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Synthesis and characterization of TiO2 nanocrystalline powder prepared by homogeneous precipitation using urea

Published online by Cambridge University Press:  31 January 2011

Dong Seok Seo ,
Hwan Kim ,
Hang Chul Jung  and
Jong Kook Lee
Dong Seok Seo
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
Hwan Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
Hang Chul Jung
Affiliation:
Division of Metallurgical and Materials Engineering, Chosun University, Gwangju 501–759, Korea
Jong Kook Lee*
Affiliation:
Division of Metallurgical and Materials Engineering, Chosun University, Gwangju 501–759, Korea
*
a)Address all correspondence to this author. e-mail: jklee@mail.chosun.ac.kr
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Abstract

TiO2 nanocrystalline powder was synthesized by homogeneous precipitation method using urea, and its characteristics were investigated through comparison with the powder prepared by conventional precipitation using ammonia. The homogeneously precipitated powder was anatase-type TiO2 with a particle size of 4–5 nm and a uniform spherical particle shape. The fact that the transformation from anatase to rutile was prohibited at elevated temperatures in the homogeneously precipitated powder can be useful to prepare anatase-type TiO2 thin films by calcination at high temperatures. With increasing heat-treatment temperature, the particle size of the homogeneously precipitated powder was smaller than that of the conventionally precipitated powder, and the particle shape was more uniform. The homogeneously precipitated powder showed good photocatalytic activity for Ag ion photoadsorption because the powder had both good crystallinity and a large specific surface area of 280 m2/g.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 571 - 577
Copyright
Copyright © Materials Research Society 2003

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