Modification Of Tio2 For Enhanced Surface Properties: Finite Ostwald Ripening By A Microwave Hydrothermal Process

Wilson, Gregory J., Matijasevich, Aaron, Mitchell, David R. G., Schulz, Jamie C., & Will, Geoffrey (2006) Modification Of Tio2 For Enhanced Surface Properties: Finite Ostwald Ripening By A Microwave Hydrothermal Process. Langmuir, 22(5), pp. 2016-2027.

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Abstract

The effect of microwave modification of colloidal TiO2 suspensions under extended periods of treatment is presented. The nanoparticulate TiO2 is compared and contrasted to similar convection hydrothermally treated TiO2 and a commercial titania product, namely Degussa P25. Microwave-treated samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy to determine their physicochemical characteristics. Comparative surface area analyses were performed by N2 adsorption and calculated from a Brunauer-Emmett-Teller (BET) isotherm. The complementary techniques of XRD and TEM showed good correlation between observed and calculated particle sizes (by application of the Scherrer equation), with the material being highly crystalline anatase TiO2, as identified by XRD and Raman. This investigation identified that extended periods of microwave hydrothermal treatment do not greatly enhance the crystallinity and primary grain size. Treatment of >180 min has a negative effect on crystallite growth; however, treatment up to this time had a significant effect on the material's surface area. The limiting regime of Ostwald ripening for hydrothermal treatment is discussed in relation to the mechanism of microwave treatment, that is, rapid heating to temperature and extremely rapid rates of crystallization. The effect of these property modifications are further discussed in relation to photocatalytic and photoelectrochemical applications of TiO2 nanoparticles.

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ID Code: 10500
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/la052716j
ISSN: 0743-7463
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Americal Chemical Society
Copyright Statement: The contents of this journal can be freely accessed online via the ACS web page 12 months after publication. See link to ACS website.
Deposited On: 30 Oct 2007 00:00
Last Modified: 29 Feb 2012 13:30

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