Multiphoton fluorescence quenching of conjugated polymers for TNT detection
Multiphoton fluorescence quenching of conjugated polymers for TNT detection
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DOI：
10.1021/jp709662w
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发表时间：
2008-01-31
影响因子：
3.7
通讯作者：
Goodson, Theodore, III
中科院分区：
文献类型：
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作者：
Narayanan, Aditya;Varnavski, Oleg P.;Goodson, Theodore, III
共轭有机化合物在荧光传感应用中的应用已被证明提供了一种令人印象深刻的方法来检测高能硝基芳香族化合物。利用共轭聚合物的放大荧光猝灭效应对痕量硝基芳烃进行了检测。在单光子激发下，这种方法具有一定的局限性，例如使用有害的紫外辐射和来自光散射的相对高的背景噪声。一种新的方法，利用非线性光学方法的额外好处涉及多光子激发荧光。该技术采用红外激发，这对于眼睛安全应用是必不可少的，并且允许更深地穿透大气，背景噪声相对较低。本文报道了两种具有良好多光子吸收性能的共轭聚合物。这与多光子激发荧光对三硝基甲苯（TNT）存在的优异灵敏度相结合。提供了多光子吸收截面，并讨论了Stern-Volmer图。这种技术，结合各种有机材料的高分析物灵敏度，有望成为一种重要的传感技术在红外光谱区域。
The use of conjugated organic compounds in fluorescence sensing applications has been demonstrated to provide an impressive method to detect energetic nitro-aromatic compounds. The amplified fluorescence quenching in conjugated polymers was used for trace detection of nitro-aromatics. This method, under one-photon excitation, possesses certain limitations such as the use of harmful ultra-violet radiation and relatively high background noise from light scattering. A novel approach that utilizes the additional benefits of nonlinear optical methods involves multiphoton excited fluorescence. This technique employs infrared excitation which is essential for eye-safety applications and allows for deeper penetration through the atmosphere, with relatively low background noise. We herein report, two conjugated polymers which show good multiphoton absorption properties. This is combined with the excellent sensitivity of the multiphoton excited fluorescence to the presence of tri-nitro toluene (TNT). The multiphoton absorption cross-sections are provided and the Stern-Volmer plots are discussed. This technique, in combination with the great analyte sensitivity of various organic materials, promises to be an important sensing technology in the infrared spectral regions.