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Annealing effects on the photoresponse of TiO2nanotubes

✍ Scribed by Ghicov, Andrei ;Tsuchiya, Hiroaki ;Macak, Jan M. ;Schmuki, Patrik

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
355 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The present work investigates the influence of different annealing treatments on the photoresponse of electrochemically formed TiO~2~ nanotubes. The β€œas prepared” TiO~2~ nanotube layers have an amorphous structure and show a comparably low photocurrent magnitude. Annealing the tubes in air or dry Ar at 450 Β°C converts the structure to anatase and increases strongly the photocurrent conversion efficiencies. Significant differences between annealing in air and in dry Ar were found. Annealing in Ar results in green layers that show lower photon to current efficiencies than the layers annealed in air. Extended annealing in Ar at 450 Β°C leads to morphological changes of the nanotube structure. These differences in the behaviour (photoresponse and mechanical stability) are attributed to the reductive nature of the Ar environment (leading to a partial reduction and vacancy formation). (Β© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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TiO2 Nanotubes – Annealing Effects on De
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## Abstract The present work deals with self‐organized TiO~2~ nanotube layers formed on a Ti metal substrate by anodization. For virtually any electrical or photoelectric application, these originally amorphous nanotube layers need to be converted to anatase. Most frequently, this is done by anneal