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Structural and optical properties of pure SnO2 and V2O5/SnO2 nanocomposite thin films for gas sensing application
Ist Teil von
Journal of materials science. Materials in electronics, 2020-09, Vol.31 (18), p.15477-15488
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2020
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
In this study, pure SnO
2
and V
2
O
5
/SnO
2
nanocomposite thin film NH
3
sensors with varying V
2
O
5
contents were successfully prepared by spray pyrolysis method. The prepared thin films were characterized by X-ray diffraction, Field emission scanning electron microscopy, Energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, stylus profilometry and Ultra violet–Visible and transmittance spectroscopies. NH
3
gas sensing property was also studied. XRD results suggested that all the thin films exhibited a tetragonal rutile crystal structure, while the average crystallite size increases with V
2
O
5
content. FESEM images of the thin films showed the presence of both nano and micro-sized grains in the range ~ 53–194 nm. EDX spectra confirmed the inclusion of V
2
O
5
into the SnO
2
matrix. The vibrational bands associated with the thin films were verified from the FTIR spectra. Thickness measurements revealed that the thickness increases with V
2
O
5
content. Change in transparency and bandgap narrowing were also noticed from the transmittance and UV–Vis spectra. NH
3
gas sensing measurements suggested that the transient resistance of V
2
O
5
/SnO
2
thin film was lower than pure SnO
2
. Further, in the operating temperature 300 °C and 100 ppm NH3 gas, the sensor response of V
2
O
5
/ SnO
2
thin film (99.13) is found to be higher than pure SnO
2
thin film (92.34). Also, the response and recovery times of pure SnO
2
thin film (30 and 44 s) are lower than V
2
O
5
/SnO
2
thin film (39 and 180 s). These results indicate that V
2
O
5
/SnO
2
thin film could serve as a suitable material for NH
3
gas sensing application.