Rapid Synthesis of Hollow Ag-Au Nanodendrites in 15 Seconds by Combining Galvanic Replacement and Precursor Reduction Reactions

Autor(es)

da Silva, Anderson G. M. ^[1] ; de Souza, Michele L. ^[1] ; Rodrigues, Thenner S. ^[1] ; Alves, Rafael S. ^[1] ; Temperini, Marcia L. A. ^[1] ; Camargo, Pedro H. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRY-A EUROPEAN JOURNAL; v. 20, n. 46, p. 15040-15046, NOV 10 2014.
• Citações Web of Science: 21

Resumo

Metallic nanomaterials displaying hollow interiors as well as sharp tips/branches at their surface (such as hollow nanodendrites) are attractive, because these features enable higher surface-to-volume ratios than their solid and/or rounded counterparts. This paper describes a simple strategy for the synthesis of Ag-Au nanodendrites in 15s using Ag nanospheres prepared in a previous synthetic step as seeds. Our approach was based on the utilization of Ag nanospheres as seeds for Au deposition by a combination of galvanic replacement reaction between Ag and AuCl4-(aq) and AuCl4-(aq) reduction using hydroquinone in the presence of polyvinylpyrrolidone (PVP) as a stabilizer and water as the solvent. The produced Ag-Au nanodendrites presented monodisperse sizes, and their surface morphologies could be tuned as a function of growth time. Owing to their hollow interiors and sharp tips, the Ag-Au nanodendrites performed as effective substrates for surface-enhanced Raman scattering (SERS) detection of 4-MPy (4-mercaptopyridine) and R6G (rhodamine 6G) as probe molecules. We believe that the approach described herein can serve as a protocol for the fast and one-step synthesis of Ag-Au hollow nanondendrites with a wide range of sizes, compositions, and surface morphologies for applications in SERS and catalysis. (AU)

• Processo FAPESP: 13/19861-6 - Nanomateriais metálicos controlados para aplicações em catálise
• Beneficiário: Pedro Henrique Cury Camargo
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/13119-3 - Espectroscopia vibracional em fases condensadas
• Beneficiário: Mauro Carlos Costa Ribeiro
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/10831-7 - Determinação da constante de adsorção molecular em superfície metálica por Espectroscopia Raman intensificada pela superfície em regime de uma única molécula
• Beneficiário: Michele Lemos de Souza
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado