Fiber-optic SERS sensor with optimized geometry
Fiber-optic SERS sensor with optimized geometry
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DOI：
10.1016/j.snb.2006.03.050
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发表时间：
2007-02-20
影响因子：
8.4
通讯作者：
Zerbi, Giuseppe
中科院分区：
文献类型：
--
作者：
Lucotti, Andrea;Zerbi, Giuseppe
研制了一种新型表面增强拉曼散射（SERS）传感器。该传感器采用“光极”结构，其中一根光纤既可以传输激发激光辐射，也可以传输吸附在SERS活性衬底上的分子发出的SERS信号。该传感器的主要优点是其独特的几何形状，可以通过用40%氢氟酸水溶液覆盖有机溶剂覆盖层的双重静态蚀刻工艺获得。采用3-氨基丙基三甲氧基硅烷固定纳米银的标准工艺制备了SERS活性底物。优化的几何结构允许达到最佳的检测限（LOD）值，曾在文献中报道的光纤SERS传感器。特别是，我们能够在蒸馏水中记录10(-9)M （0.018 ppb）结晶紫溶液的SERS光谱，既可以在溶液中进行测量，也可以使用“浸干”技术进行测量。此外，在如此低浓度下检测结晶紫等分子的能力使该SERS传感器非常有希望用于监测该分子在水产养殖业中的广泛非法使用。(c) 2006 Elsevier B.V.版权所有
A novel surface enhanced Raman scattering (SERS) sensor has been developed and built. This sensor uses an "optrode" configuration in which a single optical fiber transmits both the exciting laser radiation and the SERS signal from the molecules adsorbed onto the SERS active substrate. The main advantage of this sensor is its unique geometry which can be obtained by means of a double static etching process achieved with a 40% hydrofluoric acid aqueous solution covered with an organic solvent over-layer. The SERS active substrate is prepared by a standard process of immobilizing silver nanoparticles with 3-aminopropyltrimethoxysilane. The optimized geometry permits attainment of the best limit of detection (LOD) value ever reported in the literature for a fiber-optic SERS sensor. In particular, we are able to record SERS spectra from a 10(-9) M (0.018 ppb) solution of crystal violet in distilled water both with measurements performed in solution and with a "dip and dry" technique. Moreover, the capability to detect molecules such as crystal violet at such very low concentrations make this SERS sensor very promising for monitoring the diffuse illicit use of this molecule in aquaculture industry. (c) 2006 Elsevier B.V. All rights reserved.