Influences of Composition on Electroless Deposition of Silver Nanoparticles on Glass Substrates for Surface-Enhanced Raman Scattering Measurements
Influences of Composition on Electroless Deposition of Silver Nanoparticles on Glass Substrates for Surface-Enhanced Raman Scattering Measurements
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DOI：
10.1366/000370208786822232
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发表时间：
2008-12
影响因子：
3.5
通讯作者：
M. Cheng;Jyisy Yang
中科院分区：
文献类型：
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作者：
M. Cheng;Jyisy Yang
采用银镜反应制备表面增强拉曼散射(SERS)活性衬底。用一层薄薄的银纳米颗粒(Ag-NPs)对玻璃板进行表面处理。系统地研究了影响SERS衬底性能的因素。影响因素包括浓度、络合剂种类和还原剂。用对硝基苯酚(PNTP)对含银纳米粒子的表面进行了测试，观察到的信号用于比较不同还原剂和络合剂的性能。用扫描电子显微镜(SEM)观察了不同反应条件下生成的纳米银颗粒的形貌，并与表面增强拉曼散射信号进行了关联。还原剂包括甲醛、酒石酸钠和几种碳水化合物。结果表明，以葡萄糖为还原剂制备的银纳米粒子最适合用于SERS测量。氨络合剂和乙胺络合剂的性能最好。络合剂的最佳浓度约为银离子浓度的6倍。在反应时间为2min的条件下，葡萄糖和硝酸银的最佳浓度分别为0.5M和50 mM。一般而言，对于本工作中制备的基质，增强系数在105到106的数量级。
A silver-mirror reaction was used to prepare active substrates for surface-enhanced Raman scattering (SERS). Glass plates were surface treated with a thin layer of silver nanoparticles (Ag-NPs). The factors influencing the performance of the SERS substrates were systematically studied. Factors included concentrations, species of complexing agents, and reducing agents. p-Nitrothiophenol (pNTP) was used to test the surfaces with Ag-NPs, with the observed signals used to compare the performance resulting from different reducing and complexing agents. The morphologies of the Ag-NPs formed by different reaction conditions were also examined by scanning electron microscope (SEM) and correlated with the SERS signals. Reducing agents included formaldehyde, sodium tartrate, and several carbohydrates. The results indicate that the use of glucose as a reducing agent produced the most suitable Ag-NPs for SERS measurements. Complexing agents of ammonia and ethyl amine offered the best performances. The optimal concentration of complexing agent was found to be approximately six times the concentration of silver ions. With a reaction time of 2 min, the optimized concentrations of glucose and silver nitrate were 0.5 M and 50 mM, respectively. In general, the enhancement factor was on the order of 105 to 106 for the substrates prepared in this work.