Abstract
A compound material of multi-walled carbon nanotubes (MWCNTs) coated with ZnO was synthesized at ambient conditions. The X-ray diffraction, UV–visible spectroscopy, scanning electron microscope (SEM) and transmission electron microscopy results confirmed that the existence of ZnO nanoparticles inside the MWCNTs. The gas sensing properties of the material were studied. ZnO-based composites on MWCNTs treated at room temperature shows enhanced performance as sensors, making them suitable for practical applications. Sensor structure showed a better sensing response (S ~61.57) at operating room temperature towards 1500 ppm LPG with an average sensitivity 41.95. Furthermore, the gas sensor responses increased linearly with the increment of the gas concentrations of LPG.
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