Implications of precursor chemistry on the alkaline hydrothermal synthesis of titania/titanate nanostructures

Morgan, Dana L. and Liu, Hong-Wei and Frost, Ray L. and Waclawik, Eric R. (2010) Implications of precursor chemistry on the alkaline hydrothermal synthesis of titania/titanate nanostructures. Journal of Physical Chemistry C : Nanomaterials and Interfaces, 114(1). pp. 101-110.

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DOI: 10.1021/jp908508z

Official URL: http://pubs.acs.org/doi/full/10.1021/jp908508z?coo...

Abstract

A systematic study of four parameters within the alkaline hydrothermal treatment of three commercial titania powders—anatase, rutile, and Degussa P25—was made. These powders were treated with 5, 7.5, 9, and 10 M NaOH between 100 and 220 °C for 20 h. The effects of alkaline concentration, hydrothermal temperature, and precursor phase and crystallite size on the resultant nanostructure formation have been studied through X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and nitrogen adsorption. Through the correlation of these data, morphological phase diagrams were constructed for each commercial powder. Interpretation of the resultant morphological phase diagrams indicates that alkaline concentration and hydrothermal temperature affect nanostructure formation independently, where nanoribbon formation is significantly influenced by temperature for initial formation. The phase and crystallite size of the precursor also significantly influenced nanostructure formation, with rutile displaying a slower rate of precursor consumption compared with anatase. Small crystallite titania precursors formed nanostructures at reduced hydrothermal temperatures.

ID Code:	29617
Item Type:	Journal Article
Keywords:	titania nanotube, layered titanate , hydrothermal synthesis, phase diagram
ISSN:	1932-7447
Subjects:	Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Physical Chemistry of Materials (030304) Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Solid State Chemistry (030206) Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Synthesis of Materials (030306)
Divisions:	Schools > School of Physical and Chemical Sciences QUT Faculties and Divisions > Faculty of Science and Technology Institutes > Institute for Sustainable Resources
Copyright Owner:	Copyright 2010 American Chemical Society
Deposited On:	13 Jan 2010 12:21
Last Modified:	14 Jan 2010 01:55

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