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Prepn process of nanometer BN and B-C-N capsule or nanometer fullerene-like particle

A technology of nanoparticles and nanocapsules, which is applied in the new synthesis field of novel nanostructures, can solve problems such as difficulty in separation, mixed shape of BN nanostructures, and influence on the application prospects of materials, and achieve the effect of high purity

Inactive Publication Date: 2005-04-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN1397491A is the previous work of the applicant. The nanostructure of BN is relatively mixed. There are fullerene-like nanoparticles, nanotubes, and nanowires, which are difficult to separate and affect the application prospects of this type of material.

Method used

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  • Prepn process of nanometer BN and B-C-N capsule or nanometer fullerene-like particle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: with Fe 75 B 25 Nanoparticle catalysts prepared BN nanocapsules at 850 °C.

[0045] From 1mol / L KBH 4 With 0.1mol / L FeSO 4 Liquid-phase reaction produces Fe with an average particle size of about 40 nanometers 75 B 25 nanoparticles. The obtained Fe-B nanoparticles are placed in the central area of ​​the corundum tube, then repeatedly filled with argon and evacuated by a mechanical pump for 3-5 times, and the temperature is raised to 850°C at a rate of 10°C per minute under an argon atmosphere. Stop argon filling, and pass 100 SCCM of N 2 / NH 3 (4% NH 3 ) mixed gas, and reacted at 850°C for 3 hours. A crystalline BN layer is covered on the surface of Fe-B nanoparticles, and the BN nanocapsule (see image 3 ).

[0046] The N source in the present embodiment also can be in solid state, and the N source of solid state is ammonium chloride (NH 4 Cl) or urea (CO(NH 2 ) 2 ) to get the same product.

Embodiment 2

[0047] Embodiment 2: with Ni 70 B 30 Nanoparticle catalysts prepared BN nanocapsules at 900 °C.

[0048] From 1mol / L KBH 4 With 0.1mol / L NiCl 2 Liquid phase reaction produces Ni with an average particle size of about 50 nanometers 70 B 30 nanoparticles. Use this as a catalyst and place it in the center of the corundum tube, then repeatedly fill it with argon and evacuate it with a mechanical pump for 3-5 times, and raise the temperature to 900°C at a rate of 10°C per minute under an argon atmosphere. Stop argon filling, and pass 100 SCCM of N 2 / NH 3 (4%NH 3 ) mixed gas at 900°C for 2 hours. A crystalline BN layer is covered on the surface of the catalyst particle to obtain a Ni-B-wrapped BN nanocapsule with a diameter of about 40-120nm. (See Figure 4 )

Embodiment 3

[0049] Embodiment 3: with Co 75 B 25 Nanoparticle catalysts prepared BN nanocapsules at 900 °C.

[0050] From 1mol / L KBH 4 With 0.1mol / L CoCl 2 Liquid-phase reaction produces Co with an average particle size of about 30 nm 75 B 25 nanoparticles. The obtained Co-B nanoparticles are placed in the central area of ​​the corundum tube, then repeatedly filled with argon and evacuated by a mechanical pump for 3-5 times, and the temperature is raised to 900°C at a rate of 10°C per minute under an argon atmosphere. Stop argon filling, and pass 100 SCCM of N 2 / NH 3 / C 2 h 2 (4%NH 3 , 10% C 2 h 2 ) mixed gas at 900°C for 2 hours. A B-C-N layer is covered on the surface of the catalyst particles to obtain B-C-N nanocapsules with a diameter of about 30-100nm covering Ni-B. (See Figure 5 )

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Abstract

The preparation process of nanometer BN and B-C-N capsule or nanometer fullerene-like particle adopts nitrogen containing gas or solid as nitrogen source, carbon containing gas or solid as carbon source and nanometer catalyst alloy particle containing in 20-70 % or simple substance B as boron source to produce nanometer BN particle, nanometer BN capsule or the mixture of nanometer BN capsule and nanometer fullerene-like BN particle through reaction at 600-900 deg.c or under the activation of microwave plasma, and the nanometer BN capsule or the mixture of nanometer BN capsule and nanometer fullerene-like BN particle is post-treated to produce corresponding pure nanometer fullerene-like BN particle. The present invention develops one new method of preparing high purity nanometer fullerene-like particle, and several kinds of nanometer hollow BN and B-C-N structure are prepared in the said method.

Description

technical field [0001] The invention relates to a new synthesis method for preparing novel nanostructures such as BN and B-C-N fullerene nanoparticles and intermediate products such as BN and B-C-N nanocapsules. Background technique [0002] Since the discovery of C60, carbon nanostructures (including fullerenes, nanotubes, nanowires, nanospheres, nanocapsules, etc.) have aroused widespread interest and attention due to their great scientific value and potential application prospects. Both theoretical and experimental studies have shown that carbon nanostructures have a series of excellent properties, such as good chemical and thermal stability, high mechanical strength, specific electrical properties and excellent field emission characteristics. At present, people have developed a variety of technical routes to synthesize such nanostructures, such as arc discharge method, laser evaporation method and thermal chemical vapor deposition method. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C01B21/06C01B21/064C01B31/00
Inventor 胡征潘仪霍开富陆斌陈懿
Owner NANJING UNIV
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