Temperature dependent surface and spectral modifications of nano V2O5 films

Nanocrystalline V 2 O 5 films have been deposited on glass substrates at 300°C substrate temperature using thermal evaporation technique and were subjected to thermal annealing at different temperatures 350, 400, and 550°C. X-ray diffraction (XRD) spectra exhibit sharper and broader characteristic p...

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Bibliographic Details
Published in:Optics and spectroscopy 2017-03, Vol.122 (3), p.420-425
Main Authors: Manthrammel, M. Aslam, Fatehmulla, A., Al-Dhafiri, A. M., Alshammari, A. S., Khan, Aslam
Format: Article
Language:English
Subjects:
Blue shift
Condensed-Matter Spectroscopy
Crystal defects
Crystallites
Defect annealing
Glass substrates
Lasers
Nanorods
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Red shift
Smart materials
Spectra
Temperature
Temperature dependence
Vanadium oxides
Vanadium pentoxide
Windows (apertures)
X-ray diffraction
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Summary:Nanocrystalline V 2 O 5 films have been deposited on glass substrates at 300°C substrate temperature using thermal evaporation technique and were subjected to thermal annealing at different temperatures 350, 400, and 550°C. X-ray diffraction (XRD) spectra exhibit sharper and broader characteristic peaks respectively indicating the rearrangement of nanocrystallite phases with annealing temperatures. Other phases of vanadium oxides started emerging with the rise in annealing temperature and the sample converted completely to VO 2 (B) phase at 550°C annealing. FESEM images showed an increase in crystallite size with 350 and 400°C annealing temperatures followed by a decrease in crystallite size for the sample annealed at 550°C. Transmission spectra showed an initial redshift of the fundamental band edge with 350 and 400°C while a blue shift for the sample annealed at 550°C, which was in agreement with XRD and SEM results. The films exhibited smart window properties as well as nanorod growth at specific annealing temperatures. Apart from showing the PL and defect related peaks, PL studies also supported the observations made in the transmission spectra.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X1703002X