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We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method.X-ray diffraction(XRD),energy-disperse X-ray spectrometry(EDS),scanning electron microscopy(SEM)showed that the as-prepared ZnO calcined at 700℃were micron sphere particles with honeycomb-like structure.In the UV-vis absorbing spectrum,it was observed that there is a new additional absorption band at 260 nm,and it was speculated that the absorption may be caused by defects on the surface and interface of honeycomb-like ZnO.The as-products showed high sensitivity and short response time to sulfured hydrogen gas.These results demonstrate that honeycomb-like ZnO conglomerations are very promising materials for fabricating H_2S gas sensors.
We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method. X- ray diffraction (XRD), energy-disperse X-ray spectrometry (EDS), scanning electron microscopy (SEM) showed that the as -prepared ZnO calcined at 700 ° C were micron sphere particles with honeycomb-like structure. the UV-vis absorbing spectrum, it was observed that there is a new additional absorption band at 260 nm, and it was speculated that the absorption may be caused by defects on the surface and interface of honeycomb-like ZnO. the as-products showed high sensitivity and short response time to sulfured hydrogen gas. these results demonstrate that honeycomb-like ZnO conglomerations are very promising materials for fabricating H_2S gas sensors.