Abstract
We report on the methane (CH4) gas sensing activity of zinc oxide (ZnO) nano-platelets (average diameter of 150-200 nm) on Si/SiO2 substrate and synthesized via a thermal annealing process. The structural and morphological aspects of the nanoscale system were analyzed by electron microscopy, X-ray diffraction, and energy dispersive spectroscopy which have revealed the growth of the randomly oriented hexagonal wurtzite structure in the form of nanoplatelets. The sensor response was studied for different concentrations of methane gas (0.1% to 1%) at different operating temperatures ranging from 70 to 200 ◦C. With a sustainable magnitude of sensor response as high as 75%, the optimal temperature range was evidently between 150 and 200 ◦C. More quantitative studies with regard to sensor efficiency would provide insight as to how ZnO nanoplatelets could be more promising over conventional oxide candidates that use dopants or catalyzing agents.
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