Light-Induced Swelling-Responsive Conductive, Adhesive, and Stretchable Wireless Film Hydrogel as Electronic Artificial Skin
Light-Induced Swelling-Responsive Conductive, Adhesive, and Stretchable Wireless Film Hydrogel as Electronic Artificial Skin
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DOI：
10.1002/adfm.201903209
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发表时间：
2019-08-01
影响因子：
19
通讯作者：
Park, Sung Young
中科院分区：
文献类型：
--
作者：
Ryplida, Benny;Lee, Kang Dae;Park, Sung Young
光致无线软电子皮肤水凝胶具有优异的机械和电子性能，对于软机器人和智能可穿戴设备等应用非常重要。精确控制可逆拉伸性和电容性能取决于分子间相互作用和表面特性仍然是一个挑战。在这里，一种薄膜水凝胶的基础上设计的氧化钛（TiO 2）聚多巴胺-全氟硅碳点共轭壳聚糖-聚乙烯醇负载单宁酸与可控的疏水-亲水性转变在紫外可见光照射的存在下。薄膜表面的润湿性由疏水性向亲水性的转变影响薄膜的透水性和溶胀率。这允许水渗透到基质中以改变其机械强度、电子性质和粘合行为。具体地，水凝胶响应于光刺激显示出高达278%的机械应变，并证明了恢复其初始状态的能力，这决定了制造材料的弹性。此外，当用UV和可见光照射时，薄膜水凝胶显示电导率分别增加至1.096 x 10（-3）和1.026 x 10（-3）S cm（-1）。水凝胶表现出电容可逆性，遵循手指运动，可以直接或远程使用无线连接识别，指示其可能的应用作为人造电子皮肤。
Light-induced wireless soft electronic skin hydrogels with excellent mechanical and electronic properties are important for several applications, such as soft robotics and intelligent wearable devices. Precise control of reversible stretchability and capacitive properties depending on intermolecular interaction and surface characteristics remains a challenge. Here, a thin-film hydrogel is designed based on titanium oxide (TiO2) polydopamine-perfluorosilica carbon dot-conjugated chitosan-polyvinyl alcohol-loaded tannic acid with controllable hydrophobic-hydrophilic transition in the presence of UV-vis light irradiation. The shifting of surface wettability from hydrophobic to hydrophilic by irradiation affects thin-film water permeability and swelling ratio. This allows the penetration of water into the matrix to change its mechanical strength, electronic properties, and adhesive behavior. Specifically, the hydrogel displays mechanical strain as high as 278% in response to light stimuli and demonstrates the ability to regain its initial state determining the elasticity of the fabricated material. Moreover, the thin-film hydrogel shows an increase in conductivity to 1.096 x 10(-3) and 1.026 x 10(-3) S cm(-1) when irradiated with UV and visible light, respectively. The hydrogel exhibits capacitive reversibility that follows finger motion which can be identified directly or remotely using wireless connection, indicative of its possible applications as an artificial electronic skin.