Abstract
Tin-doped zinc oxide nanorods (Sn:ZnO NRs) were prepared on magnesium (Mg)–aluminum (Al) co-doped ZnO seeded layer-coated glass substrate using low-temperature solution immersion for ethanol gas sensor applications. The crystallite size, diameter size, and thickness of Sn:ZnO NRs were found to be 46, 84, and 480 nm, respectively; these values were smaller than the values of those of undoped ZnO nanorods (ZnO NRs). Sn:ZnO NRs exhibited a hexagonal-shape structure with c-axis orientation. Sn:ZnO NRs also presented compressive strain and tensile stress with values of −1.61% and 3.75 GPa, respectively. The ethanol gas sensor based on Sn:ZnO NRs obtained a response of 3.8 and response/recovery times of 75 s/53 s to ethanol gas (240 ppm) at 100 °C; thus, Sn:ZnO NRs produced better sensing performance than ZnO NRs. Results demonstrate that Sn:ZnO NRs are very promising in fabricating ethanol gas sensors with high response at low operating temperature.
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