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Local probing of the field emission stability of vertically aligned multi-walled carbon nanotubes
Metallic cantilever in high vacuum atomic force microscope has been used as anode for field emission experiments from densely packed vertically aligned multi-walled carbon nanotubes. The high spatial resolution provided by the scanning probe technique allowed precise setting of the tip-sample distan...
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Published in: | Carbon (New York) 2009-04, Vol.47 (4), p.1074-1080 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Metallic cantilever in high vacuum atomic force microscope has been used as anode for field emission experiments from densely packed vertically aligned multi-walled carbon nanotubes. The high spatial resolution provided by the scanning probe technique allowed precise setting of the tip-sample distance in the submicron region. The dimension of the probe (curvature radius below 50
nm) allowed to measure current contribution from sample areas smaller than 1
μm
2. The study of long-term stability evidenced that on these small areas the field emission current remains stable (within 10% fluctuations) several hours (at least up to 72
h) at current intensities between 10
−5 and 10
−8
A. Improvement of the current stability has been observed after performing long-time conditioning process to remove possible adsorbates on the nanotubes. |
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ISSN: | 0008-6223 1873-3891 |
DOI: | 10.1016/j.carbon.2008.12.035 |