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Transparent-conducting, gas-sensing nanostructures (nanotubes, nanowires, and thin films) of titanium oxide synthesized at near-ambient conditions

Published online by Cambridge University Press:  03 March 2011

Jing-Jong Shyue ,
Rebecca E. Cochran  and
Nitin P. Padture
Jing-Jong Shyue
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Rebecca E. Cochran
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
Nitin P. Padture*
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
*
b) Address all correspondence to this author. e-mail: padture.1@osu.edu 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/jmr_policy
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Abstract

A template-based, electroless wet-chemical method for synthesis of nanotubes and nanowires of nanocrystalline anatase titanium oxide (titania) at 45 °C is reported. Single-nanowire electrical property measurements reveal low dc resistivities (7–21 × 10−4 Ω cm) in these titania nanowires. In the presence of 1000 parts per million of CO gas at 100 °C, the resistivity is found to increase reversibly, indicating low-temperature gas-sensing capability in these titania nanowires. Thin films of nanocrystalline anatase titania, deposited using a similar wet-chemical method, also have low room-temperature dc resistivities (6–8 × 10−3 Ω cm), and they are transparent to visible light. Nanostructure-properties relations, together with possible electrical conduction, optical absorption, and gas-sensing mechanisms, are discussed. The ability to fashion transparent-conducting and gas-sensing nanocrystalline anatase titania into nanotubes/nanowires and thin films at near-ambient conditions could open a wider field of applications for titania, including nanoelectronics, chemical sensing, solar cells, large-area windows and displays, invisible security circuits, and incorporation of biomolecules and temperature-sensitive moieties.

Keywords

Chemical synthesisElectronic materialNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 11 , November 2006 , pp. 2894 - 2903
Copyright
Copyright © Materials Research Society 2006

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