Preparation And Gas Properties Of ZnO Nano-chip Network And Field Structure And Ge Nanorod Arrays Launch

ZnO nanodisk networks have been directly grown on Au electrodes by low temperature through an in situ growth process. Gas sensing property of ZnO nanodisk network sensor has been compared with the ZnO nanorod sensor which made by the similar production process without InCl3·4H2O. The ZnO nanodisk network sensor has enhanced gas-sensing property, on this basis, we propose the exposed (0001) facet of hexagonal phase ZnO has more excellent catalysis activity in gas-sensing. Ge nanorod arrays have been synthesized by reduction of GeO2in H2atmosphere, the role of In powder on the growth of nanorod has been studied. The field emission property of Ge nanorod arrays has been investigated, these research results would lay the foundation of further research on synthesis of ZnO and Ge nanostructures and their applications in gas sensor and field emission devices. The details are as follow:(1) Different ZnO nanodisk network sensors with Au electrodes and their gas-sensing characteristics:ZnO nanodisk networks were grown in Au comb-shaped interdigitating electrodes by thermal evaporation of a mixture of ZnCl2and InCl3·4H2O at450℃in air. ZnO nanodisks were bridged across the trenched electrodes. In this process, the synthesis of products and fabrication of gas sensors are merged in one step, which is very simple and convenient. Gas-sensing property of nanodisk networks and nanorods has been compared for NH3, C2H5OH and N(C2H5)3detection at300℃, and the grown ZnO nanodisk networks had enhanced performance, due to the specific surface area of nanodisk networks and nanorods is13.70m2/g and16.11m2/g, respectively, lower surface area has a better gas-sensing response, we proposed the reason is nanodisk networks have more (0001) facets than nanorods, the ZnO (0001) facet of hexagonal phase has more excellent catalysis activity in gas-sensing. Moreover, ZnO nanodisk networks also have been deposited on a pair of Au electrodes, the influnce of the distance between two electrodes to their gas-sensing property has been investigated.(2) Synthesis and field emission properties of Ge nanorod arrays:Ge nanorod arrays have been synthesized on the surface of Si substrate by heating GeO2powders with In powders at600℃under the flow of H2. The products were characterized by SEM, EDS and XRD. The results showed that Ge nanorod arrays were single crystalline with the cubic structure. The roles of In powders in the formation of Ge nanorod arrays has been investigated. The growth mechanism is briefly discussed. The field emission property of Ge nanorod arrays were studied at room temperature and compared with the nanorods made by similar process without In powder. The Ge nanorod arrays are promising candidate in future field-emission-based device applications.(3) Synthesis and field emission properties of Ge hierarchical nanostructure: Ge hierarchical nanostructure have been synthesized on the surface of Si substrate by heating GeO2powders with In powders at600℃under the flow of H2. The products were characterized by SEM and XRD. The results showed that Ge hierarchical nanostructure were single crystalline with the cubic structure. The photocatalytic property of Ge herachical nanostructure were studied at room temperature. The results indicate the photocatalytic activity of Ge herachical nanostructure in the photode-gradation of acid naphthol red. Ge herachical nanostructure has potential application in photocatalytic.