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The Sn-doped CuO nanosheets were synthesized on the surface of ZnO nanorods arrays by a two-step method. The as-prepared samples were investigated by X-ray diffraction (XRD), electron microscopy techniques (SEM and EDS), X-ray photoelectron spectroscopy (XPS), UV–Vis spectroscopy, and evaluation of photoelectric performances. With the increase of [Sn4+]/[Cu2+] concentration ratio, the size and number of CuO nanosheets coated on the surface of ZnO nanorods become smaller, and the surface of ZnO nanorods become more and more rough. When the [Sn4+]/[Cu2+] concentration ratio is 2%, the dark current, photocurrent and photoelectric sensitivity of the prepared Sn-doped CuO@ZnO nanorod arrays composites photoelectric devices are 0.038 µA, 141.52 µA and 3724.2, respectively. In this sense, probing the Sn modified CuO@ZnO nanorod arrays composites can elucidate some useful keys for the development of high photoelectric properties. [ABSTRACT FROM AUTHOR]

The structure model of Al-doped ZnO (001) and (100) surface adsorbing NO2 is constructed. Based on the first-principles method of density functional theory, the energy band, adsorption energy and density of state are calculated using the Castep software package. The Al doping significantly increases the energy and adsorption energy of ZnO(001) and ZnO(100) crystal plane systems, and promotes the transfer of charge from NO2 to ZnO(001) and ZnO(100) surface, which promotes the Fermi energy level to move to the high energy potential, resulting in the decrease of the band gap width, thereby enhancing the adsorption capacity of NO2 gas molecules. [ABSTRACT FROM AUTHOR]