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Type: Artigo de periódico
Title: Morphology and phase modifications of MoO3 obtained by metallo-organic decomposition processes
Author: Santos, ED
Silva, JMDE
Mazali, IO
Abstract: Molybdenum oxide samples were prepared using different temperatures and atmospheric conditions by metallo-organic decomposition processes and were characterized by XRD, SEM and DRS UV/Vis and Raman spectroscopies. Variation in the synthesis conditions resulted in solids with different morphologies and oxygen vacancy concentrations. Intense characteristic Raman bands of crystalline orthorhombic alpha-MoO3, occurring at 992 cm(-1) and 820 cm(-1), are observed and their shifts can be related to the differences in the structure of the solids obtained. The sample obtained under nitrogen flow at 1073 K is a phase mixture of orthorhombic alpha-MoO3 and monoclinic beta-MoO3. The characterization results suggest that the molybdenum oxide samples are non-stoichiometric and are described as MoOx with x < 2.94. Variations in the reaction conditions make it possible to tune the number of oxygen defects and the band gap of the final material. (C) 2010 Elsevier Ltd. All rights reserved.
Subject: Oxides
Chemical synthesis
Raman spectroscopy
Crystal structure
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.materresbull.2010.06.057
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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