Synthesis of carbon nanotubes/sno2 core-shell nanowires and their gas sensitivity to alcohol

In this paper, we report the synthesis of CNTs/SnO2core-shell composite materials by a novel method. It shows that the SnO2nucleation and growth on the outer wall of CNTs result in the formation of core-shell structure nanowires with uniform layer of parcels. We tested the gas sensitivity of the CNTs/SnO2composites to ethyl alcohol by static method, and found that the introduction of CNTs in the SnO2composite materials results in a decrease in their optimum operating voltage, with the optimum at VH = 3.5 V, and an increase in their gas sensitivity. We also found that as the operating voltage increases, the gas sensing of the CNTs/SnO2composites decreases after at first increasing with the alcohol concentration increases. The sensitivity of the composites to alcohol gradually increases and tends to reach a constant finally. Moreover, the sensitivity reaches the maximum at concentration level of 800 ppm ethyl alcohol. © 2019, Politechnica University of Bucharest. All Rights Reserved.