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

Grasseschi, Daniel ; Zamarion, Vitor M ; Araki, Koiti ; Toma, Henrique E

Analytical chemistry (Washington), 2010-11, Vol.82 (22), p.9146-9149 [Periódico revisado por pares]

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Título:
Surface Enhanced Raman Scattering Spot Tests: A New Insight on Feigl’s Analysis Using Gold Nanoparticles
Autor: Grasseschi, Daniel ; Zamarion, Vitor M ; Araki, Koiti ; Toma, Henrique E
Assuntos: Analytical chemistry ; Chemistry ; Exact sciences and technology ; Gold ; Ions ; Molecules ; Nanoparticles ; Scattering ; Spectrometric and optical methods
É parte de: Analytical chemistry (Washington), 2010-11, Vol.82 (22), p.9146-9149
Notas: SourceType-Other Sources-1
content type line 63
ObjectType-Correspondence-1
Descrição: 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.
Editor: Washington, DC: American Chemical Society
Idioma: Inglês

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