Solar-light photoamperometric and photocatalytic properties of quasi-transparent TiO2 nanoporous thin films

Yajun Ji, Keng Chu Lin, Hegen Zheng, Chung Chiun Liu, Laurie Dudik, Junjie Zhu, Clemens Burda

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Transparent photocatalytic surfaces are of ever increasing importance for many applications on self-cleaning windows and tiles in everyday applications. Here, we report the formation and photocatalytic testing of a quasi-transparent thin and nanoporous titania films deposited on glass plates. Sputtered Ti thin films were anodized in fluoride-ion-containing neutral electrolytes to form optically semitransparent nanoporous films, which transformed to be completely transparent after thermal annealing. The nanoporous films were studied at different stages, such as before and after anodization, as well as after thermal annealing using scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-vis and Raman spectroscopy. It was observed that anodization at 20 V of high-temperature deposited titanium films resulted in regular nanopore films with pore diameters of 30 nm. Structural investigations on the transparent nanopore arrays reveal the presence of anatase phase TiO2 even after annealing at 500 °C, which was confirmed by XRD and Raman spectroscopy measurements. The solar-light induced photocatalytic decomposition of stearic acid and photoconductivity characteristics of these nanoporous thin films are also presented.

Original languageEnglish
Pages (from-to)3075-3082
Number of pages8
JournalACS Applied Materials and Interfaces
Volume2
Issue number11
DOIs
StatePublished - 24 Nov 2010

Keywords

  • photocatalysis
  • photocurrent
  • thin film
  • titania nanopores

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