The automated nebulizer spray pyrolysis technique was used to synthesize porous SnO2 bilayer thin films as well as doped porous SnO2 bilayer thin films with varying zinc doping percentages. The synthesized thin films were characterized using X-ray diffraction, field emission scanning electron microscopy, energy dispersive analysis of X-rays, UV-Vis spectroscopy, photoluminescence spectroscopy, current-voltage characteristics and gas sensing performance. The effect of doping on sensor response was investigated using various gases and operating temperatures. The optimized Zn-doped porous SnO2/SnO2 gas sensor sample was taken to further gas sensing analysis. The results revealed that the doping of zinc with a porous tin oxide bilayer increases the gas sensor response at low operating temperatures compared to undoped porous tin oxide bilayers and it also reduces the response recovery time of the sensor. The response of the sensor in a CO gas concentration of 400 ppm has been improved with good repeatability.
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Yogasaraswathi et al. (2024) studied this question.
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