A kind of tin dioxide-zinc stannate core-shell nanowire and its preparation method

Abstract

The invention discloses a tin dioxide-zinc stannate core-shell nanowire and a preparation method thereof, comprising the following steps: Step 1: SnO 2 The powder and graphite powder are mixed at a molar ratio of 1:4 and ground evenly to obtain SnO 2 +C powder; mix ZnO powder and graphite powder at a molar ratio of 1:1, and grind them evenly to obtain ZnO+C powder; Step 2: After coating the base with gold film, place it in the deposition area and heat up to 918°C, and put the SnO 2 +C powder is placed in the high temperature zone of the vapor deposition system and heated to 980°C, and SnO is grown on the substrate by vapor deposition 2 Nanowire; step 3: place ZnO+C powder in the high temperature zone of the vapor deposition system, and grow Zn on the substrate by vapor deposition 2 SnO 4 The shell layer, the target product can be obtained after cooling down; the SnO prepared by the present invention 2 -Zn 2 SnO 4 The core-shell nanowire has obvious core-shell structure, uniform contrast, smooth interface and outer surface, excellent epitaxial relationship, simple preparation method and convenient maintenance.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a tin dioxide-zinc stannate core-shell nanowire and a preparation method. Background technique [0002] With the rapid development of global industry and the deteriorating ecological environment, the research and development of materials that use solar energy to efficiently degrade organic dyes in industrial wastewater has become a current research hotspot; research on semiconductor oxide nanomaterials as photocatalysts has received more and more attention; current materials The main idea of ​​improving the photocatalytic performance is to improve the utilization efficiency of light energy and suppress the recombination of photogenerated carriers; core-shell heterostructure materials can achieve the above requirements with one blow, because the light can be reflected and refracted multiple times in the core-shell structure, Therefore, the light-harvesting ability...

AI Technical Summary

Problems solved by technology

[0003] Both tin dioxide and zinc stannate are N-type semiconductor oxide materials that are environmentally friendly and have a wide bandgap. They all have good photocatalytic properties; among them, zinc stannate also has a higher electron mobility (10-30cm 2 vs. -1 ) and low electron-hole recombination rate, and its chemical stability is excellent; currently, Xiguang Han et al. have realized SnO 2 / Zn 2 SnO 4 The preparation of hollow structure nanomaterials, while SnO 2 -Zn 2 SnO 4 Fabrication of core-shell nanowires has never been achieved

Generally, the equipment that can change the composition of reactants during the growth process includes metal-organic chemical vapor deposition (Metal-organic Chemical Vapor Deposition, MOCVD), molecular beam epitaxy (Molecular Beam Epitaxy, MBE) and atomic layer deposition (Atomic Layer Deposition, ALD). ), but these devices are not only expensive but also complicated to operate and high in maintenance costs

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