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Information × Registration Number 0219U100549, 0116U002620 , R & D reports Title Mechanisms of versatile sensors formation on the basis of anisotropic heterojunctions ZnO/Cu2O(CuO) in a form of neural networks nanosystems. popup.stage_title Head Perekrestov Vyacheslav I., Registration Date 19-02-2019 Organization Sumy State University popup.description2  tructure formation of three-dimensional networks based on ZnO, ZnO/CuO and ZnO/NiO nanosystems in the form of fractal percolation systems are studied, as well as their current-voltage characteristics alterations under influence of such gas reagents as H2, CO2, C3H8+C4H10 (LPG), СН3-С(О)-СН3, СН4 or C2H5OH. Mechanisms and regularities of structure formation and physical principles of sensing response are discovered. Specific fundamental task within the general problem, solved during the project, is to uncover interdependence between structural, morphological and gas sensing properties of ZnO, ZnO/CuO and ZnO/NiO nanosystems, on the one side, and such technological parameters as discharge power in the accumulative "plasma-condensate" systems, working gas pressure, ambient gas composition and oxidation temperature of Zn and Cu nanosystems, on the other side. Structural and morphological characteristics, elemental and phase compositions are studied using scanning and transmission electron microscopy, X-ray diffraction, energy dispersive analysis. These results helped to found optimal technological parameters of ZnO, ZnO/CuO, ZnO/NiO nanosystems formation. By investigating current-voltage curve features for fractal-percolation networks of ZnO, ZnO/CuO and ZnO/NiO, the possibility to recognize such gases as C3H8+C4H10 (LPG), СН3-С(О)-СН3, СН4 or C2H5OH is shown. It is suggested that the character of the current-voltage curves dependes on changes of surface adsorption-desorption reactions for various gases, while these reactions result in formation of different cluster configurations, providing charge transfer. The obtained sensors based on ZnO, ZnO/CuO and ZnO/NiO can be used for detection of various gases in air, as well as for temperature and vacuum level measurements. Product Description popup.authors popup.nrat_date 2020-04-02 Close