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Issue 3, 2013
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Positive piezoresistive behavior of electrically conductive alkyl-functionalized graphene/polydimethylsilicone nanocomposites†

Yi Hou,ab   Dongrui Wang,*a   Xiao-Man Zhang,a   Hang Zhao,b   Jun-Wei Zhaa  and  Zhi-Min Dang*abc  
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* Corresponding authors

a Department of Polymer Science and Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
E-mail: dangzm@ustb.edu.cn, wangdr@ustb.edu.cn

b Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, P. R. China

c State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, P. R. China

Abstract

Piezoresistive nanocomposites using alkyl-functionalized graphene (G-ODA) as a conducting filler and polydimethylsilicone (PDMS) as the polymer matrix were prepared and their piezoresistivity behavior was investigated. One-pot synthesis of G-ODA from graphite oxide and octadecylamine improved its dispersion in nonpolar xylene and PDMS with low surface free energy. Results show that the graphene nanosheets were homogeneously dispersed in the PDMS matrix and an ultra-low percolation threshold (0.63 vol%) of the composites was obtained. The G-ODA/PDMS composites with 1.19 vol% content of G-ODA show a remarkable positive piezoresistivity of high sensitivity (R/R0 > 400 under the pressure of 1.2 MPa), excellent repeatability, small hysteresis, and long-term durability. Under uniaxial compression, the resistance of the composites exponentially increased with the pressure. The resistance–pressure curves remain nearly unchanged after 1000 loading–unloading cycles. The results suggest that the G-ODA/PDMS nanocomposites provide a new route toward fabrication of soft piezoresistive sensors with high performance.

Graphical abstract: Positive piezoresistive behavior of electrically conductive alkyl-functionalized graphene/polydimethylsilicone nanocomposites

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Article information

https://doi.org/10.1039/C2TC00114D
Submitted
04 Sep 2012
Accepted
24 Oct 2012
First published
24 Oct 2012
J. Mater. Chem. C, 2013,1, 515-521
Article type
Paper
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Positive piezoresistive behavior of electrically conductive alkyl-functionalized graphene/polydimethylsilicone nanocomposites

Y. Hou, D. Wang, X. Zhang, H. Zhao, J. Zha and Z. Dang, J. Mater. Chem. C, 2013, 1, 515
DOI: 10.1039/C2TC00114D

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