Abstract
Boron nitride nanosheets (BNNSs) have an identical crystal structure and similar lattice parameter to those of graphene sheets. However, growing quality BNNSs consisting of only several atomic layers remains a challenge. Here, we report on the synthesis of BNNSs at a temperature of 350 °C using a CO2 pulsed laser plasma deposition (CO2-PLD) technique by irradiating a pyrolytic hexagonal boron nitride (h-BN) target. The deposition was performed either in vacuum at a pressure of 0.2 Pa, for which we obtained polycrystalline BN, or in hydrogen (H2) atmosphere at a pressure of 26 Pa for which we obtained single-crystal BNNSs. The presence of H2 seems to minimize the side effects of sputtering and the material shows higher purity and better crystallinity. High resolution transmission electron microscopy (HRTEM) showed the sheets to be mostly defect-free and to have the characteristic honeycomb structure of six-membered B3-N3 hexagon. HRTEM, electron diffraction, X-ray diffraction, Raman scattering, and Fourier transform infrared spectroscopy clearly identified h-BN.
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Acknowledgements
The electron microscopy was performed at the Nanoscopy Facility, a user facility at the University of Puerto Rico (UPR), sponsored UPR, NSF, and NASA.
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Sajjad, M., Ahmadi, M., Guinel, M.JF. et al. Large scale synthesis of single-crystal and polycrystalline boron nitride nanosheets. J Mater Sci 48, 2543–2549 (2013). https://doi.org/10.1007/s10853-012-7044-4
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DOI: https://doi.org/10.1007/s10853-012-7044-4