Effects of calcination on the microstructures and photocatalytic properties of nanosized titanium dioxide powders prepared by vapor hydrolysis

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)566-572
Journal / PublicationJournal of the American Ceramic Society
Issue number3
Publication statusPublished - 1999
Externally publishedYes


Ultrafine titanium dioxide powders were synthesized in an aerosol reactor using vapor hydrolysis of titanium tetraisopropoxide (TTIP) at 260 °C and higher temperatures. The effect of calcination on the microstructure and the photoactivity was studied. The powders were characterized using Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction, and transmission electron microscopy analyses. As the calcination temperatures were increased, the surface area decreased but the rutile-to-anatase ratio and the anatase and rutile crystallite sizes increased. Powders produced at higher temperatures were predominantly anatase and were generally photoactive.

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