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Zinc oxide (ZnO) nanostructures were synthesized through the hydrothermal method at various conditions growth
times (6,7 and 8 hrs.) and a growth temperature (70, 90, and 100 ºC). The prepared ZnO nanostructure samples were
described using scanning electron microscopy (SEM) and X-ray diffractometer to distinguish their surface morphologies
and crystal structures. The ZnO samples were confirmed to have the same crystal type, with different densities and
dimensions (diameter and length). The obtained ZnO nanostructures were used to manufacture gas sensors for NO2 gas
detection. Sensing characteristics for the fabricated sensor to NO2 gas were examined at different operating temperatures
(180, 200, 220, and 240) ºC with a low gas concentrati
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