Optical and electrical properties of TiO2 nanotubes grown by titanium anodization

Yahya Alivov, Vladimir Kuryatkov, Mahesh Pandikunta, Gautam Rajanna, D. Johnstone, Ayrton Bernussi, Sergey Nikishin, Z. Y. Fan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In this work we investigated the structural, electrical, and optical properties of titanium dioxide (TiO2) nanotubes (NTs) formed by electrochemical anodization of Ti metal sheets in NH4F+glycerol electrolyte at different anodization voltages (Va) and acid concentrations. Our results revealed that TiO2 NTs can be grown in a wide range of anodization voltages from 10 V to 240 V. The maximum NH 4F acid concentration, at which NTs can be formed, decreases with the anodization voltage, which is 0.7% for Va<60V, and decreases to 0.1% at Va =240 V. Glancing angle X-ray diffraction (GAXRD) experiments show that as-grown amorphous TiO2 transforms to anatase phase after annealing at 400°C, and further transforms to rutile phase at annealing temperatures above 500°C. Samples grown in 30-120 voltage range have higher crystal quality as seen from anatase (101) peak intensity and reduced linewidth. The electrical resistivity of the NTs varies with V a concentration and increases by eight orders of magnitude when Va increases from 10 V to 240 V. This is consistent with cathodoluminescense studies which showed improved optical properties for samples grown in this voltage range. Optical properties of samples were also studied by low temperature photoluminescence. Temperature dependent I-V and photo-induced current transient spectroscopy were employed to analyze electrical properties and defect structure on NT samples.

Original languageEnglish
Title of host publicationSemiconductor Nanowires - Growth, Size-Dependent Properties and Applications
PublisherMaterials Research Society
Pages85-90
Number of pages6
ISBN (Print)9781617383977
DOIs
StatePublished - 2009
Event2009 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 13 2009Apr 17 2009

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1178
ISSN (Print)0272-9172

Conference

Conference2009 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period04/13/0904/17/09

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