Bionic electronic skin (E-skin) that could convert external physical or mechanical stimuli into output signals has a wide range of applications including wearable devices, artificial prostheses, software robots, etc. Here, we present a chameleon-inspired multifunctional E-skin based on hydroxypropyl cellulose (HPC), Poly(Acrylamide-co-Acrylic acid) (PACA), and carbon nanotubes (CNTs) composited liquid-crystal hydrogel. We found that the HPC could still form cholesteric liquid-crystal photonic structures with the CNTs additive for enhancing their color saturation and PACA polymerization for locating their assembled periodic structures. As the composite hydrogel containing HPC elements and the PACA scaffold responds to different stimuli, such as temperature variations, mechanical pressure, and tension, it could correspondingly change its volume or internal nanostructure and report these as visible color switches. In addition, due to the additive of CNTs, the composite hydrogel could also output these stimuli as electrical resistance signals. Thus, the hydrogel E-skins had the ability of quantitatively feeding back external stimuli through electrical resistance as well as visually mapping the stimulating sites by color variation. This dual-signal sensing provides the ability of visible-user interaction as well as antiinterference, endowing the multifunctional E-skin with great application prospects.

可以将外部物理或机械刺激转换为输出信号的仿生电子皮肤（E-skin）具有广泛的应用，包括可穿戴设备，人造假体，软件机器人等。在这里，我们介绍一种基于变色龙启发的多功能E-皮肤羟丙基纤维素（HPC），聚（丙烯酰胺-共-丙烯酸）（PACA）和碳纳米管（CNT）复合液晶水凝胶的制备。我们发现HPC仍可与CNTs添加剂形成胆甾型液晶光子结构以增强其色饱和度，并通过PACA聚合来定位其组装的周期性结构。由于包含HPC元素和PACA支架的复合水凝胶会响应不同的刺激，例如温度变化，机械压力和张力，它可以相应地改变其体积或内部纳米结构，并将其报告为可见的颜色开关。此外，由于添加了碳纳米管，复合水凝胶也可以将这些刺激物输出为电阻信号。因此，水凝胶E-皮肤具有通过电阻定量反馈外部刺激的能力，以及通过颜色变化在视觉上绘制刺激部位的能力。这种双信号感应提供了可见用户交互以及抗干扰的能力，为多功能电子皮肤提供了广阔的应用前景。水凝胶E-皮肤具有通过电阻定量反馈外部刺激的能力，以及通过颜色变化在视觉上绘制刺激部位的能力。这种双信号感应提供了可见用户交互以及抗干扰的能力，为多功能电子皮肤提供了广阔的应用前景。水凝胶E-皮肤具有通过电阻定量反馈外部刺激的能力，以及通过颜色变化在视觉上绘制刺激部位的能力。这种双信号感应提供了可见用户交互以及抗干扰的能力，为多功能电子皮肤提供了广阔的应用前景。