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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
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]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: CHEMISTRY-A EUROPEAN JOURNAL; v. 20, n. 46, p. 15040-15046, NOV 10 2014.
Web of Science Citations: 21
Abstract

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)

FAPESP's process: 13/19861-6 - Controlled metal nanomaterials for catalysis applications
Grantee:Pedro Henrique Cury Camargo
Support type: Regular Research Grants
FAPESP's process: 12/13119-3 - Vibrational spectroscopy in condensed phases
Grantee:Mauro Carlos Costa Ribeiro
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/10831-7 - Determination of the molecular adsorption constant over a metallic surface employing Surface Enhanced Raman Scattering under single-molecule detection
Grantee:Michele Lemos de Souza
Support type: Scholarships in Brazil - Post-Doctorate