Department of Instrumentation and Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
J Fluoresc. 2010 Jan;20(1):269-74. doi: 10.1007/s10895-009-0550-3. Epub 2009 Oct 13.
A novel fiber-optic evanescent wave sensor (FOEWS) for O(2) detection based on Ru(bpy)(3)-doped hybrid fluorinated ORMOSILs (organically modified silicates) has been developed. The sensing element was fabricated by dip-coating the optical fiber with Ru(bpy)(3)-doped hybrid fluorinated ORMOSILs composed of n-propyltrimethoxysilane (n-propyl-TriMOS) and 3, 3, 3-trifluoropropyltrimethoxysilane (TFP-TriMOS). Fluorophores of Ru(bpy)(3) were excited by the evanescent wave field produced on the fiber core surface and the emission fluorescence was quenched by O(2). Spectroscopic properties have been characterized by FTIR and UV-VIS absorption measurements. By using the presented hybrid fluorinated ORMOSILs, which enhances the coating surface hydrophobicity, the quenching response is increased. The sensitivity of the sensor is 7.5, which is quantified in terms of the ratio I (N2)/I (O2) (I (N2) and I (O2) represent the fluorescence intensities in pure N(2) and pure O(2) environments, respectively). The limit of detection (L.O.D.) is 0.01% (3sigma) and the response time is about 1 s. Meanwhile, the proposed FOEWS has the advantages of easy fabrication, low cost, fast response and suitable sensitivity for oxygen monitoring using a cheap blue LED as light source and coupling a miniature PMT detector directly to the optical fiber probe.
一种基于Ru(bpy)(3)掺杂杂化氟硅氧烷(有机改性硅)的新型光纤倏逝波传感器(FOEWS)已被开发用于 O(2)检测。传感元件是通过将光纤浸入由正丙基三甲氧基硅烷(n-propyl-TriMOS)和 3,3,3-三氟丙基三甲氧基硅烷(TFP-TriMOS)组成的Ru(bpy)(3)掺杂杂化氟硅氧烷中来制备的。荧光团Ru(bpy)(3)被光纤芯表面产生的倏逝场激发，而发射荧光被 O(2)猝灭。通过傅里叶变换红外光谱(FTIR)和紫外-可见吸收测量对光谱特性进行了表征。通过使用增强涂层表面疏水性的杂化氟硅氧烷，可以提高猝灭响应。传感器的灵敏度为 7.5，其以 I (N2)/I (O2)的比值来定量表示(I (N2)和 I (O2)分别代表在纯 N(2)和纯 O(2)环境中的荧光强度)。检测限(L.O.D.)为 0.01%(3sigma)，响应时间约为 1 秒。同时，所提出的 FOEWS具有易于制造、成本低、响应速度快以及灵敏度适合使用廉价的蓝色 LED 作为光源和直接将微型 PMT 探测器耦合到光纤探头进行氧气监测等优点。
