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首页> 外文会议>Symposium on Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures Dec 2-6, 2002 Boston, Massachusetts, U.S.A. >THE USE OF SURFACE ENHANCED RAMAN SCATTERING FOR THE DETECTION OF DIPICOLINIC ACID ON SILVER NANOPARTICLES
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THE USE OF SURFACE ENHANCED RAMAN SCATTERING FOR THE DETECTION OF DIPICOLINIC ACID ON SILVER NANOPARTICLES

机译：使用表面增强拉曼散射检测银纳米颗粒上的双吡啶酸

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摘要

We report on the use of surface enhanced Raman scattering (SERS) for the detection of dipicolinic acid (DPA) adsorbed on a silver (Ag) nanoparticle substrate. We have examined the interaction of DPA with Ag nanoparticles in a slightly basic, aqueous solution and determined that the molecule adsorbs as a dipicolinate anion on the metal surface. For micro molar or lower DPA concentrations in the colloid solution, no SERS activity from the adsorbed molecule was observed until nanoparticle aggregation was induced by reducing the pH with the addition of nitric acid. Following aggregation, the SERS response exhibited vibrational bands associated with both the pyridine ring and the carboxylate moieties in the adsorbed dipicolinate species. With proper control of the colloidal solution chemistry, the dipicolinate vibrational features could be observed in the SERS spectra at concentrations as low as 20 nano molar, a limit determined by the presence of solution-based contaminants on the Ag surface. In addition to the controlled DPA analyte studies, SERS was also able to detect the release of this molecule from Bacillus globigii spores, a non-toxic simulant for Bacillus anthracis, which demonstrated the potential of this optical spectroscopy for the detection of biological and chemical agents.
机译：我们报告了使用表面增强拉曼散射（SERS）来检测吸附在银（Ag）纳米颗粒基质上的二吡啶甲酸（DPA）。我们已经检查了DPA与微碱性水溶液中的Ag纳米粒子的相互作用，并确定了该分子以二吡啶甲酸根阴离子的形式吸附在金属表面上。对于胶体溶液中的微摩尔或更低的DPA浓度，在通过添加硝酸降低pH值诱导纳米颗粒聚集之前，未观察到吸附分子的SERS活性。聚集后，SERS反应表现出与吸附的吡啶二甲酸酯类物质中的吡啶环和羧酸根部分相关的振动带。通过适当地控制胶体溶液的化学性质，可以在低至20纳摩尔的浓度下在SERS光谱中观察到二吡啶甲酸的振动特征，其极限由Ag表面上基于溶液的污染物的存在决定。除了进行受控的DPA分析物研究外，SERS还能够检测到无碳芽孢杆菌模拟物glogloii芽孢杆菌孢子中该分子的释放，这证明了这种光谱学在检测生物和化学试剂方面的潜力。

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