Characterization of CoTiO3 Nanocrystallites Prepared by Homogeneous Precipitation Method

Authors	Ming-Wei Li¹, Xiao-Mei Gao¹, Yin-Ling Hou¹, Cheng-Yang Wang²
Affiliations	¹ School of Science, Tianjin University, Tianjin 300072, China ² School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Е-mail	mingweili@tju.edu.cn
Issue	Volume 5, Year 2013, Number 3
Dates	Received 12 May 2013; revised manuscript received 01 July 2013; published online 12 July 2013
Citation	Ming-Wei Li, Xiao-Mei Gao, Yin-Ling Hou, Cheng-Yang Wang, J. Nano- Electron. Phys. 5 No 3, 03022 (2013)
DOI
PACS Number(s)	61.46. ± w, 78.67. ± n, 71.20.Nr
Keywords	Cobalt titanate, Nanocrystalline materials (2) , Microstructure (21) , Optical property (2) .
Annotation	Nanocrystalline cobalt titanate (CoTiO3) has been synthesized from a well-mixed precursor. The precursor was prepared by a homogeneous precipitation method, in which urea was used as the precipitator. The as-synthesized sample is a mixture of CoTiO3 and rutile nanocrystallites with mean sizes of around 50 nm. It strongly absorbs visible light in the wavelength range of 500-690 nm besides ultraviolet light (wavelength < 370 nm). We found the synthetic CoTiO3 is a semiconducting material with a direct band gap of 2.53 eV. The green CoTiO3 has two absorbance peaks at the wavelengths of 537 and 606 nm, which correspond to the photon energies of 2.31 and 2.05 eV, respectively.
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