Abstract
Molybdenum oxide thin films were prepared electrochemically onto the selenium predeposited tin oxide-coated glass substrates using 0.22 M sodium citrate (C6H5Na3O7) solution (pH 8.3) and sodium molybdate as a precursor. Cyclic voltammetry was used to determine the deposition potential effects on molybdenum compound speciation, while quantitative thin film composition was obtained from X-ray photoelectron spectroscopy depth profiles. Thin molybdenum film growth and composition was potential dependant. Predominant molybdenum species was Mo(IV) at all deposition potentials and deposition times. Optical properties of the molybdenum oxide thin films were determined using UV–VIS spectroscopy. The absorption edge varied between 560 and 650 nm, whereas optical band gap values—between 1.79 and 2.19 eV—well within the limits for solar light-induced chemical reactions.
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Acknowledgments
The authors gratefully acknowledge National Science Foundation grant CHE 0320387, the Central Microscopy Research Facility (CMRF) at the University of Iowa, and Kenneth Moore, Director of CMRF, for access to the XPS and SEM.
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Sinkeviciute, D., Baltrusaitis, J. & Dukstiene, N. Layered molybdenum oxide thin films electrodeposited from sodium citrate electrolyte solution. J Solid State Electrochem 15, 711–723 (2011). https://doi.org/10.1007/s10008-010-1137-2
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DOI: https://doi.org/10.1007/s10008-010-1137-2