Abstract
In this work, tin sulfide:samarium oxide (SnS:Sm2O3) composite films were deposited using a spray pyrolysis technique for room-temperature CO2 gas sensing. X-ray diffraction (XRD) confirmed a polycrystalline SnS nature of orthorhombic-phase crystallinity at 10 at.% Sm ions, while 20 at.% Sm induced Sm2O3 as a separate phase. Field emission-scanning electron microscopy (FE-SEM) induced uniform grains and increased the surface roughness, enhancing gas adsorption. UV-visible absorbance revealed band-gap narrowing. Fourier transform infrared spectroscopy (FTIR) analysis revealed vibrational band shifts, confirming the structural modifications. Gas-sensing measurements demonstrated 5.72%, 19.65%, and 9.65% for pure SnS, 10 at.% and 20 at.% Sm films sensitivity values, respectively, against 500 ppm CO2 at room temperature. The minimum response and recovery times were 11 s and 13 s, respectively, for the same sample. These results demonstrate that SnS:Sm2O3 composite films prepared by a simple spray pyrolysis method present a simple and practical method for a room-temperature CO2 gas sensor with enhanced sensitivity and fast response dynamics, in contrast to pure SnS which shows low sensitivity toward CO2.
Recommended Citation
Khalaf, Wasan A.; Hammadi, Mays A.; AlSultani, Mohammed J.; Hathal, Yahya R.; and Salman, Mohammed O.
(2026)
"Optimized CO2 Gas Sensing with SnS:Sm2O3/n-Si Nanocomposites Fabricated via Spray Pyrolysis,"
Karbala International Journal of Modern Science: Vol. 12
:
Iss.
1
, Article 6.
Available at:
https://doi.org/10.33640/2405-609X.3441
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