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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Supports matter: unraveling the role of charge transfer in the plasmonic catalytic activity of silver nanoparticles

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Autor(es):
Papa, Letizia ; de Freitas, Isabel C. ; Geonmonond, Rafael S. ; de Aquino, Caroline B. ; Pieretti, Joana C. ; Domingues, Sergio H. ; Ando, Romulo A. ; Camargo, Pedro H. C.
Número total de Autores: 8
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF MATERIALS CHEMISTRY A; v. 5, n. 23, p. 11720-11729, JUN 21 2017.
Citações Web of Science: 10
Resumo

The immobilization of plasmonic nanoparticles onto supports with suitable electronic properties represents an intuitive strategy for the modulation of nanoscale charge-transfer processes and thus the optimization of plasmonic catalytic performances. Here, we report the investigation of the effect of two kinds of bi-imensional (2D) supports, i.e., partially reduced graphene oxide (prGO) and ultrathin titanate nanosheets (TixO2), on the plasmonic catalytic performances of Ag nanoparticles (NPs). As prGO and TixO2 act as electron donor and acceptor materials, respectively, when combined with plasmonic nanoparticles under 633 nm excitation, their similar 2D morphologies enabled us to systematically probe and compare how charge transfer to and from Ag NPs affected their plasmonic catalytic activities. By employing the SPR-mediated oxidation of p-aminothiophenol (PATP) to p,p'-dimercaptoazobenzene (DMAB) as a model reaction, we found that the performances of the hybrids were superior relative to unsupported Ag NPs and that the PATP oxidation mechanism and conversion were dependent on the nature of the support. We also prepared the tri-component hybrid comprised of Ag NPs, prGO and TixO2 nanosheets (Ag/TixO2/prGO), which displayed a similar performance to Ag/prGO. In this material, a mechanism based on the cooperative effect of the supports was proposed, in which charge transfer from prGO to Ag NPs is intensified by the presence of TixO2 nanosheets. We believe that our results expand the understanding on the electronic behavior of complex plasmonic systems, which can allow the rational design of nanoparticle systems with improved performances towards plasmonically triggered or enhanced transformations. (AU)

Processo FAPESP: 15/21366-9 - Materiais híbridos contendo nanopartículas metálicas para aplicações catalíticas
Beneficiário:Pedro Henrique Cury Camargo
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
Beneficiário:Antônio Hélio de Castro Neto
Linha de fomento: Auxílio à Pesquisa - Programa SPEC