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

DOI: 10.1088/1361-6528/abce2e DOI Help

Authors: Zhengyu Yan (The University of Manchester) , Amor Abdelkader (Bournemouth University) , Sarah Day (Diamond Light Source) , Chiu Tang (Diamond Light Source) , Cinzia Casiraghi (The University of Manchester) , Wajira Mirihanage (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanotechnology

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 14099

Open Access Open Access

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.

Journal Keywords: hexagonal boron nitride; synchrotron X-ray diffraction; 2D material exfoliation

Subject Areas: Chemistry, Materials


Instruments: I11-High Resolution Powder Diffraction

Added On: 28/11/2020 17:20

Documents:
Yan+et+al_2020_Nanotechnology_10.1088_1361-6528_abce2e.pdf

Discipline Tags:

Inorganic Chemistry Materials Science Physics Nanoscience/Nanotechnology Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction