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(a) A homemade TEM specimen holder for in situ measurements. (b) A carbon nanotube fixed on the tungsten tip. Scale bar: .
(a) curves of the field emission for different distance . (b) Corresponding F-N plots. (c) Dependence of on .
(Color) (a) Scheme of boundary condition in numeric simulation for electric field. is defined as the maximum electric field at the emitting tip. is defined as the electric field at the plane electrode opposite to the emitting tip. (b) Calculated electric field mapping for two different . (c) Calculated relationship between and .
(a) Calculated relationship between the field enhancement factor and the tube length . (b) Calculated curve of versus the tube radius .
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