Microwave-assisted synthesis and characterization of Ti1-xVxO2 (x=0.0-0.10) nanopowders

作者：Luc Huy Hoang^*; Pham Van Hai; Pham Van Hanh; Nguyen Hoang Hai; Chen Xiang Bai; Yang In Sang

来源：Materials Letters, 2011, 65(19-20): 3047-3050.

DOI：10.1016/j.matlet.2011.06.034

• Ti1-xVxO2 nanopowders
• Photocatalysts
• Microwave-assisted synthesis

Ti1-xVxO2 (x = 0.0-0.10) nanopowders were successfully synthesized by a microwave-assisted sol-gel technique and their crystal structure and electronic structure were investigated. The products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM). Raman and UV-Vis spectroscopy. The results revealed that TiO2 powders maintained the anatase phase for calcination temperature below 600 degrees C, but gradually changed to the rutile phase above 800 degrees C. The formation of the rutile phase was completed at 1000 degrees C. For Ti1-xVxO2 (x = 0.05) powders, the phase transformation appeared at 600 degrees C. The absorption edge of Ti1-xVxO2 (x > 0) powders broadened to the visible region with increasing V concentration and a strong visible light absorption was obtained with 10% V doping. V doping and subsequent coexistence of both anatase and rutile phases in our Ti1-xVxO2 nanoparticles are considered to be responsible for the enhanced absorption of visible light up to 800 nm.

• 出版日期2011-10