Flexible and highly sensitive graphene/carboxymethyl cellulose films for bending sensing
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Flexible and highly sensitive graphene/carboxymethyl cellulose films for bending sensing Ping Liu1 · Minggan Chen1 · Canguang Xiong1 · Xiuhua Cao2 · Hui Wang1 Received: 24 December 2019 / Accepted: 8 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High sensitivity is the major desired requirements of strain sensors for wearable electronics applications, especially in health and medical monitoring. A bending sensor attach tightly to skin remains a hot topic considering wide response range and high sensitivity. Herein, a highly sensitive strain sensor based on graphene/carboxymethyl cellulose (GE/CMC) composite film is fabricated through vacuum filtration and chemical reduction. CE/CMC films present an ordered multi-layer structure, which is helpful for signal sensitivity. Owing to the super flexibility of carboxymethyl and the excellent electrical and mechanical properties of GE, the free-standing GE/CMC film reveals high conductivity at 1321.9 S m−1, good response performance at low voltage driving of 1 mV. The bending signal of GE/CMC film was stable, when applying 0–90° forward bending strain. Its sensitivity reaches at 0.83 rad−1, and response time of 90° forward bending strain is less than 190 ms, with a regularly stable bending signal response in 100 cycles bending testing. With such outstanding performances, the GE/CMC film can be expected to be applied in motion signal detection.
1 Introduction Strain sensors are becoming increasingly popular because of their wide potential applications in areas including human motion detection, health monitoring and human–machine interaction [1, 2]. In general, strain sensors can convert mechanical deformation signals to electrical signals owing Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10854-020-03966-8) contains supplementary material, which is available to authorized users. * Hui Wang [email protected] Ping Liu [email protected] Minggan Chen [email protected] Canguang Xiong [email protected] Xiuhua Cao caoxh@china‑fenghua.com 1
College of Materials Science & Engineering, South China University of Technology, Guangzhou 510640, China
State Key Laboratory of Advanced Materials and Electronic Components, Guangdong Fenghua Advanced Technology Holding Co., Ltd., Zhaoing 526020, China
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to the capacitive [3], piezoelectric and piezoresistive effect [4–6]. Wearable strain sensors for health monitoring [7], joint motion [8], robots [9] etc. possess many features such as good tensile properties, continuous monitoring, flexibility, stability, and portability. Traditional strain sensors use metallic materials or semiconductor materials as sensitive layers, which are difficult to meet the needs of highly flexibility and complex three-dimensional strain measurement. To date, conductive composites have aroused considerable concern out of excellent flexibility, low cost, and good processability. These composites are hopeful use as candidates for strain sensing materials [10,
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