期刊
NANOTECHNOLOGY
卷 27, 期 44, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/44/445707
关键词
field emission; carbon quantum dots; photoluminescence; nitrogen-doping
资金
- National Natural Science Foundation of China [51002161]
In this paper, a facile synthesis of carbon quantum dots (CQDs) and its field emission performance are reported. The CQDs are prepared from a single N, N-dimethylformamide acting as carbon and nitrogen-doping sources simultaneously. The CQDs are investigated by photoluminescence, transmission electron microscopy and x-ray photoelectron spectroscopy. The CQDs have an average size of 3 nm and are doped with N atoms. CQD dispersion shows strong fluorescence under UV illumination. For the first time, the field emission behavior of CQDs coated on Si substrate is studied. As a candidate of cold cathode, the CQDs display good field emission performance. The CQD emitter reaches the current density of 1.1 mA cm(-2) at 7.0 V mu m(-1) and exhibits good long-term emission stability, suggesting promising application in field emission devices.
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