The correlation between the substrate temperature and morphological ZnO nanostructures for H2S gas sensors

In this work, different ZnO nanostructures are prepared by carbothermal evaporation method on quartz substrates at various deposition temperatures. The mixture powders ZnO/C with 1:1 ratio as a source of materials inserted in the center of furnace tube. The effect of temperature, by keeping constant other parameters, on growth and morphological surface are investigated which is an important parameter for gas sensing. The crystalline structure of Zn is verified by X-ray diffraction and the surface morphology is analyzed by scanning electron microscopy. The results showed that the sensitivity of sensor synthesized at temperature of 500 degrees C and operated at 300 degrees C for 20 ppm H2S gas, is 80% with 35 s and 390 s for recovery and response time, respectively. (C) 2013 Elsevier B.V. All rights reserved.