AVANSI, W.

LEITE, E. R.

MASTELARO, V. R.

RIBEIRO, C.

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Synthesis and characterization of nanostrctured V2O5nH2O prepared throughout the hydrothermal method.

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Synthesis and characterization of nanostructured V2O5nH2O prepared throughout the hydrothermal method  W.Avansi1, C. Ribeiro2, E.R. Leite3, V.R. Mastelaro1 1IFSC-GCCMC, Universidade de S. Paulo, São Carlos, SP, Brazil. 2Embrapa, Empresa Brasileira de Pesquisas Agropecuárias, São Carlos, SP, Brazil.  3 LIEC – DQ/UFSCAR , Universidade Federal de São Carlos, São Carlos, SP, Brazil.   Recently, it has been shown that nanostructured materials presenting an anisotropic nanostructure can present new properties and applications [1-3].  Recently, a large attention has been given to the synthesis of vanadium pentoxide (V2O5nH2O) nanoparticles mainly due its wide variety of applications [4,5]. The main objective of this work is study the mechanism of growth during the formation of V2O5nH2O nanoparticles prepared throughout the decomposition of vanadium peroxide when submitted to a hidrothermal treatment. The samples were prepared by dissolving the quantity of V2O5 powder in a hydrogen peroxide (H2O2) solution with a 1:10 V2O5/H2O2 molar ratio, completing the desired volume with distilled water. A clear yellow solution was formed after 10 minutes, indicating the formation of vanadium peroxide. The solution was packed in a reacting bottle with the objective that all the gas produced during the decomposition was not set free. The bottle was placed in a regular laboratory oven and subjected to a thermal treatment. The samples were subjected at different temperature and time of treatments. X-ray analysis revealed the formation of a high-preferred phase orientation on the (00l) direction, and that the basal distance d depend on the temperature and time of heat-treatment. As expected, the basal distance increases with increasing number of water molecules in the structure [5]. The high-resolution transmission electron microscopy (HRTEM) results shows that that the samples are in a ribbon form with a particle size less than 20nm and that the nanoparticle growth preferentially on the direction of [010]. Key words: Vanadium oxide, Hydrothermal synthesis, X-ray diffraction, HR-TEM. Work supported by FAPESP. Research partially carried out at LME-LNLS – National Laboratory of Synchrotron Light, Brazil.    [1] C. Ribeiro, H.E.J. Lee, T.R. Giraldi, J.A. Varella, E. Longo, E.R. Leite, J. Phys. Chem. B 2004 108, 15612 (2004).  [2] E.J.H. Lee, C. Ribeiro, E. Longo, E.R. Leite, J. Phys. Chem. B 109, 20842 (2005). [3] E.R. Leite, C. Vila, J. Bettini, E.Longo, The J. Phys. Chem. B Letters, B 110 (37): 18088 (2006). [4] Y. Wang, G. Cao, Chem. Mater. 18, 2787 (2006). [5] J. Livage, Chem. Mater. 3, 578 (1991).  e-mail: w_avansi@ifsc.usp.br IFSC - GCCMC - Universidade de São Paulo Cx. Postal 369  São Carlos – SP, CEP: 13560-970.  

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Synthesis and characterization of nanostrctured V2O5nH2O prepared throughout the hydrothermal method.

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