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Nanotubes Patterned Thin Films of Barium-strontium Titanate

Published online by Cambridge University Press:  01 August 2005

Xuezheng Wei ,
Alexander L. Vasiliev  and
Nitin P. Padture
Xuezheng Wei
Affiliation:
Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269-3136
Alexander L. Vasiliev
Affiliation:
Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269-3136
Nitin P. Padture*
Affiliation:
Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269-3136
*
a) Address all correspondence to this author. e-mail: [email protected] Present address: Department of Materials Science and Engineering, Ohio State University, Columbus, OH 43210-1178. This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/jmr/policy.html.
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Abstract

A novel, low-temperature synthesis method for producing BaxSr(1−x)TiO3 (BST) thin films patterned in the form of nanotubes (“honeycomb”) on Ti substrates is reported. In this two-step method, the Ti substrate is first anodized to produce a surface layer (∼300 nm thickness) of amorphous titanium oxide nanotube (∼100 nm diameter) arrays. In the second step, the anodized substrate is subjected to hydrothermal treatment in aqueous Ba(OH)2 + Sr(OH)2 at 200 °C, where the nanotube arrays serve as templates for their topotactic (shape-preserving) hydrothermal conversion to polycrystalline BST nanotubes. A simple geometrical model is proposed to elucidate the mechanism of the hydrothermal growth of BST nanotubes. This opens the possibility of tailoring the titanium oxide nanotube arrays and of using various precursor solutions and their combinations in the hydrothermal bath to produce ordered, patterned thin-film structures of various Ti-containing ceramics. These could find use not only in a variety of electronic, optoelectronic, and sensor device applications but also in biomedical and catalysis applications, where patterned thin films are desirable.

Keywords

CeramicHydrothermalThin film
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 2140 - 2147
Copyright
Copyright © Materials Research Society 2005

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References

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