刺激响应多功能复合凝胶的设计、制备以及在智能皮肤中的应用

Interest in the field of Internet-of-Things (IoT) has witnessed exponential growth in the worldwide over the past few years due to its great application prospects. One of the key technologies is to establish a large-scale perceptual network. In recent years, the concept of intelligent skin (electronic skin and ionic skin) has been put forward, which is an effective way to collect and identify various information (including people’s and objects’) in the IoT. However, besides acquiring sensitive and stable signals, profound challenges remain in achieving good mechanical adaptability of the intelligent skin, e.g., low modulus, high toughness, stretchability, easy processing, self-healing and matching with the dynamic surfaces. Inspired by the design of ionic skin, we propose to develop novel intelligent skin based on stimuli-responsive multifunctional composite gels. Compared with organic/inorganic semiconductors in the electronic skin, gels have an advantage of broadly adjustable mechanical properties, and it is easy to introduce stimulus responses and thus achieve multiple perceived abilities. In this project, two dimensional correlation spectroscopy will be used to analyze the relationship of the molecular structures - molecule motions - macroscopic properties. Then the gels with special mechanical and stimulus-responsive behavior will be prepared, and the low-cost, biocompatible, mechanically adaptable, multi-responsive and large-area wearable intelligent skin will be fabricated, which might provide a novel route to build large-scale IoT.

物联网由于其巨大应用前景越来越受到世界各国广泛重视，其中的关键技术之一是建立大规模信息感知层。近年来新兴的智能皮肤技术（电子皮肤和离子皮肤）是实现物联网中人与物信息采集和识别的有效途径。目前智能皮肤发展中的重大挑战是在获得灵敏稳定的信号之外，如何进一步实现良好力学适应性，包括低模量、高韧性、可拉伸、易加工、自修复以及保持与动态界面的高度匹配。根据离子皮肤的设计思路，申请人拟发展基于刺激响应多功能复合凝胶的新型智能皮肤，相比传统电子皮肤中的有机/无机半导体材料，凝胶具有力学性能可广泛调节的优势，并且易于引入刺激响应功能，集合多种感知能力。本项目将通过二维相关光谱分析建立凝胶中微观分子结构-分子运动-宏观性能之间的关系，进而制备具有特殊力学行为和刺激响应功能的凝胶材料，构筑低成本、生物相容、力学适应性好、集合多种感知能力、可大面积穿戴的新型智能皮肤，为未来大规模物联网的构筑提供新途径。

本重点项目从理解并精准调控动态（高分子与小分子、高分子与其它高分子）相互作用的角度出发，设计了多个高分子动态交联体系，通过模拟人体皮肤的优异综合力学性质和高度智能感知响应功能，制备的智能材料及其器件在物联网、人工智能、可穿戴设备以及软物质机器人等领域都受到广泛关注和应用。.项目的关键点是要克服传统智能传感材料的刚性、不可折叠拉伸、破坏后不易自修复等弊端，发展大面积、低成本、轻质化、高灵敏、具有良好力学适应性以及多种感知能力的智能材料。为实现上述目标，在重点项目的支持下，本课题组研究人员受到人体皮肤组成以及传感原理的启发，结合柔性、可拉伸、可自修复的电子/离子传输材料，发展了一系列可模拟人体皮肤功能的电子皮肤或离子皮肤设备。相关工作取得了丰富的成果，发表了一批高质量成果。部分核心内容先后发表在Joule、Matter、Science Advances、 Nature Communications（5篇）、Advanced Materials（5篇）、Angew. Chemie (2篇)等领域最顶级刊物上。