High-performance flexible piezoresistive strain sensor based on biaxially stretched conductive polymer composite films with reduced graphene oxide-carbon nanotubes

XIANG Dong; ZHANG Xuezhong; CHEN Xiaoyu; WU Yuanpeng; YE Yong; ZHANG Jie; ZHAO Chunxia; LI Yuntao; WANG Junjie

doi:10.13801/j.cnki.fhclxb.20210623.001

Volume 39 Issue 3

Mar. 2021

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Article Navigation > Acta Materiae Compositae Sinica > 2022 > 39(3): 1120-1130

XIANG Dong, ZHANG Xuezhong, CHEN Xiaoyu, et al. High-performance flexible piezoresistive strain sensor based on biaxially stretched conductive polymer composite films with reduced graphene oxide-carbon nanotubes[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1120-1130. doi: 10.13801/j.cnki.fhclxb.20210623.001

Citation:

XIANG Dong, ZHANG Xuezhong, CHEN Xiaoyu, et al. High-performance flexible piezoresistive strain sensor based on biaxially stretched conductive polymer composite films with reduced graphene oxide-carbon nanotubes[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1120-1130. doi: 10.13801/j.cnki.fhclxb.20210623.001

Citation:

XIANG Dong, ZHANG Xuezhong, CHEN Xiaoyu, et al. High-performance flexible piezoresistive strain sensor based on biaxially stretched conductive polymer composite films with reduced graphene oxide-carbon nanotubes[J]. Acta Materiae Compositae Sinica, 2022, 39(3): 1120-1130. doi: 10.13801/j.cnki.fhclxb.20210623.001

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High-performance flexible piezoresistive strain sensor based on biaxially stretched conductive polymer composite films with reduced graphene oxide-carbon nanotubes

doi: 10.13801/j.cnki.fhclxb.20210623.001

1.
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
2.
School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
3.
School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China
4.
Department of Civil Engineering, Tsinghua University, Beijing 100091, China

Received Date: 2021-04-01
Accepted Date: 2021-06-15
Rev Recd Date: 2021-05-23

Available Online: 2021-06-23

Publish Date: 2021-03-01

Abstract

Abstract

In recent years, flexible piezoresistive sensors have shown great application potential in human health monitoring, smart robots, wearable electronic devices, and human-computer interaction, while it is challenging to efficiently fabricate highly sensitive and low-cost flexible piezoresistive sensor for detecting micro strains. In this work, reduced graphene oxide (rGO) was prepared by Hummer's method, then carbon nanotubes (CNTs) were immobilized on the surface of rGO by electrostatic assembly. Subsequently, the hybrid nanofillers were introduced into thermoplastic polyurethane (TPU) matrix to prepare conductive polymer composite. The further dispersion and parallel orientation of nanofillers in the matrix were achieved by the sequential biaxial stretching process. It is shown that the sensor prepared by biaxially stretched conductive polymer composite exhibits higher sensing performance compared to the sensor without experiencing biaxial stretching. The rGO-CNT/TPU_4×4 sensor (with a stretching ratio of 4×4) shows high sensitivity (G_F=46.7 at 1.5% strain), high linearity (R²=0.98), responsive capability to different strains and frequencies, excellent stability and repeatability in cyclic loading tests. The flexible piezoresistive sensor can be used to identify subtle human physiological activities, including pulse and exhalation. In addition, a compressible sensor array was fabricated to achieve accurate identification of weight distribution. This study provides an important scientific guidance for the rapid large-scale fabrication and structure and property tuning of high-performance flexible piezoresistive strain sensors.
- biaxial stretching,
- strain sensor,
- self-assembly,
- reduced graphene oxide,
- carbon nanotube
Long Abstrsct
Innovation Points

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References(35)

References

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