Yan, Z., Abdelkader, A.M., Day, S., Tang, C., Casiraghi, C. and Mirihanage, W., 2021. In-situ probing of the thermal treatment of h-BN towards exfoliation. Nanotechnology, 32 (10), 105704.
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Abstract
Two-dimensional (2D) hexagonal boron nitride (h-BN) is becoming increasingly interesting for wider engineering applications. Thermal exfoliation is being suggested as a facile technology to produce large quantities of 2D h-BN. Further optimization of the process requires fundamental understanding of the exfoliation mechanism, which is hardly realized by ex-situ techniques. In this study, time resolved in-situ synchrotron X-ray powder diffraction experiments are conducted while heat treating bulk h-BN up to 1273 K. During the heating process, linear expansion of c-axis is observed and the contraction of a-axis up to around 750 K is consistent with previous research. However, a changing behavior from contraction to expansion in a- axis direction is newly observed when heating over 750 K. With the consideration of previous thermally oxidation studies, a hypothesis of thermal assisted exfoliation with oxygen interstitial and substitution of nitrogen at high temperature is proposed.
Item Type: | Article |
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ISSN: | 0957-4484 |
Uncontrolled Keywords: | 2D material exfoliation ; X-ray diffraction ; hexagonal boron nitride |
Group: | Faculty of Science & Technology |
ID Code: | 34922 |
Deposited By: | Symplectic RT2 |
Deposited On: | 01 Dec 2020 10:32 |
Last Modified: | 14 Mar 2022 14:25 |
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