Bioinspired Chromotropic Ionic Skin with In-Plane Strain/Temperature/Pressure Multimodal Sensing and Ultrahigh Stimuli Discriminability,Advanced Functional Materials

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Bioinspired Chromotropic Ionic Skin with In-Plane Strain/Temperature/Pressure Multimodal Sensing and Ultrahigh Stimuli Discriminability
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-17 , DOI: 10.1002/adfm.202208362
Heng Zhang ₁ , Haomin Chen _{1,

2} , Jeng‐Hun Lee ₁ , Eunyoung Kim ₁ , Kit‐Ying Chan _{1,

3} , Harun Venkatesan ₁ , Miracle Hope Adegun ₁ , Okikiola Ganiu Agbabiaka ₁ , Xi Shen _{1,

3} , Qingbin Zheng ₄ , Jinglei Yang _{1,

5} , Jang‐Kyo Kim _{1,

6}

Affiliation

Electronic skins (e-skins) mimic multimodal sensing capabilities of various tactile receptors in natural skin. Herein, a stretchable chromotropic ionic skin is rationally designed to simultaneously detect and decouple multiple stimuli, including in-plane strain, temperature, and pressure. The mutually discriminating trimodal ionic skin consists of mechanochromic, thermoresistive and triboelectric layers that individually function as strain, temperature and pressure sensors, respectively. These three distinct capabilities are integrated into the ionic skin which demonstrates highly sensitive responses to selective external stimuli while upholding high insensitivity to unwanted ones. The structural colors derived from mechanochromic photonic crystals of magnetic ferroferric oxide-carbon nanoparticles respond to strains by color-switching in the full visible spectrum, exhibiting appealing potential in interactive stress visualization. The temperature detection with an exceptional sensitivity of 20.44% per °C is enabled by the thermoresistive effect of ionic hydrogel, while oriented polymer chains embedded in the hydrogel decouple temperature from extraneous stimuli. The multilayer structure consisting of an ionic hydrogel film, a wrinkle-patterned polydimethylsiloxane (PDMS) film with gradient modulus design and a carbon nanotubes/PDMS electrode displays an extraordinary triboelectric effect with a strain- and temperature-insensitive pressure sensing capability. The chromotropic ionic skin facilitates simultaneously accurate measurements, high discriminability and quantitative mapping of complex stimuli, offering new insights into emerging E-skins.

中文翻译：

仿生变色离子皮肤，具有平面内应变/温度/压力多模式传感和超高刺激辨别能力

电子皮肤 (e-skins) 模仿天然皮肤中各种触觉感受器的多模式感知能力。在此，合理设计可拉伸变色离子皮肤，以同时检测和解耦多种刺激，包括面内应变、温度和压力。相互区分的三峰离子皮肤由机械变色层、热阻层和摩擦电层组成，它们分别充当应变、温度和压力传感器。这三种不同的能力被整合到离子皮肤中，它对选择性的外部刺激表现出高度敏感的反应，同时对不需要的刺激保持高度不敏感。源自磁性四氧化三铁-碳纳米粒子的机械变色光子晶体的结构颜色通过在全可见光谱中进行颜色切换来响应应变，在交互式应力可视化中展现出吸引人的潜力。温度检测具有 20.44%/°C 的异常灵敏度，这是通过离子水凝胶的热阻效应实现的，而嵌入水凝胶中的定向聚合物链使温度与外部刺激分离。由离子水凝胶薄膜、具有梯度模量设计的皱纹图案聚二甲基硅氧烷 (PDMS) 薄膜和碳纳米管/PDMS 电极组成的多层结构显示出非凡的摩擦电效应，具有应变和温度不敏感的压力传感能力。

更新日期：2022-09-17

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