A conductive polyacrylamide/double bond chitosan/polyaniline hydrogel for flexible sensing
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A conductive polyacrylamide/double bond chitosan/polyaniline hydrogel for flexible sensing Houpeng Xie1 · Qijian Yu1 · Jie Mao2 · Sui Wang1 · Yufang Hu1 · Zhiyong Guo1 Received: 22 February 2020 / Accepted: 11 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Flexible strain sensors, based on their good electrical conductivity and strain sensitivity, are widely used in wearable health monitoring, sensitive tactile information display and multi-functional robot skin. However, it is still a challenge for wearable devices to prepare conductive hydrogel with flexibility, high strain, high sensitivity and biocompatibility. Herein, we designed an interpenetrating network conductive composite hydrogel, which composed with polyaniline, double bond modified chitosan and acrylamide, has excellent strength and toughness due to its unique physically and chemically cross-linked double network. The obtained hydrogel exhibited good tensile strength (0.3 MPa), high electrical conductivity (6.97 S/m) and strain sensitivity (gauge factor 15.9). The results showed that the strain sensor could detect the movement of human joints through electrical signals, and had good stability and reproducibility, which indicated that it was expected to be used in wearable health monitoring and multi-functional robot skin.
1 Introduction In recent years, flexible, retractable and wearable strain sensors have been widely used in human motion detection [1], human–machine interface [2] and smart clothing [3]. These strain sensors convert mechanical deformation into a detectable electrical signal [4, 5]. In particular, flexible electronic skin with strain sensitivity has a wide range of applications of human motion detection and intelligent robots [6, 7]. Conductive hydrogels (ECHs), as a new type of conductive material, are ideal materials for the preparation of flexible electronic skin due to their variable structure, mechanical flexibility, ease of processing and biocompatibility [8, 9]. Hydrogel composites of conductive nanomaterials (metal particles, carbon nanotubes, graphene) and conductive polymers (polythiophene, poly (3, 4-ethylenedioxythiophene), polyaniline, polypyrrole and poly(p-phenylene-vinylidene) have been developed as strain sensors [10–15]. However, * Sui Wang [email protected] 1
State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro‑products, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, People’s Republic of China
Department of Basic, Zhejiang Pharmaceutical College, Ningbo 315000, Zhejiang, People’s Republic of China
2
conductive nanomaterials have lower solubility in water and thus tend to aggregate during hydrogel formation, resulting in poor electrical performance of the composite hydrogel of the conductive nano-material. Moreover, such ECHs have limited ductility, high cost, poor durability, the reversible tensile strain of these devices is broken and the strain of break is less than 100% [16].
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