Although conductive hydrogels have been widely developed currently, their low sensitivity and poor stability severely limited their practical application in flexible wearable devices. Herein, a green “stencil” anchoring strategy was proposed in this study to engineer an ultra-stable and supersensitive hydrogel by virtue of polydopamine decorating sodium alginate molecular chains as “stencil” to anchor polyaniline as conductive component. The dispersion of polyaniline was significantly improved by the sodium alginate “stencil” in the conductive hydrogel. The developed conductive hydrogel exhibited outstanding properties that outperformed most conventional ones, including extraordinary sensitivity with a gauge factor of 38.2 and excellent stability with negligible shifting upon long-term cyclic stretching. Moreover, the conductive hydrogel displayed great self-adhesion and reliable self-healing performance endowed by its abundant catechol groups, hydrogen bondings and π-π stackings, respectively. Furthermore, the prepared hydrogel was also assembled as flexible strain and self-powered sensors, which displayed excellent sensing performance, indicating great potential in human-machine interactions, information transmission and road transportation.

中文翻译：

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“海藻酸钠模板”锚定策略赋予超稳定和超灵敏的导电水凝胶

尽管导电水凝胶目前已被广泛开发，但其低灵敏度和较差的稳定性严重限制了其在柔性可穿戴设备中的实际应用。在此，本研究提出了一种绿色“模板”锚定策略，利用聚多巴胺装饰海藻酸钠分子链作为“模板”，将聚苯胺锚定为导电成分，设计出超稳定和超灵敏的水凝胶。导电水凝胶中的海藻酸钠“模板”显着改善了聚苯胺的分散性。所开发的导电水凝胶表现出优于大多数传统水凝胶的出色性能，包括应变系数为 38.2 的非凡灵敏度和长期循环拉伸时位移可忽略不计的出色稳定性。此外，由于其丰富的儿茶酚基团、氢键和π-π堆积，导电水凝胶分别表现出良好的自粘附性和可靠的自修复性能。此外，制备的水凝胶还可以组装成柔性应变和自供电传感器，表现出优异的传感性能，在人机交互、信息传输和道路交通方面具有巨大的潜力。