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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.)

Probing the Catalytic Activity of Reduced Graphene Oxide Decorated with Au Nanoparticles Triggered by Visible Light

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Author(s):
Wang, Jiale [1] ; Trindade, Fabiane J. [1] ; de Aquino, Caroline B. [2] ; Pieretti, Joana C. [2] ; Domingues, Sergio H. [2] ; Ando, Romulo A. [1] ; Camargo, Pedro H. C. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CHEMISTRY-A EUROPEAN JOURNAL; v. 21, n. 27, p. 9889-9894, JUN 26 2015.
Web of Science Citations: 9
Abstract

Hybrid materials in which reduced graphene oxide (rGO) is decorated with Au nanoparticles (rGO-Au NPs) were obtained by the in situ reduction of GO and AuCl4(aq)- by ascorbic acid. On laser excitation, rGO could be oxidized as a result of the surface plasmon resonance (SPR) excitation in the Au NPs, which generates activated O-2 through the transfer of SPR-excited hot electrons to O-2 molecules adsorbed from air. The SPR-mediated catalytic oxidation of p-amino-thiophenol (PATP) to p,p'-dimercaptoazobenzene (DMAB) was then employed as a model reaction to probe the effect of rGO as a support for Au NPs on their SPR-mediated catalytic activities. The increased conversion of PATP to DMAB relative to individual Au NPs indicated that charge-transfer processes from rGO to Au took place and contributed to improved SPR-mediated activity. Since the transfer of electrons from Au to adsorbed O-2 molecules is the crucial step for PATP oxidation, in addition to the SPR-excited hot electrons of Au NPs, the transfer of electrons from rGO to Au contributed to increasing the electron density of Au above the Fermi level and thus the Au-to-O-2 charge-transfer process. (AU)

FAPESP's process: 13/05709-8 - Palladium, Silver-Palladium, and Palladium-Platinum Nanomaterials: Maneuvering Shape, Composition, and Structure for Catalytic Applications
Grantee:Jiale Wang
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antonio Helio de Castro Neto
Support Opportunities: Research Projects - SPEC Program
FAPESP's process: 13/19861-6 - Controlled metal nanomaterials for catalysis applications
Grantee:Pedro Henrique Cury Camargo
Support Opportunities: Regular Research Grants