Flexible electronic skin sensor based on regenerated cellulose/carbon nanotube composite films
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ORIGINAL RESEARCH
Flexible electronic skin sensor based on regenerated cellulose/carbon nanotube composite films Yuanyuan Xie . Haiyu Xu . Xianqing He . Yang Hu . Enwen Zhu . Yujiao Gao . Dongning Liu . Zhuqun Shi . Jing Li . Quanling Yang . Chuanxi Xiong
Received: 6 June 2020 / Revised: 23 September 2020 / Accepted: 27 September 2020 Ó Springer Nature B.V. 2020
Abstract Flexible and stretchable artificial electronic skin (E-skin) has attracted more and more attention in recent years. The incorporation of microstructures can effectively change the contact area and increase the sensitivity of E-skin materials to some extent, but usually require expensive micromachining methods. In this work, cellulose was dissolved in a NaOH/urea aqueous solution and compounded with carbon nanotubes (CNT) to prepare regenerated cellulose (RC) -CNT composite films. Then the microstructure was introduced onto the surface of RC-CNT composite films, and assembled the
composite films into an E-skin sensing device. The results indicated that the RC-CNT composite films possessed good flexibility, high tensile strength (61.6 MPa) and strain (17.7%), favorable sensing performance, and good response performance. In addition, in vitro toxicity experiments indicated that the composite films exhibited no cytotoxicity. Therefore, the flexible sensor based on RC-CNT composite films has potential applications in wearable personal health monitoring and tactile sensitive information collection.
Yuanyuan Xie and Haiyu Xu authors have contributed equally to this work. Y. Xie X. He Z. Shi J. Li (&) School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China e-mail: [email protected] Y. Xie H. Xu Y. Hu E. Zhu Y. Gao D. Liu Z. Shi (&) Q. Yang C. Xiong School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Carbon nanotubes Regenerated cellulose Electrical properties Mechanical properties
Introduction Human skin acts as a transmitter, which converts external stimuli into electrical signals that the brain can recognize, thereby helping the body perceive the changes (Jo et al. 2018). Electronic skin (E-skin) is a sensing device that artificially simulates human skin to detect external stimuli and converts them into measurable and recordable signals (Liao et al. 2017). In recent years, E-skin sensors have received widespread attention due to their extraordinary application prospects. Several studies have been published in the past few years. Wang and co-workers demonstrated a flexible temperature sensor (FTS) fitting on human skin based on non-woven fabric (Wang et al. 2020). Zhang and co-workers reported an innovative strategy to fabricate multilayer piezoresistive pressure sensors with polydimethylsiloxane anchored carbonized cotton fabric (PACCF), which possessed not only a wide pressure detection range, but also a
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