Field emission from few-layer graphene nanosheets produced by liquid phase exfoliation of graphite.
نویسندگان
چکیده
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 microm in diameter. The field emission of the graphene sheets has been investigated. An emission current density of 1 mA/cm2 has been achieved at an electric field of 3.7 V/microm with a turn-on field of 1.7 V/microm at 0.01 mA/cm2. The annealing of the samples at 400 degrees C in vacuum greatly improved the field emission performance.
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عنوان ژورنال:
- Journal of nanoscience and nanotechnology
دوره 10 8 شماره
صفحات -
تاریخ انتشار 2010