Two-dimensional hexagonal boron nitride by cryo-milling: microstructure and oxidation behavior at elevated temperature

Boron nitride (BN) nanosheets in bulk quantity and reproducible quality were generated by a top-down approach from coarse (micron) grade hexagonal boron nitride (m-hBN) via cryo-milling under optimized process conditions followed by sonication. The as-produced boron nitride nanosheets showed a lower...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2024-05, Vol.26 (5), p.80, Article 80
Main Authors: Sarma, Sreedhara Sudhakara, Padya, Balaji, Sarada, Bulusu Venkata, Akhila, Vasamsetti, Gowthami, Chandra, Krishna, Pasam Vamsi, Joardar, Joydip
Format: Article
Language:English
Subjects:
Boron
Boron nitride
Boron oxides
Characterization and Evaluation of Materials
Chemical vapor deposition
Chemistry and Materials Science
Differential scanning calorimetry
High temperature
High temperature lubricants
Inorganic Chemistry
Lasers
Lubricants
Materials Science
Nanosheets
Nanotechnology
Optical Devices
Optics
Original Research
Oxidation
Photonics
Physical Chemistry
Sonication
Thermal stability
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Summary:Boron nitride (BN) nanosheets in bulk quantity and reproducible quality were generated by a top-down approach from coarse (micron) grade hexagonal boron nitride (m-hBN) via cryo-milling under optimized process conditions followed by sonication. The as-produced boron nitride nanosheets showed a lower average thickness of about 15–25 nm when compared to previously reported low-yield techniques like sonication and specific solvent-induced liquid exfoliation and chemical vapor deposition (CVD). Interestingly, some fraction of the hexagonal boron nitride (hBN) was transformed to rhombohedral BN (rBN) under cryo-milling conditions. Such transition assisted the generation of the layered 2D nanosheet structure due to higher interlamellar spacing of the basal planes in rBN. Thermo-gravimetric and differential scanning calorimetric (TG/DSC) studies showed thermal stability of hBN/rBN nanosheets up to about 800 °C when compared to about 1000 °C in m-hBN, with the formation of BNOx and B 2 O 3 phases. Multiple DSC peaks for oxidation were observed corresponding to different particle size ranges in the powder. Thus, cryo-milling could be an effective route for the bulk production of 2D-BN nanosheets for various applications like high-temperature lubricants. Graphical Abstract
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-024-05992-7