Hybrid materials containing metal nanoparticles for catalytic applications
| Full text | |
| 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: | 13/19861-6 - Controlled metal nanomaterials for catalysis applications |
| Grantee: | Pedro Henrique Cury Camargo |
| Support type: | Regular Research Grants |
| FAPESP's process: | 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration |
| Grantee: | Antonio Helio de Castro Neto |
| Support type: | Research Projects - SPEC Program |
| 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 type: | Scholarships in Brazil - Post-Doctorate |