Stimuli-responsive hydrogel is regarded as one of the most promising smart soft materials for the next-generation advanced technologies and intelligence robots, but the limited variety of stimulus has become a non-negligible issue restricting its further development. Herein, we develop a new stimulus of “touch” (i.e., spatial contact with foreign object) for smart materials and propose a flytrap-inspired touch-responsive polymeric hydrogel based on supersaturated salt solution, exhibiting multiple responsive behaviors in crystallization, heat releasing, and electric signal under touch stimulation. Furthermore, utilizing flytrap-like cascade response strategy, a soft actuator with touch-responsive actuation is fabricated by employing the touch-responsive hydrogel and the thermo-responsive hydrogel. This investigation provides a facile and versatile strategy to design touch-responsive smart materials, enabling a profound potential application in intelligence areas.

刺激响应水凝胶被认为是最有希望用于下一代先进技术和智能机器人的智能软材料之一，但刺激种类有限成为制约其进一步发展的不可忽视的问题。在此，我们为智能材料开发了一种新的“触摸”刺激（即与异物的空间接触），并提出了一种基于过饱和盐溶液的受捕蝇草启发的触摸响应聚合物水凝胶，在结晶、放热、和触摸刺激下的电信号。此外，利用类似捕蝇草的级联响应策略，通过使用触摸响应水凝胶和热响应水凝胶制造了具有触摸响应驱动的软驱动器。