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In-situ probing of the thermal treatment of h-BN towards exfoliation.

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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DOI: 10.1088/1361-6528/abce2e


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
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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