writer：Chenguang Jiang, Xuexue Ding, Wenyuan Xie,* Defeng Wu*
keywords：organohydrogels; ultra-stretchability; dual crosslinks; multimodal sensing; environmental adaptability.
source：期刊
specific source：ACS Applied Materials & Interfaces
Issue time：2022年

ACS Applied Materials & Interfaces, 2022, 14, 55143?55154.

Building multiple crosslinks 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 crosslinks 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)/polyvinyl alcohol (PVA)/MXene composite organohydrogel with dual crosslinks, 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 crosslinks, were developed here for the study. The occurrence of the secondary crosslinks plays multiple roles, as sacrificial units endowing the system with ultra-stretchability with excellent strain-resistance effect, and as temperature-sensitive units endowing the system with thermo-sensation 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.

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https://doi.org/10.1021/acsami.2c18667

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