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Superficies y vacío
versión impresa ISSN 1665-3521
Superf. vacío vol.18 no.3 Ciudad de México sep. 2005
Articles
Structural evolution of Bi 2 O 3 prepared by thermal oxidation of bismuth nano-particles
1 Facultad de Química-Universidad Autónoma del Estado de México, Paseo Colón y Tollocan, C.P. 50130, Toluca, México.
2 Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México, D.F.
3 Instituto de Física-Universidad Nacional Autónoma de México, Apdo. Postal 20-364 México 01000 D.F.
Bismuth nano-sized particles were prepared by the chemical reduction method. These particles were characterized by HR-TEM, X-Ray Diffraction and Micro-Raman Spectroscopy. In order to obtain bismuth oxide, the as-obtained bismuth nano-particles were thermally treated in air at various temperatures in the range 100-750 0C during 30 min. The thermally treated samples were studied by Micro-Raman Spectroscopy. Additionally, information on the chemical composition and morphology was obtained by Energy Dispersive Spectroscopy and Scanning Electron Microscopy, respectively. Results show that bismuth nano-particles were oxidized at 100 oC and transformed into three of the five phases of Bi2O3 reported in literature; the obtained phase depends on the annealing temperature. The β-Bi2O3 phase was obtained for 200-300 0C, α-Bi2O3 for 400-600 0C and finally γ-Bi2O3 for 700-750 0C.
Keywords: Bismuth oxide; Thermal oxidation; Micro-Raman spectroscopy
Acknowledgments
This work was financially supported through the projects: PROMEP103.5/04/1352 and UAEM 1950/2004B
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Received: June 09, 2005; Accepted: August 13, 2005
This is an open-access article distributed under the terms of the
Creative Commons Attribution License
