembly, Fe3O4 NP act as nano-spacers between platelets to prevent their stacking and facilitate their switching, and TPU matrix brings cohesion and flexibility to the whole assembly. This strategy results in highly sensitive TPU/Fe3O4@RGO-PIL flexible nanocomposite sensors (high gauge factor in pure compression up to 6.2, exceptionally low threshold pressure 0.5 kPa, Negative Pressure Coefficient), yielding a linear response in a large range of pressures (10–200 kPa), with robust and reproducible piezo-resistive properties (weak hysteresis upon loading unloading cycling, stability of signals up to 100 000 cycles, with 2 ms dephasing). These performances are promising for a variety of applications in flexible and wearable electronics, such as tactile sensors, sensing skins and compressive strain sensors.

Original languageEnglish
Pages (from-to)450-460
Number of pages11
JournalCarbon
Volume108
DOIs
Publication statusPublished - 2016 Nov 1

ASJC Scopus subject areas

  • Chemistry(all)

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