Hierarchical Assembly of CaMoO4 Nano-Octahedrons and Their Photoluminescence Properties
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Data
2011-04-07
Autores
Longo, Valeria M. [UNESP]
Cavalcante, Laecio S. [UNESP]
Paris, Elaine C. [UNESP]
Sczancoski, Julio C. [UNESP]
Pizani, Paulo S.
Li, Maximo Siu
Andres, Juan
Longo, Elson [UNESP]
Varela, José Arana [UNESP]
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Amer Chemical Soc
Resumo
Hierarchical assemblies of CaMoO4 (CM) nano-octahedrons were obtained by microwave-assisted hydrothemial synthesis at 120 degrees C for different times. These structures were structurally, morphologically and optically characterized by X-ray diffraction, micro-Raman spectroscopy, field-emission gun scanning electron microscopy, ultraviolet-visible absorption spectroscopy and photoluminescence measurements. First-principle calculations have been carried out to understand the structural and electronic order-disorder effects as a function of the particle/region size. Supercells of different dimensions were constructed to simulate the geometric distortions along both they and z planes of the scheelite structure. Based on these experimental results and with the help of detailed structural simulations, we were able to model the nature of the order-disorder in this important class of materials and discuss the consequent implications on its physical properties, in particular, the photoluminescence properties of CM nanocrystals.
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Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 115, n. 13, p. 5207-5219, 2011.