Abstract
Highly crystalline pure and Mo-doped (doping at different concentrations) BiVO4 thin films were deposited on glass substrates using the chemical spray pyrolysis technique. The doping concentration greatly influenced the film's crystallite size and surface roughness. The higher the dopant concentration, the smaller the crystallite size and the higher the surface roughness. All the films were sensitive to ammonia gas. Of all the films tested for gas sensing, the Bi1-0.05Mo0.05VO4 had a higher response to ammonia at room temperature. The introduction of dopant also reduced the bandgap of BiVO4. Peak shifts in Raman bands were also observed on doping with Mo. The lattice strain and dislocations imposed by the Mo dopant resulted in higher sensor response for the films at room temperature.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We acknowledge Dr. Goran Majkic and the University of Houston Division of Research High Priority Area Research Large Equipment Grant I0503304 for establishing a state-of-the-art 2D-XRD facility used in this study. We greatly appreciated the kind help of Dr. Wayne Fei and Dr. Shawn Liu from Houston Electron Microscopy (HoustonEM.com) for guiding and offering Vasundhra the use of their state-of-the-art 3-D Digital Microscope and Scanning Electron Microscope.
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Conceptualization: VA, SK. Formal analysis: VA, SK. Investigation: VA, SK. Methodology: VA. Resources: SK. Supervision: SK. Validation: SK. Writing—original draft: VA. Writing—review & editing: VA, SK.
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Arulazi, V., Kalainathan, S. Molybdenum-doped BiVO4 thin films deposited through chemical spray pyrolysis for ammonia sensing at room temperature. J Mater Sci: Mater Electron 35, 347 (2024). https://doi.org/10.1007/s10854-024-12088-4
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DOI: https://doi.org/10.1007/s10854-024-12088-4