Method for preparing quasi-one-dimensional rare earth hexaboride nanowire

Abstract

The invention discloses a method for preparing a quasi-one-dimensional rare earth hexaboride nanowire. The method comprises the following steps: (1) placing a boron source in a temperature zone 1 in an upper air flow direction of a tubular electric furnace, placing a rare earth source in a temperature zone 2 in a lower air flow direction, placing a silicon substrate in a lower air flow direction of the rare earth source in the temperature zone 2, and scrubbing repeatedly; (2) introducing a protective atmosphere, directly raising the temperatures of the temperature zone 1 and the temperature zone 2 to 850-1100 DEG C at velocities of 20-30 DEG C / minute and 10-20 DEG C / minute, after the temperature is stabilized, keeping the temperature for 20-180 minutes, and naturally cooling, thereby obtaining the quasi-one-dimensional rare earth hexaboride nanowire. The quasi-one-dimensional rare earth hexaboride nanowire prepared by using the method disclosed by the invention is high in yield, the diameter of a nano structure is about 30-150nm, and the length is about 1-5mu m; by adopting the method disclosed by the invention, large-scale direct controllable growth of the quasi-one-dimensional rare earth hexaboride nanowire which is uniform in morphology is achieved, and the method is simple in process, low in cost and convenient in industrial production.

Description

technical field [0001] The invention relates to a method for preparing rare earth hexaboride nanowires, in particular to a method for preparing quasi-one-dimensional rare earth hexaboride nanowires by catalytic chemical vapor deposition. Background technique [0002] Rare earth hexaboride has a special structure, which makes it have unique properties in magnetism, optics, electricity, etc., especially a series of excellent characteristics that other materials cannot match, such as small work function, high melting point, high hardness, electrical conductivity High, good chemical stability and thermal stability. It is because of the good physical and chemical properties of this material that the field emission cathode material and its array material prepared with it have stable performance, long service life, and very broad application prospects. This series of materials can be widely used in various civil and national defense industries such as field emission flat panel dis...

AI Technical Summary

Problems solved by technology

However, for method (1), there is a BCl 3 Strong corrosion, low output, poor shape controllability and other disadvantages; (2) method, due to the solid boron source B 10 h 14 It needs to be transported at high temperature, and the use of noble metals such as Pt and Au as catalysts will increase production costs; method (3), B 2 h 6 It is highly toxic and should not be used as a boron source precursor

[0004] CN105271281A discloses a preparation method of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes, which uses a single temperature zone for synchronous temperature rise synthesis, and the prepared nanowires, nanotubes and nanorods have a large lateral distribution scale, Morphology is difficult to control, and the yield is low, there are a lot of nanoparticles

[0005] In the technical scheme disclosed in 201510878324.X, the floating catalyst method used to prepare the lanthanum hexaboride nanostructure array material must adopt two-step heating and heat preservation control, the preparation process is relatively complicated, and the preparation temperature is relatively high

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