Colorimetric detection of volatile organic compounds using a colloidal crystal-based chemical sensor for environmental applications
Colorimetric detection of volatile organic compounds using a colloidal crystal-based chemical sensor for environmental applications
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DOI：
10.1016/j.snb.2007.03.003
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发表时间：
2007-08-08
影响因子：
8.4
通讯作者：
Hatsuzawa, Takeshi
中科院分区：
文献类型：
--
作者：
Endo, Tatsuro;Yanagida, Yasuko;Hatsuzawa, Takeshi
挥发性有机化合物（VOCs）等污染物的检测对于环境保护具有重要意义。然而，传统的监测方法通常是耗时的，并且需要昂贵的设备。在这项研究中，胶体晶体为基础的比色化学传感器开发的环境应用。该装置由一个玻璃基板与三维胶体晶体和聚（二甲基硅氧烷）（PDMS）弹性体。这种胶体晶体是通过用液体预聚物渗透聚苯乙烯纳米颗粒的乳白色晶格内的空隙到PDMS，然后热固化而产生的。当将能够溶胀弹性体基质的样品溶液如苯、甲苯或二甲苯施加到该晶体的表面时，晶格常数增加，从而布拉格衍射光的波长增加。在此基础上，我们展示了挥发性有机物的比色检测。因此，基于胶体晶体的化学传感器可用于专门确定VOC浓度。此外，使用这种基于胶体晶体的化学传感器，可以用肉眼观察到光学特性的变化。因此，该化学传感器可应用于环境应用的现场监测。(c)2007 Elsevier B.V.保留所有权利。
The detection of pollutants such as volatile organic compounds (VOCs) is of significant importance for environmental protection. However, conventional monitoring methods are often time consuming and require expensive equipments. In this study, a colloidal crystal-based colorimetric chemical sensor was developed for environmental applications. The device consists of a glass substrate with a three-dimensional colloidal crystal and poly(dimethylsiloxane) (PDMS) elastomer. Such a colloidal crystal was generated by infiltrating the voids within an opaline lattice of polystyrene nanoparticles with a liquid prepolymer to PDMS, followed by thermal curing. When a sample solution such as benzene, toluene, or xylene, capable of swelling the elastomer matrix, was applied to the surface of this crystal, the lattice constant and thus the wavelength of Bragg diffracted light was increased. On the basis of this mechanism, we demonstrated the colorimetric detection of VOCs. As a result, the colloidal crystal-based chemical sensor could be used to specifically determine VOC concentrations. Additionally, using this colloidal crystal-based chemical sensor, the change in the optical characteristics could be observed with the naked eye. Therefore, this chemical sensor can be applicable to on-site monitoring for environmental applications. (c) 2007 Elsevier B.V. All rights reserved.