Iranian Journal of Physics Research

Solid state sensor of zinc oxide nanorods for methane gas detection at room temperature

Document Type : Original Article

Authors

Sh Nasirian
S Karder

Department of Electrical and Computer Engineering, Mazandaran University of Science and Technology, Babol, Iran

https://doi.org/10.47176/ijpr.20.2.35771
Abstract
In present work, zinc oxide (ZnO) nanorods were synthesized by a simple hydrothermal method and its methane gas sensing features was studied under different gas concentrations and various relative humidity at room temperature. ZnO nanorods characterization investigated by X-ray diffraction (XRD) and Field effect scanning electron microscopy (FE-SEM). The results were showed the wurtzite phase of the crystallized hexagonal structure with porous architecture. A high response of 77.1% was obtained under 0.15 vol% methane gas concentration at 30% relative humidity, while a low response of 32.2% was achieved toward 0.037 vol% methane gas level at 90% relative humidity. Moreover, the low response/recovery time of 95.4/45.9 s was obtained under 0.15 vol% gas concentration. The solid state sensor of the ZnO nanorods displayed high response and good selectivity to methane gas than that other air components at environmental conditions. Finally, the methane gas sensing mechanism of the ZnO nanorods sensor was discussed as well.

Keywords

zinc oxide nanorods
gas sensor
methane gas
room temperature
relative humidity
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