Abstract
Boron nitride nanosheets (BNNS) were recently synthesized in a powder form using inductively coupled plasma through two readily-scalable bottom-up routes: (i) heterogeneous nucleation using amorphous boron particles and nitrogen, (ii) homogeneous nucleation from ammonia borane and nitrogen. The operating pressure was found to play a significant role in controlling the product purity and sheet dimensions in both routes. This work attempts to understand the effect of pressure by first presenting thermodynamic equilibrium calculations for the two systems at various pressures. From these, we estimate nucleation zones for BNNS and identify their possible major precursors. Computational fluid dynamics simulations (CFD) are then used to calculate plasma thermofluidic profiles by which axial residence times and gas cooling rates are estimated for the nucleation zones. Finally, in-situ optical emission spectroscopy (OES) is used to investigate the chemical composition of the gas during BNNS synthesis. It is found that the optimum pressure for the two routes is 62 kPa. The formation of BNNS heterogeneously follows a base-growth mechanism and requires the presence of liquid boron, B(liq) and N2/N/BN(g). The nucleation theory is used to explain the formation of BNNS homogeneously from BxNyHz critical clusters that grow into BNNS by the addition of BH/BN/NH onto the clusters. Thermodynamic equilibrium charts predict the formation of these species in their corresponding systems. Based on the species densities, BNNS formation/nucleation temperature ranges are proposed, e.g., around 2740–2350 K at the optimum pressure. The CFD simulation results at the formation/nucleation zones show that residence times and cooling rates control the formation of BNNS. These are found to be 12.4 ms and 34.1 × 103 K s−1, respectively, at the optimum operating pressure. OES spectra of both routes show the presence of several species consistent with the thermodynamic equilibrium results.
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This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). We, the authors, acknowledge with deep appreciation the contribution of our former colleague and lab member Dr. Norma-Yadira Mendoza-Gonzalez for her meticulous training and the continuous support on Ansys-FLUENT through which the results on CFD modeling were acquired.
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Alrebh, A., Meunier, JL. Boron Nitride Nanosheets Synthesis in Thermal Plasma: An Experimental and Modelling Analysis. Plasma Chem Plasma Process 42, 855–884 (2022). https://doi.org/10.1007/s11090-022-10245-3
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DOI: https://doi.org/10.1007/s11090-022-10245-3