Study on optical properties of Ni@ZnO prepared by hydrothermal method

Abstract

The intrinsic nano-ZnO and Ni@ZnO were synthesized with Zn(CH₃COO)₂·2H₂O and NaOH by hydrothermal method under the temperature of 120 °C, and the C₁₉H₄₂BrN(CTAB) was used as surface active agent, Ni(CH₃COO)₂·4H₂O was used as Ni-doped element, and then solution with different reaction concentration is configured. The crystal structure, morphology and fluorescence characteristics of the samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and fluorescence spectrometer (PL) respectively. The results indicate that the samples are pure phase nanocrystals of hexagonal wurtzite structure. With the increase of the doping concentration of Ni²⁺ concentration, which causes the morphology of the sample to gradually change from flower-like nanowires into rod-like nanorods, besides, the ratio of length to diameter is higher and the grain distribution is uniform. The PL characteristics show that there is strong green emission capability at about 560nm area, and with the increase of Ni²⁺ concentration, the visible emission peak is significantly enhanced. Moreover, there are weak ultraviolet laser peaks at about 380nm in the near sideband region. Finally, the photoluminescence mechanism of the samples is discussed.

Keywords:

• Nano-ZnO
• Ni-doped
• characterization
• photoluminescence

Additional information

Funding

This research was financially supported by the National Natural Science Foundation of China (61664008), the 2017 National College Training Program of Innovation and Entrepreneurship for Undergraduates (201710719008), the Natural Science Foundation of Shaanxi province (2017JM6102), the Scientific and Technological Innovation Team (2017CXTD-01), the Project of Production, Learning and Research Cooperation (2017cxy05).