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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 7
BKCSDE 33(7)
July 20, 2012 

Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO2 Nanotubes Aggregation
Feila Liu, Lu Lu, Peng Xiao, Huichao He, Lei Qiao, Yunhuai Zhang*
Aggregation of TiO2 nanotubes, Annealing treatment, Oxygen vacancies, Photocatalysis
Aggregation of titania nanotubes (TNTs) fabricated by hydrothermal method were calcined in air and dry nitrogen; Changes in morphology and crystallinity of the nanotubes were studied by means of TEM, EDX, and XPS. EDX patterns and XPS spectra proved that there were a certain densities of oxygen vacancies in TNTs annealed in N2. The photocatalysis experiments revealed TNTs/N2 possesses significantly higher photocatalytic efficiency than TNTs annealed in dry air to degrade methylene blue. The correlation between oxygen vacancies and photocatalytic property may be attributed to: 1) oxygen vacancies might have affected results on water molecules adsorption and increase of the hydroxyl concentration; and 2) oxygen vacancies resulted in some changes in electronic structure of TNTs/N2 aggregation and Fermi level extends into the conducting band.
2255 - 2259
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