Understanding the formation and growth of Ag nanoparticles on silver chromate induced by electron irradiation in electron microscope: A combined experimental and theoretical study
- Department of Chemistry, CDMF/INCTMN, São Carlos Federal University, P.O. Box 676, CEP 13565-905 São Carlos, SP (Brazil)
- Department of Analytical and Physical Chemistry, Universitat Jaume I, Campus del Riu Sec, E-12071 Castellón (Spain)
- Department of Chemistry, INCTMN, Maranhão Federal Institute, CEP 65030-005 São Luís, MA (Brazil)
- Department of Inorganic and Organic Chemistry, Universitat Jaume I, Campus del Riu Sec, E-12071 Castellón (Spain)
Ag{sub 2}CrO{sub 4} 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 Ag{sub 2}CrO{sub 4} 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 [AgO{sub 6}] and [AgO{sub 4}] clusters, generating ideal conditions for the growth of Ag nanoparticles. - Graphical abstract: Theoretical representation of the Ag{sub 2}CrO{sub 4} orthorhombic structure. Display Omitted - Highlights: • The Ag{sub 2}CrO{sub 4} microcrystals indicate an orthorhombic structure. • The formation of Ag{sup 0} promotes Ag-nanoparticle growth on the surface of the Ag{sub 2}CrO{sub 4}. • Electron irradiation of the material induces the formation of Ag vacancies.
- OSTI ID:
- 22584164
- Journal Information:
- Journal of Solid State Chemistry, Vol. 239; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHROMATES
COPRECIPITATION
CRYSTALS
DENSITY
DENSITY FUNCTIONAL METHOD
ELECTRON BEAMS
ELECTRON MICROSCOPES
ELECTRON SCANNING
ELECTRONS
FIELD EMISSION
IRRADIATION
NANOPARTICLES
OPTICAL PROPERTIES
ORTHORHOMBIC LATTICES
SCANNING ELECTRON MICROSCOPY
SILVER
SPECTROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
X RADIATION
X-RAY DIFFRACTION