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Preparation methods of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes

A hexaboride and nanowire technology, applied in the chemical field, can solve problems such as poor morphology, increased production costs, and low output, and achieve the effects of high yield, easy operation, and low corrosion

Inactive Publication Date: 2017-08-25
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In (1) method, since BCl 3 Corrosion is very strong, so there are shortcomings such as low yield and poor appearance in the synthetic sample; in the (2) kind of method, because it is B 10 h 14 Be a kind of solid, and need transport at high temperature, use Pt, Au catalyst also can increase production cost in addition; In (3) kind of method, because B 2 h 6 It is highly toxic and should not be used as boron source precursor

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  • Preparation methods of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes
  • Preparation methods of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes
  • Preparation methods of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes

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Embodiment 1

[0020] Embodiment 1 of the present invention: a preparation method of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes, comprising the following steps:

[0021] 1) Weigh 0.1g of LaCl 3 and 1.0g of NaBH 4 Put them into different containers respectively, and place the containers containing the metal source and the boron source in the middle of the quartz tube of the tube electric furnace;

[0022] 2) Put the pure substrate on the ceramic boat, and put the ceramic boat into the downflow direction of the quartz tube precursor of the tube electric furnace; seal the quartz tube, and fill it with protective gas, the protective gas is argon, and then tube vacuum;

[0023] 3) Under vacuum conditions, heat the quartz tube to 1050°C at a heating rate of 50°C / min, with a protective gas flow rate of 100 sccm; keep warm for 60 minutes;

[0024] 4) Finally, cool naturally to room temperature in a vacuum atmosphere; take out the substrate and observe directly, the...

Embodiment 2

[0025] Embodiment 2 of the present invention: a preparation method of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes, comprising the following steps:

[0026] 1) Weigh 0.2g of LaCl 3 and 1.6g of KBH 4 Put them into different containers respectively, and place the containers containing the metal source and the boron source in the middle of the quartz tube of the tube electric furnace;

[0027] 2) Put the pure substrate on the ceramic boat, and put the ceramic boat into the downflow direction of the quartz tube precursor of the tube electric furnace; seal the quartz tube, and fill it with protective gas, the protective gas is argon, and then tube vacuum;

[0028] 3) Under vacuum conditions, heat the quartz tube to 1070°C at a heating rate of 60°C / min, and the protective gas flow rate is 100 sccm; keep warm for 15 minutes;

[0029] 4) Finally, cool naturally in a vacuum atmosphere until it cools down to room temperature; take out the substrate and o...

Embodiment 3

[0030] Embodiment 3 of the present invention: a preparation method of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes, comprising the following steps:

[0031] 1) Weigh 0.1g of CeCl 3 , 0.1g of CaCl 2 , 1.6 g NaBH 4 and KBH 4 Put them into different containers respectively, and place the containers containing the metal source and the boron source in the middle of the quartz tube of the tube electric furnace;

[0032] 2) Put the pure substrate on the ceramic boat, and put the ceramic boat into the downflow direction of the quartz tube precursor of the tube electric furnace; seal the quartz tube, and fill it with protective gas, the protective gas is argon, and then tube vacuum;

[0033] 3) Under vacuum conditions, heat the quartz tube to 1070°C at a heating rate of 30°C / min, and the protective gas flow rate is 60 sccm; keep warm for 20 minutes;

[0034] 4) Finally, cool naturally in a vacuum atmosphere until it cools down to room temperature; tak...

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Abstract

The invention relates to a preparation method of rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes. Traditional methods for preparing hexaboride nanowires have disadvantages such as high cost, high toxicity, and strong corrosion. The invention discloses a new reaction process on a substrate, using one of rare earth metal chlorides or alkaline earth metal chlorides or a combination thereof as a metal source, and borohydride as a boron source, at 900-1050°C Synthesis of hexaboride nanowires, nanorods and nanotubes under favorable conditions. The method does not need reducing gas and catalyst, and has the advantages of simple process conditions, good crystallinity, high yield and the like.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a method for preparing rare earth and alkaline earth hexaboride nanowires, nanorods and nanotubes. Background technique [0002] Rare earth and alkaline earth hexaborides have a special structure that makes them have unique properties in magnetism, light, electricity, etc., especially a series of excellent properties unmatched by other materials, such as low work function, high melting point, low evaporation rate, It has the characteristics of high hardness, high conductivity, and strong chemical stability. It is because of the good physical and chemical properties of this material that the field emission electron source or device prepared by it has stable performance and long service life. Important reason for application prospects. This series of materials are widely used in various civil and national defense industries such as cold cathode emission sources, sensors, microelectronic d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04B82Y30/00
Inventor 肖立华唐东升
Owner GUIZHOU INST OF TECH
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