High-Yield Synthesis of Boron Nitride Nanosheets with Strong Ultraviolet Cathodoluminescence Emission

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• 作者：Rui Gao ; Longwei Yin ; Chengxiang Wang ; Yongxin Qi ; Ning Lun ; Luyuan Zhang ; Yu-Xian Liu ; Le Kang ; Xianfen Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 27, 2009
• 年：2009
• 卷：113
• 期：34
• 页码：15160-15165
• 全文大小：363K
• 年卷期：v.113,no.34(August 27, 2009)
• ISSN：1932-7455

文摘

Bulk quantities of hexagonal boron nitride (h-BN) nanosheets have been synthesized via a simple template- and catalyst-free chemical vapor deposition process at 1100−1300 °C. Adjusting the synthesis and chemical reaction parameters, the thickness of the BN nanosheets can be tuned in a range of 25−50 nm. Fourier transform infrared spectra and electron energy loss spectra reveal the typical nature of sp²-hybridization for the BN nanosheets. It shows an onset oxidation temperature of 850 °C for BN nanosheets compared with only about 400 °C for that of carbon nanotubes under the same conditions. It reveals a strong and narrow cathodoluminescence emission in the ultraviolet range from the h-BN nanosheets, displaying strong ultraviolet lasing behavior. The fact that this luminescence response would be rather insensitive to size makes the BN nanosheets ideal candidates for lasing optical devices in the UV regime. The h-BN nanosheets are also better candidates for composite materials in high-temperature and hazardous environments.