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Carbon quantum dots (C QDs)/ZnO nanoflowers composites were prepared via a simple technical route through which ZnO nanoflowers were prepared by electrospinning-hydrothermal synthesis and dispersed in C QDs solution, then dried at 80 °C. The results indicated that ZnO nanoflowers were well combined with C QDs. The visible light photocatalytic activity of C QDs/ZnO nanoflowers coposite was investigated by degradation of Rhodamine B under visible light irradiation, and it is demonstrated that the photocatalytic performance of this composites was significantly enhanced compared with that of pure ZnO nanoflowers. Furthermore, the unique up-converted photoluminescence behaviour of the carbon dots and the novel 3-D structure of the ZnO were considered as the main reasons of this enhancement. [ABSTRACT FROM AUTHOR]

N-doped CuAlO films were prepared by RF magnetron sputtering on quartz substrates using NO as the N source. N concentration in the films is detected by Auger electron spectroscopy in detail, which confirms that N is indeed incorporated into the films. The optical and electrical properties of transparent conductive N-doped CuAlO films are modulated by the NO flow ratio in sputtering gas. The N-doped films have a visible transmittance of 60-70 % and a high infrared transmittance of ~85 %. The film deposited by using 15 % NO flow ratio with the optimal crystalline is provided with a conductivity of 3.75 × 10 S cm at room temperature, which improves over one order of magnitude compared with the undoped film. The enhanced conductive property is mainly originated from the ionization of acceptor impurities. [ABSTRACT FROM AUTHOR]