Piezoresistive characterization of multi-walled carbon nanotube-epoxy based flexible strain sensitive films by impedance spectroscopy

被引：116

作者：

Sanli, Abdulkadir ^{[1
]}

Mueller, Christian ^{[1
]}

Kanoun, Olfa ^{[1
]}

Elibol, Cagatay ^{[2
]}

Wagner, Martin F. -X. ^{[2
]}

机构：

[1] Tech Univ Chemnitz, Chair Measurements & Sensor Technol, Reichenhainer Str 70, D-09126 Chemnitz, Germany

[2] Tech Univ Chemnitz, Mat Engn Grp, Erfenschlager Str 73, D-09125 Chemnitz, Germany

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2016年 / 122卷

关键词：

Carbon nanotubes; Strain sensing; Smart material; Electrical properties; Nanocomposite; INDUCED TUNNELING CONDUCTION; THIN-FILM; COMPOSITES; SENSOR; FABRICATION;

D O I：

10.1016/j.compscitech.2015.11.012

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

In this study, we investigate the piezoresistive properties of flexible, strain sensitive multi-walled carbon nanotubes (MWCNTs)/epoxy composites. The deformation over the sensor area was tested by digital image correlation (DIC) under quasi-static uniaxial tension. The piezoresistive characteristics of the films were investigated quantitatively by electrochemical impedance spectroscopy (EIS) over a wide range of frequencies from 40 Hz to 110 MHz. Scanning electron microscopy (SEM) images confirmed that MWCNTs/epoxy composites with different CNT concentrations have a good homogeneity and dispersion. Additionally, in order to tailor the piezoresistivity of the strain sensor, an RC equivalent circuit was derived based on the impedance responses and the corresponding parameters were extracted under tensile strain. Compared with traditional strain gauges, higher sensitivity is obtained in particular at the concentrations close to the percolation threshold (13.6 for 03 wt.%). Due to the tunneling effect, a non-linear piezoresistivity is observed at low concentrations. It was found that sensors with 1 wt.% shows the highest linearity with a correlation coefficient of 0.999. The standard deviation of the cyclic readings was found to be 0.05%, indicating a high repeatability. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：18 / 26

页数：9

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