Surface-Enhanced Resonance Raman Scattering of Polyaniline on Silver and Gold Colloids
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2008
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Resumo |
The interaction of emeraldine base (PANI-EB) with silver and gold colloids was probed by using Surface-Enhanced Resonance Raman Scattering (SERRS) at 3 different exciting radiations. Due to the great sensitivity of SERRS technique the detection limit of PANI-EB concentration was ca. 2 x 10(-7) mol L(-1) in Ag and Au colloidal suspensions. The UV-vis-NIR spectra of metal colloids in function of PANI-EB concentrations showed that gold colloids present a higher degree of aggregation than silver colloids. SERRS of PANI-EB on metal colloids allowed the study of the polymeric species formed primarily on the metallic surface. The polymer formed after the adsorption of PANI-EB on metallic nanoparticles is strongly dependent on the nature of the metal colloids. The oxidation of PANI-EB to pernigraniline occurred for silver colloids, while a doping process of PANI-EB on Au nanoparticles was evidenced through the observation of the characteristic SERRS spectrum of emeraldine salt at 1064nm. CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) FAPESP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) IM2C (Instituto do Milenio de Materiais Complexos) IM2C (Instituto do Milenio de Materiais Complexos) |
Identificador |
JOURNAL OF PHYSICAL CHEMISTRY B, v.112, n.51, p.16334-16340, 2008 1520-6106 http://producao.usp.br/handle/BDPI/31539 10.1021/jp805373s |
Idioma(s) |
eng |
Publicador |
AMER CHEMICAL SOC |
Relação |
Journal of Physical Chemistry B |
Direitos |
restrictedAccess Copyright AMER CHEMICAL SOC |
Palavras-Chave | #THIN-FILMS #SERS SPECTRA #SPECTROSCOPIC CHARACTERIZATION #BASE POLYANILINE #EMERALDINE BASE #PART I #OXIDATION #LEUCOEMERALDINE #NANOCOMPOSITES #NANOPARTICLES #Chemistry, Physical |
Tipo |
article original article publishedVersion |