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One-dimensional boron nitride nanomaterials and preparation method thereof

A technology of nanomaterials and boron nitride, which is applied in the direction of chemical instruments and methods, nanotechnology, nitrogen compounds, etc., can solve the problems of harsh conditions, dangerous conditions, only 40% output, high equipment requirements, etc., and achieve controllable appearance and high quality. Excellent, simple and controllable preparation process

Active Publication Date: 2020-03-27
上海硼矩新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have high requirements for equipment, or the conditions are relatively harsh and have certain risks, and the output is very low.
In addition, there is also a method of in-situ reaction to generate BNNR, which includes ball-milling amorphous boron powder in a dry ammonia atmosphere and then mixing with Li 2 O mixed and reacted at 1200 °C for 3 hours to obtain high-quality BNNR, but its yield was only 40%

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  • One-dimensional boron nitride nanomaterials and preparation method thereof
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  • One-dimensional boron nitride nanomaterials and preparation method thereof

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preparation example Construction

[0020] One aspect of the embodiments of the present invention provides a method for preparing a class of one-dimensional boron nitride nanomaterials, including: heating the one-dimensional borate precursor to 1000-1500°C in a nitrogen-containing atmosphere and keeping it warm for reaction, and then protecting The temperature is lowered to room temperature in the atmosphere to obtain a crude product, and then the crude product is post-treated to obtain a one-dimensional boron nitride nanomaterial.

[0021] Further, the one-dimensional borate precursor includes a one-dimensional borate material containing at least one element among lithium, beryllium, magnesium, calcium, strontium, barium, gallium, indium, zinc and titanium.

[0022] Further, the one-dimensional borate material may be selected from borate whiskers, borate nanorods, borate nanowires, borate nanoribbons, etc., and is not limited thereto.

[0023] More preferably, the preparation method includes: heating the one-di...

Embodiment 1

[0040] Example 1 takes a Mg with a diameter of about 50 nm and a length of about 10 μm 2 B 2 o 5 Whiskers 2g were filled in an open alumina crucible, then placed in a tube furnace, and vacuumed to 10 -3 Pa, 200 standard milliliters per minute (sccm) of NH 3 , heating up to 1300°C. Turn off NH after 180min at 1300°C constant temperature reaction 3 , into 200sccm N 2 , at N 2The temperature was cooled to room temperature in the atmosphere, and the crude product was obtained. Then the obtained product is washed with ultrasonic water for 5 hours, then filtered and dried to obtain boron nitride nanotubes with a purity of more than 99%. The obtained nanotubes have a diameter of about 500 nm and a length of 10 μm. In this example, 95% yield of the target product can be obtained. figure 1 The SEM image of the obtained BNNT (boron nitride nanotube) prepared for this example. figure 2 It is the TEM topography figure of the BNNT obtained in this example. image 3 and Figure...

Embodiment 2

[0041] Embodiment 2 takes Al 4 B 2 o 9 Nano-whiskers 2g were placed in an open alumina crucible, and then placed in a tube furnace. The furnace tube was purged of air by blowing 1000 standard milliliters per minute (sccm) of Ar. Then 200sccm Ar and 200sccm NH 3 The temperature was raised to 1300°C. Turn off the NH after reacting at a constant temperature of 1300°C for 4h 3 , 500 sccm of Ar was introduced to cool down to room temperature, and the crucible was taken out to obtain a crude product. Then the obtained product is ultrasonically pickled with 3 mol / L nitric acid for 1 h, filtered and dried to obtain boron nitride nanotubes with a purity of more than 99%. In this example, a 90% yield of the target product can be obtained. Figure 5 The SEM image of the BNNT obtained in this example shows that the average diameter of the BNNT nanotube is about 20 nm. Figure 6 It is the Raman image of the BNNT obtained in this embodiment.

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Abstract

The invention discloses a one-dimensional boron nitride nanometer material and a preparation method thereof. The preparation method comprises the following steps: heating a one-dimensional borate precursor to 1000 to 1500 DEG C in a nitrogen containing atmosphere, carrying out a heat-preserved reaction, carrying out cooling to a room temperature in a protective atmosphere so as to obtain a crude product, and subjecting the crude product to after-treatment so as to obtain the one-dimensional boron nitride nanometer material, wherein the one-dimensional borate precursor can be selected from thegroup consisting of borate whiskers, nanorods, nanowires, nanobelts, etc. The invention has the following advantages: the preparation process is simple and controllable; raw materials are cheap and easily available; the conversion rate of the raw materials is up to 85%; the purity of a target product after purification is up to 99%; the one-dimensional boron nitride nanometer material with a weight of a gram or above can be prepared by a single-batch reaction; batch production of the one-dimensional boron nitride nanometer material can be realized; and the one-dimensional boron nitride nanometer material is favorable for being extensively applied to a plurality fields like deep ultraviolet illumination, composite materials, heat-dissipating materials, friction materials, drug loading, catalyst carriers, etc.

Description

technical field [0001] The invention relates to a class of boron nitride nanometer materials, in particular to a class of one-dimensional boron nitride nanometer materials and a preparation method thereof, belonging to the technical field of inorganic nanometer materials. Background technique [0002] Boron nitride nanomaterials have many excellent physical and chemical properties, including excellent mechanical strength, high thermal conductivity, wide direct band gap, good chemical inertness (corrosion resistance, high temperature oxidation resistance) and large specific surface area, etc. It has broad application prospects in many fields such as electronic devices, deep ultraviolet luminescence, composite materials, heat dissipation materials, friction materials, drug loading, and catalyst loading. [0003] Among them, due to its special tubular structure, large aspect ratio and piezoelectric effect, boron nitride nanotubes (BNNT) can be used as reinforcements for composi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B82Y30/00
Inventor 姚亚刚李涛涛
Owner 上海硼矩新材料科技有限公司
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