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Artificial Chameleon Skin with Super-Sensitive Thermal and Mechanochromic Response
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsnano.1c05612 Yue Wu 1 , Yu Wang 1 , Shufen Zhang 1 , Suli Wu 1
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsnano.1c05612 Yue Wu 1 , Yu Wang 1 , Shufen Zhang 1 , Suli Wu 1
Affiliation
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Both the nonclose-packed structure and the large refractive index contrast of guanine nanocrystals and cytosols in iridophores play a vital role in the dynamic camouflage of chameleons, including the bright skin color and color tuning sensitivity to external stimulus. Here, the nonclose-packed photonic crystals consisting of ZnS nanospheres and polymers, which have similar refractive indices with guanine nanocrystals and cytosols, respectively, are constructed by a two-step filling strategy. ZnS@SiO2 nanospheres are self-assembled to build intermediate close-packed photonic crystals followed by filling polymers in their interstices. The nonclose-packed photonic crystal is successfully achieved when the silica portion is etched by HF solution and refilled by polymers. Excitingly, the stimulus response of the designed photonic crystal is as sensitive as the skin of chameleons due to the similar contrast of refractive indices and nonclose-packed structure. The reflection peak of the structure can blue-shift more than 200 nm as the temperature increases from 30 to 55 °C or under 20% compressional strain. This work not only builds the nonclose-packed photonic crystals by introducing a two-step filling strategy but also proves that high refractive contrast in photonic crystals is an effective strategy to achieve ultrasensitivity, which is highly desirable for various applications.
中文翻译：
具有超敏感热和机械变色响应的人造变色龙皮肤
虹彩细胞中鸟嘌呤纳米晶体和细胞溶胶的非密堆积结构和大折射率对比度在变色龙的动态伪装中起着至关重要的作用，包括明亮的皮肤颜色和对外部刺激的颜色调整敏感性。在这里，由ZnS纳米球和聚合物组成的非密堆积光子晶体分别与鸟嘌呤纳米晶体和细胞溶胶具有相似的折射率，通过两步填充策略构建。硫化锌@SiO 2纳米球自组装以构建中间密堆积的光子晶体，然后在其间隙中填充聚合物。当二氧化硅部分被 HF 溶液蚀刻并用聚合物重新填充时，成功地实现了非密堆积光子晶体。令人兴奋的是，由于折射率和非密堆积结构的相似对比度，设计的光子晶体的刺激响应与变色龙的皮肤一样敏感。随着温度从 30°C 增加到 55°C 或在 20% 的压缩应变下，该结构的反射峰可以蓝移超过 200 nm。这项工作不仅通过引入两步填充策略来构建非密堆积光子晶体，而且还证明光子晶体中的高折射对比度是实现超灵敏度的有效策略，
更新日期：2021-10-26
中文翻译：
具有超敏感热和机械变色响应的人造变色龙皮肤
虹彩细胞中鸟嘌呤纳米晶体和细胞溶胶的非密堆积结构和大折射率对比度在变色龙的动态伪装中起着至关重要的作用，包括明亮的皮肤颜色和对外部刺激的颜色调整敏感性。在这里，由ZnS纳米球和聚合物组成的非密堆积光子晶体分别与鸟嘌呤纳米晶体和细胞溶胶具有相似的折射率，通过两步填充策略构建。硫化锌@SiO 2纳米球自组装以构建中间密堆积的光子晶体，然后在其间隙中填充聚合物。当二氧化硅部分被 HF 溶液蚀刻并用聚合物重新填充时，成功地实现了非密堆积光子晶体。令人兴奋的是，由于折射率和非密堆积结构的相似对比度，设计的光子晶体的刺激响应与变色龙的皮肤一样敏感。随着温度从 30°C 增加到 55°C 或在 20% 的压缩应变下，该结构的反射峰可以蓝移超过 200 nm。这项工作不仅通过引入两步填充策略来构建非密堆积光子晶体，而且还证明光子晶体中的高折射对比度是实现超灵敏度的有效策略，
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