Surface-enhanced Raman scattering study of riboflavin on borohydride-reduced silver colloids: Dependence of concentration, halide anions and pH values
Surface-enhanced Raman scattering study of riboflavin on borohydride-reduced silver colloids: Dependence of concentration, halide anions and pH values
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DOI：
10.1016/j.saa.2011.09.043
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发表时间：
2012-01-01
影响因子：
4.4
通讯作者：
Cai, Tiantian
中科院分区：
文献类型：
--
作者：
Liu, Fangfang;Gu, Huaimin;Cai, Tiantian
研究了核黄素在硼氢化钠还原的银胶体上吸附的浓度、卤素阴离子和pH对核黄素表面增强拉曼散射（Sers）的影响。核黄素的最佳Sers浓度为10（-6）mol/L，不同模式的Sers增强效应不同。加入0.2mol/L的卤化物（NaCl、NaBr和NaI）水溶液，导致核黄素在514.5nm激发下的Sers强度普遍降低，光谱轮廓发生变化。核黄素可能通过尿嘧啶环的C=O和N-H模式与银表面相互作用。在pH值3.4-11.6范围内记录了核黄素的Sers光谱。通过对多个Sers标记带的分析，证明了胶体银颗粒表面吸附的分子种类是质子化的、去质子化的或两者共存。(C)2011 Elsevier B. V.保留所有权利。
The influences of concentration, halide anions and pH on the surface-enhanced Raman scattering (SERS) of riboflavin adsorbed on borohydride-reduced silver colloids were studied. The optimum concentration for the SERS of riboflavin is 10(-6) mol/L while the SERS enhancement varies for different modes. The addition of 0.2 mol/L halide (NaCl, NaBr, and Nal) aqueous solutions, leads to a general decrease of the SERS intensity and a change of spectral profile of riboflavin excited at 514.5 nm. Riboflavin interacts with the silver surface possibly through the C=O and N-H modes of the uracil ring. The SERS spectra of riboflavin were recorded in the 3.4-11.6 pH range. By analyzing several SERS marker bands, the protonated, deprotonated or the coexistence of both molecular species adsorbed on the colloidal silver particles was proved. (C) 2011 Elsevier B.V. All rights reserved.