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Title
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Preparation of nanocrystalline titania powder via aerosol pyrolysis of titanium tetrabutoxide
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Author
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Abstract
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| Nanocrystalline titanium dioxide was prepared via aerosol pyrolysis of titanium alkoxide precursor at 200-580 degrees C in air and in nitrogen atmospheres. Powders were characterized by x-ray diffraction, thermogravimetric analysis, Brunauer-Emmett-Teller analysis, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, x-ray fluorescence, Raman and infrared spectroscopy, and Berner-type low-pressure impactor. The anatase phase transition was initiated at 500 degrees C in nitrogen and at 580 degrees C in air. Under other conditions amorphous powders were observed and transformed to nanocrystalline TiO2 via thermal postannealing. In air, smooth and spherical particles with 2-4-mu m diameter were formed with an as-expected tendency to convert to rutile in the thermal postannealings. In nitrogen, a fraction of the titanium tetrabutoxide precursor evaporated and formed ultrafine particles via the gas-to-particle conversion. At 500 degrees C thermally stable anatase phase was formed in nitrogen. A specific surface area as high as 280 m(2) g(-1) was observed for an as-prepared powder. |
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Language
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English
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Source (journal)
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Journal of materials research. - New York, N.Y., 1986, currens
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Publication
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New York, N.Y.
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1999
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ISSN
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0884-2914
[print]
2044-5326
[online]
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DOI
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10.1557/JMR.1999.0533
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Volume/pages
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14
:10
(1999)
, p. 3938-3948
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ISI
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000083163700019
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Full text (Publisher's DOI)
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