Ultrastretchable Composite Organohydrogels with Dual Cross-Links Enabling Multimodal Sensing,ACS Applied Materials & Interfaces

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Ultrastretchable Composite Organohydrogels with Dual Cross-Links Enabling Multimodal Sensing
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-01 , DOI: 10.1021/acsami.2c18667
Chenguang Jiang ₁ , Xuexue Ding ₁ , Wenyuan Xie _{1,

2} , Defeng Wu _{1,

3}

Affiliation

Building multiple cross-links or networks is a favorable way of diversifying applications of the hydrogels, which is also available for the organohydrogels prepared via the solvent replacement way. However, the situations become more complicated for organohydrogels due to the presence of replaced solvents. Therefore, the correlations between the multiple cross-links and final performance need to be better understood for the organohydrogels, which is vital for tailoring their inherent properties to expand final application scenarios. Polyacrylamide (PAM)/poly(vinyl alcohol) (PVA)/MXene composite organohydrogels with dual cross-links, namely, the covalently cross-linked PAM chains as the primary network and the physically cross-linked PVA/PAM chains with MXene particles as the secondary cross-links, were developed here for the study. The occurrence of the secondary cross-links plays multiple roles as sacrificial units endowing the system with ultrastretchability with an excellent strain–resistance effect and as temperature-sensitive units endowing the system with thermosensation ability with an outstanding temperature coefficient of resistance. Thus, the optimized sample can be used as a strain sensor with excellent environmental tolerance for detecting human motion as a pressure sensor to probe compression with weak deformation and as a thermal sensor to capture environmental temperature changes. This work provides valuable information on developing organohydrogels with superior performance for multimodal sensors.

中文翻译：

具有双交联的超拉伸复合有机水凝胶可实现多模式传感

构建多个交联或网络是水凝胶应用多样化的有利途径，这也适用于通过溶剂置换法制备的有机水凝胶。然而，由于替代溶剂的存在，有机水凝胶的情况变得更加复杂。因此，需要更好地了解有机水凝胶的多重交联与最终性能之间的相关性，这对于定制其固有特性以扩展最终应用场景至关重要。具有双交联的聚丙烯酰胺（PAM）/聚（乙烯醇）（PVA）/MXene 复合有机水凝胶，即共价交联的 PAM 链作为主要网络，物理交联的 PVA/PAM 链与 MXene 颗粒作为二级交叉链接，在这里开发用于研究。二次交联的出现起到多重作用，作为牺牲单元赋予系统超拉伸性和优异的抗应变效果，作为温度敏感单元赋予系统热敏能力和出色的电阻温度系数。因此，优化后的样品可用作具有优异环境耐受性的应变传感器，用于检测人体运动；用作压力传感器，用于探测微弱变形的压缩；用作热传感器，用于捕获环境温度变化。这项工作为开发具有卓越性能的多模态传感器有机水凝胶提供了有价值的信息。

更新日期：2022-12-01

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