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Photocatalytic activities of N-doped nano-titanias and titanium nitride

Zhang, Z; Goodall, JBM; Morgan, DJ; Brown, S; Clark, RJH; Knowles, JC; ... Darr, JA; + view all (2009) Photocatalytic activities of N-doped nano-titanias and titanium nitride. J EUR CERAM SOC , 29 (11) 2343 - 2353. 10.1016/j.jeurceramsoc.2009.02.008.

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Abstract

TiO2 doped with various loadings of nitrogen was prepared by nitridation of a nano-TiO2 powder in an ammonia/argon atmosphere at a range of temperatures from 400 to 1100 degrees C. The nano-TiO2 starting powder was produced in a continuous hydrothermal flow synthesis (CHFS) process involving reaction between a flow of supercritical water and an aqueous solution of a titanium salt. The structures of the resulting nanocatalysts were investigated using powder X-ray diffraction (XRD) and Raman spectroscopy. Products ranging from N-doped anatase TiO2 to phase-pure titanium nitride (TiN) were obtained depending on post-synthesis heat-treatment temperature. The results suggest that TiN started forming when the TiO2 was heat-treated at 800 degrees C, and that pure phase TiN was obtained at 1000 degrees C after 5 h nitridation. The amounts and nature of the Ti, O and N at the surface were detemined by X-ray photoelectron spectroscopy (XPS). A shift of the band-gap to lower energy and increasing absorption in the visible light region, were observed by increasing the heat-treatment temperature from 400 to 700 degrees C. (C) 2009 Elsevier Ltd. All rights reserved.

Type:Article
Title:Photocatalytic activities of N-doped nano-titanias and titanium nitride
DOI:10.1016/j.jeurceramsoc.2009.02.008
Keywords:TiO2, Powders-gas phase reaction, Grain growth, Optical properties and continuous hydrothermal flow synthesis, CHEMICAL-VAPOR-DEPOSITION, CONTINUOUS HYDROTHERMAL SYNTHESIS, RAY PHOTOELECTRON-SPECTROSCOPY, INDOOR AIR PURIFICATION, NEAR-CRITICAL WATER, ONE-STEP SYNTHESIS, VISIBLE-LIGHT, THIN-FILMS, TIO2 PHOTOCATALYSTS, SOLID-SOLUTIONS
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Biomaterials and Tissue Engineering
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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