Surface Enhanced Raman Scattering Spot Tests: A New Insight on Feigl's Analysis Using Gold Nanoparticles

被引：44

作者：

Grasseschi, Daniel ^{[1
]}

Zamarion, Vitor M. ^{[1
]}

Araki, Koiti ^{[1
]}

Toma, Henrique E. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, Sao Paulo, Brazil

来源：

ANALYTICAL CHEMISTRY | 2010年 / 82卷 / 22期

关键词：

DITHIZONE ADSORPTION; METAL-ELECTRODES; PLASMON RESONANCE; SILVER; SPECTROSCOPY; COMPLEXES; CHEMISTRY; SIZE;

D O I：

10.1021/ac102238f

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Traditional Feigl's spot tests can be greatly improved with the aid of gold nanoparticles and Raman probes, by monitoring the changes in the surface enhanced Raman scattering (SERS) of the analytes directly applied on a filter paper previously impregnated with the selective organic reagent. As a proof of concept, diphenylthiocarbazone (dithizone) was treated with citrate stabilized gold nanoparticles and employed in paper spot tests for a variety of transition and heavy metal ions. Below 10(-5) mol L-1, only mercury(II) ions were able to displace the dithizone molecules from the "coordination shell" of the gold nanoparticles, leading to a systematic decay of the Raman signals. Because of the huge enhancement of the dithizone vibrational peaks, the SERS spot tests allowed the detection of picograms of Hg2+ ions.

引用

页码：9146 / 9149

页数：4

共 29 条

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