Conductive and adhesive gluten ionic skin for eco-friendly strain sensor
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Conductive and adhesive gluten ionic skin for ecofriendly strain sensor Xiangsheng Han1,*
1 2
, Wenyu Lu1, Wenfan Yu1, Hang Xu1, Shuyan Bi2, and Hongzhen Cai1,*
School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China Boshan Jinjing School, Zibo 255200, China
Received: 13 August 2020
ABSTRACT
Accepted: 25 October 2020
Modified biomaterials combine the excellent properties of electric conductivity, mechanical strength, flexibility, adherence, biocompatibility and degradability, thus promising as flexible on-skin devices. Herein, an ionic conductive gluten (iGluten) was fabricated with the assistance of glycerol and ions. Owing to the strong interactions among glycerol, ions and the peptide chains in gluten, the resultant i-Gluten was conductive, mechanically strong and flexible (strength of * 150 kPa and elongation of * 600%), sticky, recoverable, biocompatible and degradable. Due to their tight adhesion on human skins and response of conductivity to shape deformation, the i-Gluten was capable of sensing both large-scale (finger, wrist and elbow bending) and subtle human motions (blow, frown and swallow), showing high sensibility and stability ([ 3000 cycles). These conductive glutens pave a simple and green way of constructing highperformance and eco-friendly biomaterials applicable for diverse wearable devices.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Maude Jimenez.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05508-3
J Mater Sci
GRAPHICAL ABSTRACT
Introduction Artificial ‘‘electronic skin’’ with human-like sensory abilities has attracted tremendous interests due to its broad applications in soft robots, wearable devices, etc. [1, 2]. Especially the wearable on-skin sensors, which can real-time monitor the variation of human body states, have long been a sought-after class of materials in human healthcare [3–5]. Generally, electronic on-skin sensors are composed of electrical conductors and flexible supports: Signals are reported through electrical conductors (e.g., conducting polymer [6, 7], metal nanomaterials [8], semiconductors [9], MXenes [10] and carbon-based nanomaterials [11, 12]) which are generally rigid and brittle and needed to be supported by polymer substrates (e.g., poly(ethylene terephthalate) [13], poly(dimethylsiloxane) [14, 15] and polyimide [16]) to improve flexibility. However, such structural features inevitably suffer from several major drawbacks including non-biocompatibility and nonbiodegradability, poor adhesion and adaptability to diverse surfaces and poor durability for long-time wearable sensing [17–19], which restrict their fully
mimicking of the intrinsic sensing properties of human skin. In order to overcome the above-mentioned problems, both conductive materials and flexible carriers are gaining developments. On one hand, inspired by the natural epithelium that conducts electricity mostly using ions, ionic con
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