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

机译：原位探测H-BN朝向去角质的热处理

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摘要

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, 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.
机译：二维（2D）六方氮化硼（h-BN）在更广泛的工程应用中变得越来越有趣。热剥离技术被认为是一种生产大量2D h-BN的简便技术。进一步优化工艺需要对剥落机理有基本的了解，而这一点很难通过非原位技术实现。在本研究中，在将大块h-BN加热至1273 K时进行了原位同步辐射x射线粉末衍射实验。在加热过程中，观察到c轴的线性膨胀，而a轴的收缩高达750 K左右，与之前的研究一致。然而，当加热超过750 K时，新观察到在a轴方向上从收缩到膨胀的变化行为。考虑到之前的热氧化研究，提出了高温下氧间隙和氮替代的热辅助剥落假设。

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