The Research Of Synthesis, Fluorescence Properties And Alcohol Sensitive Performance Of ZnO Micro/Nano Hierarchical Structures

With the development of nanotechnology, ZnO nanostructure materials have been applied in more and more fields. In recent years, the simple method to prepare various morphologies of ZnO nanostructures have attracted considerable attention. Herein, the ZnO hierarchical structures were synthesized by the simple solution in-situ growth using fiber, copper network and alumina ceramic tube as template, respectively. The prepared structures are coxial, the tube-like hierarchical structures of ZnO nanorod are shell and the template is core.Specific contents as follows:1. The ZnO hierarchical structure was synthesized on the surface of the fiber (cotton fiber, nylon fiber, copper, silver, hair) by the in-situ solution growth. The ZnO nanorods coated on the surface of the fiber and formed tube-like hierarchical structures. By high-temperature calcinate, the fabric fiber (nylon) was successfully removed, and the ZnO hollow tube-like structures were obtained.2. The ZnO hierarchical structure networks were synthesized by using copper network as template. The transmission spectra show that the sample has strong ultraviolet shielding. The band gap of ZnO hierarchical structure is determined to be3.26eV from the optical absorption spectra. The Raman spectra show clearly defect peak at582cm-1. The photoluminescence spectra of the sample exhibit a UV emission at about390nm and a green light emission at about565nm. The green light emission could be caused by oxygen vacancies in ZnO. The ZnO network structure with large specific surface area could have good applications in sensors and solar cells.3. The ZnO nanorod hierarchical structures were successfully grew in-situ on the surface of alumina ceramic tube by the above-mentioned method and were used to fabricate gas sensing device directly. The ZnO nanorods did not fall off clearly in the operating process.The gas sensing characteristics of two samples which grew for1h and2h respectively in the same conditions were tested. The result shows that the two samples both have high response to ethanol. At the same conditions, the1h sample has higher response to300ppm ethanol than the2h sample. It could be reason from that the specific surface area of the1h sample is lager because the nanorods are thinner, about150nm in diameter. These structures and method could be applied to construct high response ZnO sensors.