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Kinetic mechanism of TiO2 nanocarving via reaction with hydrogen gas

Published online by Cambridge University Press:  01 July 2006

Sehoon Yoo ,
Suliman A. Dregia ,
Sheikh A. Akbar ,
Helene Rick  and
Kenneth H. Sandhage
Sehoon Yoo
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Suliman A. Dregia
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Sheikh A. Akbar*
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Helene Rick
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Kenneth H. Sandhage
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
*
b)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Dense polycrystalline titania (TiO2, rutile) was converted into oriented arrays of single-crystal titania nanofibers by reaction with a noncombustible, hydrogen-bearing gas mixture at only 680–780 °C. Such nanofiber formation resulted from anisotropic etching (“nanocarving”) of the titania grains. The fibers possessed diameters of 20–50 nm and lengths of up to several microns, with the long fiber axes oriented parallel to the [001] crystallographic direction of rutile. Mass spectroscopy and inductively coupled plasma spectroscopy indicated that oxygen, but not titanium, was removed from the specimen during the reaction with hydrogen. The removal of substantial oxygen and solid volume from the reacting surfaces, without an appreciable change in the Ti:O ratio at such surfaces, was consistent with the solid-state diffusion of titanium cations from the surface into the bulk of the specimen. The reaction-induced weight loss followed a parabolic rate law, which was also consistent with a solid-state diffusion-controlled process.

Keywords

Chemical reactionKineticsNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1822 - 1829
Copyright
Copyright © Materials Research Society 2006

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