Surface-enhanced Raman scattering from silver-plated porous silicon
Surface-enhanced Raman scattering from silver-plated porous silicon
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DOI：
10.1021/jp049008b
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发表时间：
2004-08-05
影响因子：
3.3
通讯作者：
Sailor, MJ
中科院分区：
文献类型：
--
作者：
Lin, HH;Mock, J;Sailor, MJ
采用浸镀法在多孔硅衬底上制备了银微米和纳米晶沸石，并对其表面增强拉曼散射（Sers）活性进行了评价。扫描电子显微镜揭示了一个粗糙的银膜含有随机间隔的树枝状结构。用18 mW、488 nm激光获得了罗丹明6 G（R6 G）和腺嘌呤的表面增强Sers光谱。从这些分析物的Sers信号显着改善预处理的镀银多孔硅样品（Ag-PS）与1 mM的无机酸溶液。证明了从1 nM溶液中检测R6 G和腺嘌呤，对应于当前研究中使用的实验配置中的（最多）9 x 101个分子。在空气中存放10天的Ag-PS样品仍然显示出高灵敏度。发现分析物溶液或预处理溶液中氯化物的存在显著降低R6 G的检测限。
Silver micro- and nanocrystaltites are prepared on porous Si substrates by immersion plating, and their activity toward SERS (surface-enhanced Raman scattering) is assessed. Scanning electron microscopy reveals a rough silver film containing randomly spaced dendritic structures. SERS spectra of Rhodamine 6G (R6G) and adenine are obtained using an 18-mW, 488-nm laser. The SERS signal from these analytes is dramatically improved by pretreatment of the silver-plated porous Si samples (Ag-PS) with a 1 mM mineral acid solution. Detection of R6G and adenine from 1 nM solutions is demonstrated, corresponding to (at most) 9 x 101 molecules in the experimental configuration used in the current study. Ag-PS samples that have been stored in air for 10 days still display high sensitivity. The presence of chloride either in the analyte solution or in the pretreatment solution is found to dramatically reduce the limit of detection for R6G.