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Ren, Yongyuan; Liu, Ziyang; Jin, Guoqing; Yang, Mengke; Shao, Yizhe; Li, Weizheng; Wu, Yiqing; Liu, Lili; Yan, Feng
Advanced materials (Weinheim), 03/2021, Letnik: 33, Številka: 12Journal Article
Human fingers exhibit both high sensitivity and wide tactile range. The finger skin structures are designed to display gradient microstructures and compressibility. Inspired by the gradient mechanical Young's modulus distribution, an electric‐field‐induced cationic crosslinker migration strategy is demonstrated to prepare gradient ionogels. Due to the gradient of the crosslinkers, the ionogels exhibit more than four orders of magnitude difference between the anode and the cathode side, enabling gradient ionogel‐based flexible iontronic sensors having high‐sensitivity and broader‐range detection (from 3 × 102 to 2.5 × 106 Pa) simultaneously. Moreover, owing to the remarkable properties of the gradient ionogels, the flexible iontronic sensors also show good long‐time stability (even after 10 000 cycles loadings) and excellent performance over a wide temperature range (from −108 to 300 °C). The flexible iontronic sensors are further integrated on soft grips, exhibiting remarkable performance under various conditions. These attractive features demonstrate that gradient ionogels will be promising candidates for smart sensor applications in complex and extreme conditions. Inspired by gradient modulus distribution of human fingers, gradient ionogels are prepared by an electric‐field‐induced cationic crosslinkers migration strategy. The gradient of the modulus distribution enables the gradient‐ionogel‐based flexible sensors to demonstrate high sensitivity and broader‐range detection simultaneously. Moreover, the flexible iontronic sensors also show good longtime stability and excellent performance over a wide temperature range.
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