In order to study the ethanol properties of ZnO nanowires,the gas sensor was fabricated with ZnO nanowires synthesized by thermal evaporation of Zn powders with a purity of 99.9%.With methyl cellulose as binding admixture,the heater-typed gas sensor was prepared at different sintering temperatures.The morphology of the product was determinated by SEM.The gas sensitivity of ethanol's vapor was tested.The results reveal that the combination of ZnO nanowires rapidly decreases the ratio of the surface area to the volume with the increase of the sintering temperatures,affecting the senstivity of the gas sensor.When the sintering temperature reaches 500℃,the sensitivity of the gas sensor be comes the highest.

Large scale ZnO nanowries and nanorods have been successfully produced by physical thermally evaporating ZnS powders.The morphology,inside structure and optical properties of ZnO nanowires have been studied by scanning electric microscope,transmission electron microscopy,laser raman spectroscopy and fluorescence spectroscopy.The results show that ZnO nanowire obtained has the hexagonal and single crystal structure.Further more,the ZnO nanowires have preferable light properties and good crystalline.The length of ZnO nanowires is in the range of 2～5μm,with diameter about 60nm.The growth of ZnO nanowires is controlled by VS mechanism.

ZnO nanowires with V tips have been prepared using thermal evaporation by controlling the carrier flow and O2 flow.The room-temperature photoluminescence(PL) and Raman scattering of ZnO nanowires have been investigated.Different from other morphology of ZnO nanowires' PL spectra,broad and intense blue emission from 423 nm to 458 nm and weak green emission at 527 nm were observed for the V tip ZnO nanowires.However,no ultraviolet emission was observed.Compared with the Raman spectra of the ZnO powder,3 cm-1 red shift was observed for ZnO nanowires,which should be attributed to the phonon confinement.