Stability of silver colloids as substrate for surface enhanced Raman spectroscopy detection of dipicolinic acid

被引：28

作者：

Guingab, J. D. ^{[1
]}

Lauly, B. ^{[1
]}

Smith, B. W. ^{[1
]}

Ornenetto, N. ^{[1
]}

Winefordner, J. D. ^{[1
]}

机构：

[1] Univ Florida, Dept Chem, Gainesville, FL 32611 USA

来源：

TALANTA | 2007年 / 74卷 / 02期

关键词：

surface enhanced Raman spectroscopy; silver colloids; dipicolinic acid; aggregation; Bacillus spores;

D O I：

10.1016/j.talanta.2007.06.001

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Silver colloids have been commonly used as substrates for surface enhanced Raman spectroscopy (SERS). It has been shown that SERS requires partial aggregation of the silver colloids. This study evaluates factors affecting the aggregative state of the silver colloids such as the age of the silver colloids and the aggregation as a result of addition of the analyte. The silver colloids are obtained from the chemical reduction of silver nitrate by sodium borohydride. Further oxidation of the sodium borohydride solution at room temperature results in concentration changes of the resulting silver colloids. Methods of controlling the sodium borohydride depletion are presented in this paper. The analyte used is dipicolinic acid, a molecular signature of Bacillus spores. (c) 2007 Published by Elsevier B.V.

引用

页码：271 / 274

页数：4

共 20 条

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