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Growth of rutile TiO2 nanorods on anatase TiO2 thin films on Si-based substrates

Published online by Cambridge University Press:  29 June 2011

Jinsong Wu ,
Shihhan Lo ,
Kai Song ,
Baiju K. Vijayan ,
Wenyun Li ,
Kimberly A. Gray  and
Vinayak P. Dravid
Jinsong Wu*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208; and The Northwestern University Atomic and Nanoscale Characterization Experimental Center, Northwestern University, Evanston, Illinois 60208
Shihhan Lo
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
Kai Song
Affiliation:
The Northwestern University Atomic and Nanoscale Characterization Experimental Center, Northwestern University, Evanston, Illinois 60208
Baiju K. Vijayan
Affiliation:
Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208
Wenyun Li
Affiliation:
The Northwestern University Atomic and Nanoscale Characterization Experimental Center, Northwestern University, Evanston, Illinois 60208
Kimberly A. Gray
Affiliation:
Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois60208
Vinayak P. Dravid
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208; and The Northwestern University Atomic and Nanoscale Characterization Experimental Center, Northwestern University, Evanston, Illinois 60208
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Synthesis of titania (TiO2) nanorods on various substrates has recently attracted attention for energy and environmental applications. Herein, we report growth of nanostructured TiO2 on Si(111) and glass borosilicate substrates by a two-step method. A thin film of anatase TiO2 was first laid down by spin coating and annealing, followed by the growth of rutile TiO2 nanorods with a hydrothermal method. To understand the role of the polycrystalline anatase TiO2 seed layer, we selected a relatively high temperature for the hydrothermal reaction, e.g., 175 °C at which no rutile TiO2 nanorods could grow without the precoated anatase TiO2 layer. The morphology and microstructure of both the polycrystalline anatase and rutile nanorod layers were characterized by electron microscopy and x-ray powder diffraction. Such a two-step fabrication method makes it possible to grow TiO2 nanorods on almost any substrate.

Keywords

NanostructureNucleation & growthMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 13 , 14 July 2011 , pp. 1646 - 1652
Copyright
Copyright © Materials Research Society 2011

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