H_2S Gas Sensor Based on Nanocrystalline ZnO Synthesized by Electrochemical-Deposition

摘要

ZnO nanocrystals were prepared by a direct current electrochemical deposition process under 3.0 V working voltage and 30 A/m~2 current density using zinc sulfate as raw materials. The nanocrystals were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicated that the nanocrystals are hexagonal wurtzite ZnO with particle size range of 25 nm～40 nm without any treating. Gas sensing properties of the sensors were tested by mixing a gas in air at static state; the tested results showed that the sensors based on nanocrystalline ZnO had satisfied gas sensing properties to H_2S gas at rather low temperature.