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Properties of the Micro / Nano Structure of Boron Nitride

Regarding the low-cost and large-scale synthesis methods of a variety of micro-nano-structured boron nitride materials, micro-nanobor nitride materials with different structures and functions have been obtained for different fields, and the mechanics. These materials were systematically discussed Properties, electricity, optics, etc. lay the theoretical and experimental foundations for its application in the fields of nanoelectronics, composite hardening, and energy.

(1) Pilot development of green equipment for large-scale synthesis and marketing of spherical boron nitride nanoparticles

Using trimethyl borate as a raw material, spherical BN nanoparticles are prepared by the CVD method and precise control of the synthesis process, which performs large-scale synthesis of boron nitride nanospheres with a diameter of 30-50 nm. This CVD method is not only simple in the process, and the by-products are organic alcohols and ethers that can be collected, which does not pollute the environment. Currently, the center has conducted pilot production of spherical boron nitride nanoparticles, which can produce more than 5 kg of boron nitride nanospheres per day, laying the groundwork for industrial applications. The industrial promotion of related products has reached a preliminary agreement with the company. Using this spherical boron nitride as a precursor, nano twin cubic boron nitride is prepared by high temperature and high pressure reaction without the addition of catalyst. The hardness of this material is much more than commercial commercial micron grade cubic boron nitride, more than the ideal hardness of the diamond, but also shows excellent fracture toughness and high temperature oxidation resistance, this research work will open, undoubtedly broad prospects for future applications in tools and exercises.

(2) Controllable synthesis and performance research of boron nitride nanotubes

He invented the "in situ CVD reaction method with detachable catalyst", which carried out the large-scale and low-cost preparation of boron nitride nanotubes. Laboratory growth equipment established in accordance with this method can produce 10 g of BN nanotubes with a purity of more than 95% per day. At the same time, for the first time in the world, a boron nitride nanotube with a complete defect structure (now known as the collapsed boron nitride nanotube) was obtained. In recent years, we have also synthesized ultrafine boron nitride nanotubes with a diameter of less than 10 nm using Li2O as a catalyst; boron nitride microtubes synthesized with a tube wall thickness of approximately 50 nm using Li2CO3 as catalyst, and introduced a carbon source into the raw material C-doped boron nitride microtubes were synthesized, and the field emission performance of the NCB tube doped was much improved compared to the pure boron nitride microtube.

In-depth study of electronic transport, hydrogen storage, thermal conduction, field emissions, optical and mechanical properties of the micro / nano structure of boron nitride. The chemical vapor deposition method was used to synthesize F-doped boron nitride nanotubes for the first time. The conductivity of this F-doped boron nitride nanotube can be adjusted with the amount of doping. Increasing the conductivity of BN nanotubes by more than 3 orders of magnitude. We also found that collapsed boron nitride nanotubes with a completely defective structure have a hydrogen adsorption value of 4.2 wt% at 10 MPa and room temperature. There are also systematic studies on mechanics, thermal, field emissions, photocatalysis, functionalization and composites of boron nitride nanomaterials.

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