In Situ Growth of Bi Nanoparticles on NaBiO3, delta-, and beta-Bi2O3 Surfaces: Electron Irradiation and Theoretical Insights

Autor(es)

Assis, Marcelo ^[1] ; Carvalho de Oliveira, Marisa ^[2] ; Machado, Thales Rafael ^[1] ; Macedo, Nadia Guerra ^[1] ; Campos Costa, Joao Paulo ^[1] ; Gracia, Lourdes ^[2] ; Andres, Juan ^[2] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, LIEC, CDMF, POB 676, BR-13565905 Sao Paulo - Brazil

^[2] UJI, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry C; v. 123, n. 8, p. 5023-5030, FEB 28 2019.
• Citações Web of Science: 2

Resumo

Herein, we present a combined experimental and theoretical study of the in situ growth of Bi nanoparticles on NaBiO3, delta-, and beta-Bi2O3 surfaces mediated by the electron beam of a high-resolution transmission electron microscope. Density functional theory and quantum theory of atoms in molecule calculations were used to gain a deeper insight into the experimental observations and to provide an atomistic basis for understanding the formation mechanism of Bi NPs on NaBiO3, delta-, and beta-Bi2O3 under electron beam irradiation. Analysis of the experimental data and electron density distributions suggests that the formation of Bi NPs can be related to the structural and electronic changes occurring within the octahedral {[}BiO6] clusters, and to a lesser extent, {[}NaO6] clusters, which serve as the constituent building blocks of NaBiO3. Our findings indicate that as a function of the number of added electrons, the formation of beta-Bi2O3 takes place first followed by the subsequent appearance of metallic Bi NPs generated in the crystal by electron beam irradiation. (AU)

• Processo FAPESP: 13/26671-9 - Estudo teórico-experimental de semicondutores multifuncionais
• Beneficiário: Amanda Fernandes Gouveia
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs