Preparation method of doped vanadium dioxide nano-powder

Abstract

The invention discloses a preparation method of doped vanadium dioxide nano-powder. The method comprises the following steps that according to the preparation quantity of the product V1-xMxO2 (whereinM is one or two of doping elements of W and Mo, and x is greater than and equal to 0 and is smaller than and equal to 0.25) and the molar ratios of the doping elements to vanadium in the chemical formula of the product, a W / Mo-source reactant and ammonium metavanadate with the corresponding mass are weighed, according to 0.5-6 times of the mole number of the metal elements in the product, solid organic acid and ammonium salt of the solid organic acid are weighed and added into a ball-milling tank of a ball-milling machine for ball-milling for 0.5-5 hours, a ball-milling product is dried in the air at 60-120 DEG C for 0.5-8 hours, calcined at the atmosphere of specific gas at 200-800 DEG C for 0.5-6 hours and cooled to room temperature, and then the final product is obtained. The preparedpowder is even in particle and pure in phase, moreover, equipment is simple, the raw materials are easy to get, the yield is high, time is short, the cost is low, large-scale preparation is easy, andthus the method has very good industrial application prospects.

Description

technical field [0001] The invention belongs to the field of nano-powder preparation, and relates to a green, efficient and quick method for preparing monoclinic phase-doped vanadium dioxide nano-powder. technical background [0002] The study found that monoclinic vanadium dioxide is an inorganic thermal phase change material. When the temperature reaches 68 °C, vanadium dioxide will transform from a low-temperature monoclinic phase to a high-temperature rutile phase, showing a metal-semiconductor transition, accompanied by Changes in physical properties such as optics, magnetism, and electricity, and by doping vanadium dioxide with elements, can greatly reduce the phase transition temperature. Materials and other aspects show a wide range of application prospects. [0003] At present, there are many methods for preparing monoclinic nano vanadium dioxide, such as hydrothermal method, sol-gel method, precipitation pyrolysis method and so on. Gao Yanfeng et al. used vanadiu...

AI Technical Summary

Problems solved by technology

Although the pyrolysis method can easily obtain a single precursor and smaller vanadium dioxide particles, it can be seen from the raw materials that the selected vanadium pentoxide and hydrazine hydrochloride are highly toxic substances, which are not conducive to environmental protection and industrialization Production

In short, the current preparation of doped nano-vanadium dioxide has technical bottlenecks such as long cycle, low yield, high energy consumption, high toxicity of raw materials, and large amount of waste water. new method of synthesis

Images