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(a) FEIG tungsten nanowire at different growth periods. Accumulated growth time and nanowire length are indicated in each micrograph. A line matching the length of each nanowire is drawn to provide a visual aid to indicate the length. Anode-cathode gap is . (b) Corresponding voltage profile at constant current during nanowire growth and detailed plot of the voltage profile after nanowire initiation.
TEM images of FEIG nanowire taken by a JEOL 2010F TEM at .
Turn-on voltage for emission current obtained from a closed-loop voltage sweep for the first eight growth periods as a function of nanowire length. Error in the estimation of nanowire length from SEM micrograph is indicated. obtained from simulation is shown for comparison.
Experimental and simulated profiles during nanowire growth. -error bars indicate error in estimating nanowire length from SEM micrograph. from Eq. (4) is shown for comparison.
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