Institute of Safety Science and Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510641, P. R. China.
Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, P. R. China.
ACS Appl Mater Interfaces. 2023 Dec 6;15(48):56275-56284. doi: 10.1021/acsami.3c12930. Epub 2023 Nov 20.
Hydrogels have attracted significant attention in various fields, such as smart sensing, human-machine interaction, and biomedicines, due to their excellent flexibility and versatility. However, current hydrogel electronic skins are still limited in stretchability, and their sensing functionality is often single-purpose, making it difficult to meet the requirements of complex environments and multitasking. In this study, we developed an MXene nanoplatelet and phytic acid-coreinforced poly(vinyl alcohol) (PVA) composite, denoted as MXene-PA-PVA. The strong hydrogen bonds formed by the interaction of the different components and the enhancement of chain entanglement result in a significant improvement in the mechanical properties of the PVA/PA/MXene composite hydrogel. This improvement is reflected in an increase of 271.43% in the maximum tensile strain and 35.29% in the maximum fracture stress. Moreover, the composite hydrogel exhibits excellent adhesion, water retention, heat resistance, and conductivity properties. The PVA/PA composite material combined with MXene demonstrates great potential for use as multifunctional sensors for strain and temperature detection with a strain-sensing sensitivity of 3.23 and a resistance temperature coefficient of 8.67. By leveraging the multifunctional characteristics of this composite hydrogel, electronic skin can accurately monitor human behavior and physiological reactions. This advancement opens up new possibilities for flexible electronic devices and human-machine interactions in the future.
水凝胶因其出色的柔韧性和多功能性，在智能传感、人机交互和生物医学等领域引起了广泛关注。然而，目前的水凝胶电子皮肤在拉伸性方面仍然有限，其传感功能往往是单一用途的，难以满足复杂环境和多任务的要求。在本研究中，我们开发了一种 MXene 纳米片和植酸核增强聚乙烯醇（PVA）复合材料，称为 MXene-PA-PVA。不同成分相互作用形成的强氢键和链缠结的增强导致 PVA/PA/MXene 复合水凝胶的机械性能显著提高。这种改善体现在最大拉伸应变增加了 271.43%，最大断裂应力增加了 35.29%。此外，复合水凝胶还具有优异的附着力、保水能力、耐热性和导电性。PVA/PA 复合材料与 MXene 结合，有望用作应变和温度检测的多功能传感器，其应变传感灵敏度为 3.23，电阻温度系数为 8.67。通过利用这种复合水凝胶的多功能特性，电子皮肤可以准确地监测人体行为和生理反应。这一进展为未来的柔性电子设备和人机交互开辟了新的可能性。
