Preparation of hollow dipyramid TiO2 with truncated structure using an oxidation/etch method and its gas-sensing properties

• Published in: Crystal research and technology (1979) 2014-05, Vol.49 (5), p.331-337
• Main Authors: Huang, Fei, Yan, Ai-Hua, Fu, Zheng-Yi, Zhang, Fan, Wang, Yue-Hua, Yin, Shi-Bin, Qiang, Ying-Huai
• Format: Article
• Language: English
• Subjects: formation mechanism; gas-sensing properties; Hollow dipyramid TiO2; hydrothermal approach
• ISSN: 0232-1300; 1521-4079
• DOI: 10.1002/crat.201400017

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 °C could be obtained. Hollow dipyramid titanium dioxide with truncated structure was synthesized by a facile hydrothermal approach in an aqueous solution of hydrofluoric acid and hydrogen peroxide. Raman spectrum shows that the main phase is anatase titanium dioxide, accompanied by small amount of rutile titanium dioxide. Sensing properties show that the desirable sensing characteristics with a sensitivity of about 2.1 towards 5 ppm ethanol gas at 200 oC could be obtained.