Structural colour in colourimetric sensors and indicators
Structural colour in colourimetric sensors and indicators
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DOI：
10.1039/c3tc30919c
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发表时间：
2013-01-01
影响因子：
6.4
通讯作者：
Aizenberg, Joanna
中科院分区：
文献类型：
--
作者：
Burgess, Ian B.;Loncar, Marko;Aizenberg, Joanna
比色传感器和指示器因其成本低且简单而被广泛使用。与此类设备的设计相关的一个重大挑战是，必须同时优化传感机制，以实现响应的灵敏度和视觉上可感知的颜色变化。结构颜色源自相干散射而不是分子吸收，是比色传感器设计的一种有前途的途径，因为颜色变化与材料的许多物理特性之一的变化有关，而不是与特定的化学过程有关。本专题文章概述了利用结构颜色的低成本传感器和指示器的开发。基于结构自适应材料设计的最新进展，结构颜色传感器已被开发用于各种以前无法访问的物理刺激（例如温度、应变、电场）和化学刺激（例如有机小分子、带电物质、生物大分子和代谢物）。这些设备通常在性能、简单性或两者方面都超过了最先进的水平，在环境监测、工作场所危险识别、威胁检测和护理点诊断等领域具有光明的市场影响前景。在性能（例如灵敏度、特异性、再现性等）和简单性（例如比色与光谱读数）之间找到理想的平衡将是结构颜色传感器进一步开发中最关键的要素之一。这种平衡主要是由市场需求和竞争技术驱动的。
Colourimetric sensors and indicators are widely used because of their low cost and simplicity. A significant challenge associated with the design of this type of device is that the sensing mechanism must be simultaneously optimised for the sensitivity of the response and a visually perceptible colour change. Structural colour, derived from coherent scattering rather than molecular absorption, is a promising route to colourimetric sensor design because colour shifts are tied to changes in one of many physical properties of a material, rather than a specific chemical process. This Feature Article presents an overview of the development of low-cost sensors and indicators that exploit structural colour. Building upon recent advances in structurally adaptive materials design, structural colour sensors have been developed for a wide variety of previously inaccessible physical (e.g. temperature, strain, electric fields) and chemical stimuli (e.g. small organic molecules, charged species, biomacromolecules and metabolites). These devices, often exceeding the state of the art in performance, simplicity or both, have bright prospects for market impact in areas such as environmental monitoring, workplace hazard identification, threat detection, and point-of-care diagnostics. Finding the ideal balance between performance (e.g. sensitivity, specificity, reproducibility, etc.) and simplicity (e.g. colourimetric vs. spectroscopic readout) will be one of the most critical elements in the further development of structural colour sensors. This balance should be driven largely by the market demands and competing technologies.