期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 10, 期 8, 页码 5051-5055出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2010.2432
关键词
Graphene; Field Emission; Vacuum Microelectronic
类别
资金
- NSFC [60071043, 60532010]
- Ministry of Education of China [200806140007]
- Defense Threat Reduction Agency [HDTRA1-07-1-0015]
Graphene nanosheets have been synthesized from commercial expandable graphite by heating in a microwave oven and dispersing in ethanol by ultrasonication. Scanning and transmission electron microscopy and electron energy-loss spectroscopy and atomic force microscope showed that the nanosheets were about 2 nm in thickness and 10 mu m in diameter. The field emission of the graphene sheets has been investigated. An emission current density of 1 mA/cm(2) has been achieved at an electric field of 3.7 V/mu m with a turn-on field of 1.7 V/mu m at 0.01 mA/cm(2). The annealing of the samples at 400 degrees C in vacuum greatly improved the field emission performance.
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