Understanding the formation and growth of Ag nanoparticles on silver chromate induced by electron irradiation in electron microscope: A combined experimental and theoretical study

Autor(es)

Fabbro, Maria T. ^{[1, 2]} ; Gracia, Lourdes ^[3] ; Silva, Gabriela S. ^[1] ; Santos, Luis P. S. ^[4] ; Andres, Juan ^[3] ; Cordoncillo, Eloisa ^[2] ; Longo, E. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, CDMF INCTMN, Dept Chem, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Jaume 1, Dept Inorgan & Organ Chem, Campus Riu Sec, E-12071 Castellon de La Plana - Spain

^[3] Univ Jaume 1, Dept Analyt & Phys Chem, Campus Riu Sec, E-12071 Castellon de La Plana - Spain

^[4] Maranhao Fed Inst, INCTMN, Dept Chem, BR-65030005 Sao Luis, MA - Brazil

^[5] Univ Estadual Paulista, CDMF INCTMN, Inst Chem, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Chemistry; v. 239, p. 220-227, JUL 2016.
• Citações Web of Science: 11

Resumo

Ag2CrO4 microcrystals were synthesized using the co-precipitation method. These microcrystals were characterized through X-ray diffraction (XRD) with Rietveld analysis, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) with energy-dispersive spectroscopy (EDS), micro-Raman (MR). XRD patterns and Rietveld refinement data showed that the material exhibits an orthorhombic structure without any deleterious phases. FE-SEM and TEM micrographs revealed the morphology and the growth of Ag nanoparticles on Ag2CrO4 microcrystals during electron beam irradiation. These events were directly monitored in real-time. Their optical properties were investigated using ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy that allowed the calculation of the optical band gap energy. Theoretical analyses based on the density functional theory level indicate that the incorporation of electrons is responsible for structural modifications and formation of defects on the {[}AgO6] and {[}AgO4] clusters, generating ideal conditions for the growth of Ag nanoparticles. (C) 2016 Elsevier Inc. All rights reserved. (AU)

• 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