摘要
Ionic hydrogel-based sensors have shined a spotlight on wearable electronics.However,the sensitivity and reliability of hydrogel devices are significantly hampered by the weak adhesion of skin-sensor interface as well as inferior temperature tolerance.Here,inspired by the structure and composition of dermis,a novel skin-attachable and environment-stable hydrogel was designed by integrating collagen into the LiCl-containing chemically cross-linked polyacrylamide hydrogel.The hydrogel exhibited skin-like mechanical properties of low modulus,superior stretchability as well as excellent elasticity.Furthermore,the introduction of collagen endowed the hydrogel with robust and seamless interfaces with diverse materials,including the curved skin.As a result,the hydrogel is capable of serving as a human-machine interface for collecting reliable electrocardiography(ECG)signals and discerning various human motions,with high sensitivity(gauge factor=10.7),fast response,negligible hysteresis as well as extensive monitoring range.Notably,the hydrogel that can mimick the temperature-tolerant mechanism of most organisms possesses persistent stabilization of adhesive,conductive,sensory and mechanical performances at subzero or ambient conditions.The skin-inspired strategy paves an effective way for the design of multifunctional materials with potential applications in next-generation electronics.
离子水凝胶基传感器已经成为制备可穿戴电子产品的热点.然而,皮肤与传感器之间弱的界面粘合力以及水凝胶较差的耐温性严重影响了传感器的灵敏度和可靠性.受皮肤结构和功能的启发,我们将胶原蛋白整合到化学交联的水凝胶中,设计出一种新型的可皮肤附着的且环境稳定的水凝胶.该水凝胶具有较低的模量、良好的拉伸性能和良好的弹性.此外,胶原蛋白的引入使水凝胶与包括皮肤在内的多种材料具有牢固的和紧密贴合的界面.因此,该水凝胶具有极高的灵敏度(GF=10.7)、快速响应性、可忽略的迟滞行为以及广泛的监测范围,可作为人机界面以采集可靠的心电图(ECG)信号和辨别各种人体动作.值得注意的是,模仿大多数生物体的耐温机制的水凝胶在零下或常温条件下具有持久的粘合性、导电性、传感性能和机械稳定性.这种以皮肤为灵感的策略为多功能材料的设计提供了一条有效途径,并有望应用于新一代电子产品中.
作者
Yang Gao
Yuanrui Wang
Shan Xia
Guanghui Gao
高阳;王元瑞;夏珊;高光辉(Polymeric and Soft Materials Laboratory,School of Chemical Engineering,Advanced Institute of Materials Science,Changchun University of Technology,Changchun 130012,China)
基金
supported by the National Natural Science Foundation of China (51873024)
the Science and Technology Department of Jilin Province (20200708102YY and 20190201234JC)
