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《CHINESE JOURNAL OF CATALYSIS》 1999-06
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THE QUANTUM SIZE EFFECT AND LIGHT ABSORPTION OF ULTRAFINE TITANIA PARTICLES

Yu Xibin, Wang Guihua, Luo Yanqing, Li Hexing (Department of Chemistry, Shanghai Normal University, Shanghai 200234)  
TiO 2 sol particles (5~10 nm) was prepared by hydrolysis of Ti(OBu) 4. The ultrafine particles were thermally treated at different temperatures from 473 K to 1?073 K. The results of XRD and Raman spectroscopy showed that the samples in the form of ultrafine particles ( ca 10~20 nm) obtained at lower pH hydrolytic condition with Ti(OBu) 4 as the precursor treated at temperature lower than 673 K were irregular anatase crystal, and the quantum size effect was observed. The TiO 2 particle size was increased with the increase of the treatment temperature. When the treatment temperature increased up to 873 K, the samples obtained become a mixture of anatase phase and rutile phase and the particle size was increased to ca 30 nm. The red shifting in Raman spectra for the TiO 2 samples with small crystalline size was found. That red shifting was also observed with the increase of the rutile phase in the mixed crystalline phase. UV Vis measurements showed that the anatase particles sized less than 20 nm exhibited excellent light absorption capacity and photocatalytic performance. The porous particles with big size are prepared in high pH hydrolytic condition. The porous particles have higher crystallization temperature than TiO 2 ultrafine particles, and have low effective light absorption capacity and photocatalytic performance owing to their UV light scattering.
【Fund】: 上海市教委科技发展基金
【CateGory Index】: O644.1
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