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

Autor: Wang J; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes, 748, 05508-000 São Paulo, SP (Brazil)., Trindade FJ; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes, 748, 05508-000 São Paulo, SP (Brazil)., de Aquino CB; MackGraphe-Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, Rua da Consolação, 896, 01302-907 São Paulo, SP (Brazil)., Pieretti JC; MackGraphe-Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, Rua da Consolação, 896, 01302-907 São Paulo, SP (Brazil)., Domingues SH; MackGraphe-Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, Rua da Consolação, 896, 01302-907 São Paulo, SP (Brazil)., Ando RA; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes, 748, 05508-000 São Paulo, SP (Brazil)., Camargo PH; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes, 748, 05508-000 São Paulo, SP (Brazil). camargo@iq.usp.br.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2015 Jun 26; Vol. 21 (27), pp. 9889-94. Date of Electronic Publication: 2015 May 26.
DOI: 10.1002/chem.201500677
Abstrakt: 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 O2 through the transfer of SPR-excited hot electrons to O2 molecules adsorbed from air. The SPR-mediated catalytic oxidation of p-aminothiophenol (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 O2 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-O2 charge-transfer process.
(© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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