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Title

Synthesis, characterization, and photoactivity of InTaO4 and In0.9Ni0.1TaO4 thin films prepared by electron evaporation

AuthorsRico, Víctor J. ; Frutos, F.; Yubero, Francisco ; Espinós, J.P. ; González-Elipe, Agustín R.
KeywordsAnnealing
Contact angle
Electrical conductivity
Electron energy loss spectra
Hydrophilicity
Indium compounds
Nickel compounds
Issue Date23-Dec-2009
PublisherAmerican Vacuum Society
CitationJournal of Vacuum Science and Technology - Section A 28(1): 127-134 (2010)
AbstractInTaO4 and In0.9Ni0.1TaO4 thin films have been prepared by electron evaporation of successive layers of the single oxide components and posterior annealing at T>800 °C. The annealed thin films presented the monoclinic crystallographic structure typical of these mixed oxides. The electrical and optical behaviors of the films, assessed by C-V measurements, surface conductivity as a function of temperature, and UV-vis absorption spectroscopy, indicate that these oxides are wide band gap semiconductors with a variable dielectric constant depending on the annealing conditions. By reflection electron energy loss spectroscopy some electronic states have been found in the gap at an energy that is compatible with the activation energy deduced from the conductivity versus 1/T plots for these oxides. The photoactivity of these materials has been assessed by looking to the evolution of the wetting contact angle as a function of the irradiation time. All the films became superhydrophilic when irradiated with UV light, while the In0.9Ni0.1TaO4 thin films also presented a small partial decrease in wetting angle when irradiated with visible photons.
Description8 pages.-- PACS: 68.55.ag; 81.15.-z; 81.40.Gh; 61.72.Cc; 79.20.Uv; 77.22.Ch; 78.40.Ha; 78.66.Li; 73.25.+i; 61.80.Ba; 73.61.Le
Publisher version (URL)http://dx.doi.org/10.1116/1.3273597
URIhttp://hdl.handle.net/10261/21837
DOI10.1116/1.3273597
ISSN0734-2101
Appears in Collections:(ICMS) Artículos
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