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Korean Journal of Metals and Materials > Volume 59(4); 2021 > Article
Korean Journal of Metals and Materials 2021;59(4): 268-272. doi: https://doi.org/10.3365/KJMM.2021.59.4.268
Fabrication and Surface Deformation of Boron Nitride Nanotubes by RF Plasma and Ion Beam
Seong Min Hong1, Jae Geun Gil2
1High-enthalpy Plasma Research Center, Jeonbuk National University, Jeonju 54896, Republic of Korea
2NEOPion Co., Ltd. Daejeon 34025, Republic of Korea
Correspondence  Seong Min Hong ,Tel: +82-63-262-0017, Email: smhong@jbnu.ac.kr
Received: 2 November 2020;  Accepted: 20 February 2021.  Published online: 24 March 2021.
ABSTRACT
Boron Nitride Nanotubes (BNNT) are one of the candidate materials for storing hydrogen by physical adsorption. It has been reported that this hydrogen storage capacity increases as the crystallinity of the nanostructures decreases. Here, BNNT was synthesized using an RF plasma torch system, and the surface of the BNNT was irradiated with nitrogen ions using an ion beam device, and changes in the surface microstructure were subsequently investigated. A multi-walled BNNT with a wall thickness of about 5 nm was synthesized using a 60 kW RF plasma torch. Amorphous impurities generated during the synthesis process were removed by heat treatment and membrane filtering. Then nitrogen ions were irradiated for 40 minutes at energies of 40 keV and 50 keV, respectively, using an ion beam irradiation device. The changes in the microstructure of the BNNT surface following ion beam irradiation were confirmed by HR-TEM, Raman spectrometer and FT-IR spectrometer. The tube walls of the BNNT were disordered by the nitrogen ions irradiation. At 50 keV, the tube walls located in the middle became disordered, which was attributed to an increase in penetration depth due to the higher irradiation energy. The maximum peak in the Raman spectra and FT-IR spectra of the ion irradiated BNNT were also shifted to a lower frequency. Ion irradiation reduced the crystallinity of the nanostructures. The potential improvement in hydrogen storage capacity by nitrogen ion irradiation of BNNT was confirmed.
Keywords: BNNT, RF plasma torch system, nitrogen ion irradiation, hydrogen storage capacity
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