Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/2005
Title: Aqueous colloidal sol-gel route to synthesize nanosized ceria-doped titania having high surface area and increased anatase phase stability
Authors: Pradeepan, P
Baiju, K V
Mukundan, P
Krishna Pillai, P
Warrier, K G K
Keywords: Sol–gel
Titanium oxide
Anatase
Ceria doping
Issue Date: 2007
Publisher: Springer
Citation: Journal of Sol-Gel Science and Technology 43(3):299-304;Sep 2007
Abstract: Nanocrystalline sol-gel derived titania doped with ceria (1, 2, 5 and 10-mole%) has been prepared from titanyl oxysulphate. The titania doped with 5-mole% CeO2 after calcining to 500 degrees C, possesses specific surface area of 97 m(2)g(-1) and has anatase phase stability up to 900 degrees C. Moreover it retains a surface area of 37 m(2) g(-1) at 700 degrees C. In comparison, the undoped calcined material has anatase stability only up to 700 degrees C and specific surface area only 48 m(2) g(-1) and 6 m(2) g(-1) at 500 degrees C and 700 degrees C, respectively. The diffuse reflectance spectra show that, as the cerium content increases, the absorption undergoes a red shift and reaches the visible range. The exceptionally high phase stability, crystallinity and high surface area are due to the extremely fine particle size and effective doping achieved by the specific synthesis method. The results based on X-ray diffraction, specific surface area and diffuse reflectance spectra indicated that the maximum threshold limit of doping is up to a value of 5-mole%.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/2005
ISSN: 0928-0707
Appears in Collections:2007

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