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首页> 外文期刊>Advanced Functional Materials >Photopatternable Nanolayered Polymeric Films with Fast Tunable Color Responses Triggered by Humidity
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Photopatternable Nanolayered Polymeric Films with Fast Tunable Color Responses Triggered by Humidity

机译：具有湿度触发的快速可调颜色响应的可光图案化的纳米层聚合物薄膜

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摘要

Smart surfaces that can dynamically respond to environmental stimuli have demonstrated great promise in wearable electronics and optical detectors. Herein, a photopatternable nanolayered polymeric film that can reversibly display and hide structural colors in the visible range in response to relative humidity (RH) changes is reported. This film is fabricated on a silicon substrate using layer-by-layer assembly of chitosan and photoreactive carboxymethyl cellulose-azido derivative, and selectively crosslinked through UV irradiation from a photomask. Compared to crosslinked regions, un-crosslinked ones swell more and result in a larger thickness at high RH; as a result, those two regions show distinguishable color differences. The correlation of displayed color with film thickness at various RHs is plotted in an International Commission on Illumination (CIE) chromaticity diagram, which is in good agreement with the results obtained from modeling based on the interference theory. It is demonstrated that the structural color patterns on the film can be hidden and displayed spontaneously by contact with humid air, including human breath. This humidity-triggered color change is fast, of fine resolution, highly reversible, and compatible with most silicon-based devices. This film is low-cost, stable, and ready to be applied to large surface areas for potential applications in anticounterfeiting, humidity sensors, and optical color filters.
机译：可以动态响应环境刺激的智能表面在可穿戴电子设备和光学探测器中显示出了巨大的希望。本文中，报道了响应于相对湿度（RH）的变化可在可见光范围内可逆地显示和隐藏结构颜色的可光图案化的纳米层聚合物膜。使用壳聚糖和光反应性羧甲基纤维素-叠氮基衍生物的逐层组装，将该膜制造在硅基板上，并通过来自光掩模的紫外线照射选择性地交联。与交联区域相比，未交联的区域溶胀更多，并在高RH下导致更大的厚度。结果，这两个区域显示出明显的色差。在国际照明委员会（CIE）色度图中绘制了显示的颜色与薄膜厚度之间的相关性，该图与基于干涉理论建模得到的结果非常吻合。已经证明，通过接触潮湿的空气，包括人的呼吸，可以自动隐藏和显示胶片上的结构颜色图案。这种由湿度触发的颜色变化速度快，分辨率高，可逆性高，并且与大多数基于硅的设备兼容。该膜价格低廉，稳定，可用于大面积表面，可用于防伪，湿度传感器和光学彩色滤光片。

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