Abstract
One-dimensional (1D) ZnO nanorods with different shapes and high aspect ratio were successfully synthesized using a cetyltrimethylammonium bromide (CTAB)-assisted or sodium dodecyl sulfate (SDS)-assisted hydrothermal process at 90°C for 5h. The surface morphology and structure of nanocrystals were characterized by FE-SEM and XRD. Experimental results showed that the typical morphology of ZnO crystals grown with additive of CTAB was pencil-like rods, while the ZnO crystals grown with SDS showed needle-like rods. The gas sensors had been fabricated using 1D ZnO powders to examine the response towards 40ppm NO2 in the range of operating temperature from 150 oC to 450 oC. Compared with needle-like ZnO crystals, the NO2 gas sensor based on pencil-like ZnO nanostructure had better selectivity at the same gas concentration.
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