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Kim, J.H., Pham, T.V., Hwang, J.H. et al. Nano Convergence. 2018, 5, 17.
Boron nitride nanotubes (BNNTs) have a tubular nanostructure in which boron and nitrogen atoms are arranged in a hexagonal network. Due to their unique atomic structure, BNNTs have many excellent intrinsic properties, such as excellent mechanical strength, high thermal conductivity, electrical insulation behavior, piezoelectric properties, neutron shielding ability, and oxidation resistance.
BNNT Synthesis Methods
a. Arc discharge method: Chopra et al. first experimentally discovered BNNT in arc discharge in 1995.
Ball milling method: Ball milling is a promising technique for synthesizing BNNT on an industrial scale at low cost.
b. Chemical vapor deposition (CVD) method: Chemical vapor deposition (CVD) is one of the most commonly used methods for preparing carbon nanomaterials and is used to synthesize boron nitride materials.
c. Laser ablation method: Boron nitride nanotubes prepared by laser ablation have the advantages of low wall number, high aspect ratio and high crystallinity.
d. Thermal plasma jet method: Although the boron nitride produced by laser ablation technology has high structural quality, the production speed is still limited. The thermal plasma method is able to apply high thermal energy over a wider volume, extending the growth area of BNNT to hundreds of square centimeters.
BNNT Applications
The effectiveness of BNNTs in reinforcing polymer composites, improving thermal management capabilities of electronic devices, and enhancing neutron shielding in aerospace has been widely recognized.
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