1. TiO 2 nanocrystal incorporated with CuO and its optical properties
- Author
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Xuan Nghia Nguyen, Thanh Van Hoang, Ngoc Tai Ly, Hung Manh Do, Van Chien Nguyen, Minh Hong Nguyen, Dang Thanh Tran, Thi Hong Le Ngo, Van Hong Le, Quang Huy Le, Thi Hoa Dao, and Dinh Lam Vu
- Subjects
Anatase ,Copper oxide ,Materials science ,Band gap ,Inorganic chemistry ,Analytical chemistry ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,Nanocrystal ,Absorption edge ,chemistry ,General Materials Science ,Electrical and Electronic Engineering ,Absorption (electromagnetic radiation) ,Photocatalytic water splitting ,Visible spectrum - Abstract
TiO2 nanocrystal doped with Cu has been fabricated by wet chemical processing. The obtained results of x-ray diffraction, optical absorption in the UV–Vis bands and luminescence spectra have shown that Cu has substituted Ti in the structure of TiO2 anatase phase when the Cu concentration is about 8 at%. In the case of larger Cu concentrations the copper oxide appeared and increased with increasing Cu concentration. The samples doped with Cu strongly absorb the visible light (400–900 nm) and their absorption edge shifts to the longer wavelength in dependence on the Cu concentration. The absorption in the visible light band is attributed to transitions between the impurities levels of Cu created in the energy band gap of TiO2. In addition, an absorption shoulder above 800 nm is observed and supposed to be related with the absorption of CuO. The experimental results prove that the TiO2 anatase doped with Cu is suitable for hydrogen generation by photocatalytic water splitting under sunlight.
- Published
- 2012