Junzheng Chen,Xue Lv,Xikun Zhang,Huiwen Jia,Yanmin Ma,Wang Xu,Xiaoning Yang,Di Fang,Shurui Yi
Conductive hydrogels are valued for their flexibility and sensitivity for flexible wearable sensors, but they typically focus on strain sensing and lack features such as fast temperature response. In addition, discarded sensors can cause environmental problems. Based on this, we developed a novel G 2 B 3 M 4 hydrogel using NIPAAm, AM, PDA@BN, MXene, and SA to achieve dual response to temperature and strain as well as reuse after disposal. The addition of the copolymerized hydrophilic monomer AM successfully changed the lowest critical solution temperature (LCST) of G 2 B 3 M 4 to approach the normal body temperature. In addition, the excellent dispersion of PDA@BN in the G 2 B 3 M 4 hydrogel not only improved its temperature sensitivity (TCR = −1.953 %/°C) but also resulted in a high stress (730.38 kPa), strain (6994.18 %), elasticity (49.14 kPa) and toughness (2644.17 KJ/m 3 ). In addition, the abundant catechol groups, amino groups and carboxyl groups in G 2 B 3 M 4 hydrogel not only make it have good adhesion to various substrates but also can be used as a template to reduce Ag + to Ag NPs to serve as a catalyst for the efficient degradation of dye wastewater. The hydrogel has good application prospects in the field of flexible sensors.
Chao Yang,Jun Pan,Tingfeng Xie,Yan Lv,Yihua Ni,Zhongjin Ni,Dalie Liu
Conductive hydrogels have wide use in multifunctional sensors. Nevertheless, the intrinsic features of conductive hydrogels, including the absence of sensation mechanisms with varied properties, impede their application in wearable devices . To this end, this paper fabricated a novel 3D network material, namely C/PVA/CaCl 2 /HK (CPCH) hydrogel, that comprises incorporation of graphite (C), calcium chloride (CaCl 2 ), hydrolyzed keratin (HK), and the polyvinyl alcohol-based (PVA-based) hydrogel. The CPCH hydrogel and the CPCH secondary hydrogel both exhibit impressive mechanical properties. The former features a maximum stress of 2.98 MPa and a maximum strain of 588 %, while the corresponding values of the latter are 1.590 MPa and 573 %, respectively. Additionally, the result showed a maximum reflected light barrier of the CPCH hydrogel at a wavelength of 248 nm. The study found that the CPCH hydrogel holds the fingers attached to the upper surface during heating for up to 10 s, demonstrating superior heat insulation performance. The gel fraction analysis revealed that the gel makes up 57.1 % of our prepared CPCH hydrogel with a porosity of 62.5 %. Besides, we conducted a conductivity test on the proposed hydrogel, obtaining a measured conductivity value of 0.04 mS/cm. Furthermore, its practicality and feasibility have been confirmed via experiments. The results show that the CPCH conductive hydrogel can potentially be a temperature-strain sensor for wearable devices .
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