Effect Of Surface Modification On ZnO Nanorods Microstructure, Magnetic And Optical Properties

ZnO nanorods material has great potential in the field of nanotechnology. Due to excellent performance and huge market demand in terms of luminescent materials, magnetic semiconduntor materials, catalysts, sensors and other fields, research on the ZnO nanorods materials is very active. The luminescent and magnetic properties of ZnO nanorods have a close relationship with its surface structure. Surface modification of ZnO nanorods can not only effectively adjust its surface structure and improve its performance, but also help us to understand the physical mechanisms. In this paper, we use a thin layer of MoS₂ and MoO_x to modificate the surface of ZnO nanorods, and studied the microstructure, photoluminescence and magnetic properties of ZnO nanorods by surface modification. This paper mainly involves the following aspects:（1） Using hydrothermal synthesis method and chemical vapor deposition method, we can prepare the Zn O nanorods and the layered structure of molybdenum disulfide.（2） This paper attempts to explore surface modification method of ZnO nanorods to learn the microstructure, magnetic and photoluminescence properties, and prepare the core-shell ZnO-MoS₂ material to analyze the variation. TEM and Raman spectroscopy confirmed the presence of a small layer of MoS₂. The gap between Raman peaks can be used to determine the thickness of MoS₂ in the ZnO-MoS₂ materials. The layer thickness is 0.63 nm and the number of layers is three.（3） UV peak intensity of ZnO nanorods is weakened. The reason may be related to the damage on the surface of ZnO nanorods by modification, the photo-generated carriers separate and UV absorption of MoS₂. Visible light emission peak intensity of ZnO nanorods decreased slightly, the influences of oxygen vacancies and oxygen defects in ZnO nanorods by MoS₂ modification are small.After modification of thin layer of MoS₂, there is a new peak of visible light in the ZnO nanorods sample, which may come from the interface between ZnO and MoS₂. After modification of thin layer of MoS₂, the magnetic of pure ZnO nanorods sample has no significant changes by MoS₂, indicating the magnetic in the thin layer MoS₂ material is weak.（4） Compared with MoS₂ powder, after modification of thin layer of MoS₂, the 2ZnO-MoS have a good sensitivity to RDX explosives and can be used to detect the content of RDX explosives. It’s expected to be applied to reality.（5） Compared with the modification of thin layer of MoS₂, X-ray photoelectron spectroscopy of Zn in ZnO nanorods move to the low binding energy by 0.3eV after the surface modification of MoO_x. The surface morphology of ZnO nanorods changed greatly, from hexagonal prism shape to lotus shape. After modification of MoO_x, the UV emission peak intensity of ZnO nanorods decreases, which located at 378nm.