期刊
APPLIED SURFACE SCIENCE
卷 567, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150727
关键词
Boron Nitride; Photoluminescence; Nanodots
类别
资金
- Italian Ministry of Foreign Affairs and International Cooperation (MAECI) [PGR05249]
- University of Sassari
- Programma Operativo Nazionale (PON) Ricerca e Innovazione 2014-2020-Linea 1
Hexagonal boron nitride (h-BN) nanodots of 10 nm have been successfully synthesized via top-down route, showing fluorescent emissions in both the UV and visible regions. Experimental results suggest that a specific combination of treatments is crucial for achieving UV emission, and quantum chemistry calculations indicate that Stones-Wales defects may be possible causes of the optical and vibrational properties.
Hexagonal boron nitride (h-BN) nanodots of 10 nm have been synthesized via top-down route from bulk powders. A combination of ultrasonic and thermal treatments in phosphoric acid has been used to achieve edge etching and size reduction to the nanoscale. A new emission in the ultraviolet region, correlated to a characteristic infrared-active vibration, has been detected in the BN dots. The UV emission is stable in as-prepared samples but quenches after thermal treatments higher than 100 degrees C. Besides the UV band, the fluorescent emission of h-BN shows a broad band in the visible region, whose intensity reaches a maximum after thermal treatment at 200 degrees C. Structural and optical characterization techniques have been used to investigate the synthesis-properties relationship in h-BN and the hydroxyl covalent functionalization of the surfaces. The experiments show that the particular combination of ultrasonic treatment and etching in temperature is essential to achieve the UV fluorescent emission. Quantum chemistry calculations have been used to evaluate Stones-Wales defects as possible causes of the optical and vibrational properties.
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