Chromophore-Containing Polymers for Trace Explosive Sensors

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• 作者：Antao Chen ; Haishan Sun ; Anna Pyayt ; Xunqi Zhang ; Jingdong Luo ; Alex Jen ; Philip A. Sullivan ; Samy Elangovan ; Larry R. Dalton ; Raluca Dinu ; Danliang Jin ; Diyun Huang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：May 29, 2008
• 年：2008
• 卷：112
• 期：21
• 页码：8072 - 8078
• 全文大小：233K
• 年卷期：v.112,no.21(May 29, 2008)
• ISSN：1932-7455

文摘

The optical properties such as index of refraction and optical absorption of many chromophore-containing polymers are sensitive to the physical and chemical environment to which the polymers are exposed. To demonstrate such applications, chemical sensors to detect trace explosives are presented. The sensors use polymers that contain chromophores whose molecular structure consists of an electron donor and an electron acceptor connected by a charge-transfer bridge of conjugated π-orbital electrons. The polymers used for the trace explosives sensor are not poled, and the chromophores are randomly oriented in the polymer host. Waveguide microring resonator and fiber Bragg grating structures were used in these sensors to enhance the detection sensitivity. Because chromophores undergo photodecomposition under intense ultraviolet radiation, chromophore-containing polymers can be patterned with ultraviolet light to create optical resonator structures in a single photobleaching step. The chemical sensor has shown part-per-billion level sensitivity and good specificity to the vapor, in air, of an explosive simulant 2,4-dinitrotoluene.