Reusable Structural Colored Nanostructure for Powerless Temperature and Humidity Sensing
Reusable Structural Colored Nanostructure for Powerless Temperature and Humidity Sensing
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DOI：
10.1002/adom.202300300
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发表时间：
2023-05
影响因子：
9
通讯作者：
Pablo Cencillo‐Abad;Pamela Mastranzo-Ortega;D. Appavoo;Tianyi Guo;L. Zhai;J. Sánchez-Mondragón;
中科院分区：
文献类型：
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作者：
Pablo Cencillo‐Abad;Pamela Mastranzo-Ortega;D. Appavoo;Tianyi Guo;L. Zhai;J. Sánchez-Mondragón;
纳米结构材料实现了控制光与物质相互作用的新方法，为显示技术和色度传感等令人兴奋的应用开辟了新途径。特别是，金属纳米颗粒允许用无色材料生产彩色结构。这些等离子体结构颜色对环境敏感，因此提供了一个有趣的传感平台。在这里，靠近镜子的铝纳米粒子自组装体由超薄聚（N-异丙基丙烯酰胺）（PNIPAM）层间隔开。将等离子体系统与活性聚合物层混合，形成热响应间隙等离子体结构，将环境温度和相对湿度的变化转化为颜色变化。通过利用环境引起的 PNIPAM 结构变化，根据有限差分时域模拟估计，厚度每变化 1 nm，共振可调谐 7 nm，从而导致颜色变化。重要的是，这些完全可逆的变化可用于可重复使用的无动力湿度和温度比色传感。至关重要的是，如果结构上发生凝结，聚合物层就会变形而无法恢复，颜色也会被洗掉。我们利用这种效应来生产防篡改的露水标签，简单的智能手机应用程序可以通过拍照来读取标签。
Nanostructured materials have enabled new ways of controlling the light–matter interaction, opening new routes for exciting applications, in display technologies and colorimetric sensing, among others. In particular, metallic nanoparticles permit the production of color structures out of colorless materials. These plasmonic structural colors are sensitive to the environment and thus offer an interesting platform for sensing. Here, a self‐assembly of aluminum nanoparticles in close proximity of a mirror is spaced by an ultrathin poly(N‐isopropylacrylamide) (PNIPAM) layer. Hybridizing the plasmonic system with the active polymer layer, a thermoresponsive gap‐plasmon architecture is formed that transduces changes in the temperature and relative humidity of the environment into color changes. By harnessing the environmentally induced structural changes of PNIPAM, it was estimated from the finite difference time domain simulation that the resonance can be tuned 7 nm per every 1 nm change in thickness, resulting in color variation. Importantly, these fully reversible changes can be used for reusable powerless humidity and temperature colorimetric sensing. Crucially if condensation on the structure happens, the polymer layer is deformed beyond recovery and the colors are washed away. We leverage this effect to produce tamper‐proof dew labels that a straightforward smartphone app can read by taking a picture.