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4293662 
Journal Article 
Preparation of hollow dipyramid TiO2 with truncated structure using an oxidation/etch method and its gas-sensing properties 
Huang, Fei; Yan, AiHua; Fu, ZYi; Zhang, Fan; Wang, YueHua; Yin, ShiBin; Qiang, YH 
2014 
Yes 
Crystal Research and Technology
ISSN: 0232-1300 
49 
5 
331-337 
WOS:000335519000008 
Hollow dipyramid titanium dioxide with truncated structure was synthesized by a facile hydrothermal approach in an aqueous solution of hydrofluoric acid and hydrogen peroxide. The critical oxygen from the decomposition of hydrogen peroxide has been investigated in detail. X-ray diffraction and Raman measurements show that the main phase is anatase titanium dioxide, accompanied by a small amount of rutile titanium dioxide. The formation mechanism is proposed based on oxygen release, oxidation, etching and hydrolyzation. The sensing properties of such a hollow dipyramid titanium dioxide sensor show that the desirable sensing characteristics with a sensitivity of about 2.1 towards 5 ppm ethanol gas at 200 degrees C could be obtained. 
Hollow dipyramid TiO2; hydrothermal approach; formation mechanism; gas-sensing properties