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The effect of an in situ Cs treatment on the field emission of a multi-walled carbon nanotube (MWNT) was investigated. The field emission of as-grown MWNT shows two Fowler-Nordheim (F-N) slopes in current-voltage characteristics. Both slopes in the two regions (high voltage and low voltage) were lowered as the result of the Cs treatment. The turn-on voltage was significantly decreased by a factor...
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