| Texto completo | |
| Autor(es): |
Ferbonink, G. F.
[1]
;
Rodrigues, T. S.
[2]
;
dos Santos, D. P.
[1]
;
Camargo, P. H. C.
[2]
;
Albuquerque, R. Q.
[3]
;
Nome, R. A.
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas UNICAMP, Inst Quim, Campinas, SP - Brazil
[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[3] Liverpool John Moores Univ, Sch Pharm & Biomol Sci, Liverpool, Merseyside - England
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | FARADAY DISCUSSIONS; v. 208, p. 269-286, AUG 1 2018. |
| Citações Web of Science: | 0 |
| Resumo | |
In this study, we investigated hollow AgAu nanoparticles with the goal of improving our understanding of the composition-dependent catalytic activity of these nanoparticles. AgAu nanoparticles were synthesized via the galvanic replacement method with controlled size and nanoparticle compositions. We studied extinction spectra with UV-Vis spectroscopy and simulations based on Mie theory and the boundary element method, and ultrafast spectroscopy measurements to characterize decay constants and the overall energy transfer dynamics as a function of AgAu composition. Electron-phonon coupling times for each composition were obtained from pump-power dependent pump-probe transients. These spectroscopic studies showed how nanoscale surface segregation, hollow interiors and porosity affect the surface plasmon resonance wavelength and fundamental electron-phonon coupling times. Analysis of the spectroscopic data was used to correlate electron-phonon coupling times to AgAu composition, and thus to surface segregation and catalytic activity. We have performed all-atom molecular dynamics simulations of model hollow AgAu core-shell nanoparticles to characterize nanoparticle stability and equilibrium structures, besides providing atomic level views of nanoparticle surface segregation. Overall, the basic atomistic and electron-lattice dynamics of core-shell AgAu nanoparticles characterized here thus aid the mechanistic understanding and performance optimization of AgAu nanoparticle catalysts. (AU) | |
| Processo FAPESP: | 15/21366-9 - Materiais híbridos contendo nanopartículas metálicas para aplicações catalíticas |
| Beneficiário: | Pedro Henrique Cury Camargo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia |
| Beneficiário: | Roberto Manuel Torresi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 16/23430-9 - Explorando a dinâmica estocástica de nanomateriais |
| Beneficiário: | René Alfonso Nome Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |