Physics – Condensed Matter – Materials Science
Scientific paper
2008-02-29
CARBON Volume: 47 Issue: 4 Pages: 1074-1080 Published: APR 2009
Physics
Condensed Matter
Materials Science
15 pages, 7 figures
Scientific paper
10.1016/j.carbon.2008.12.035
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 50nm) allowed to measure current contribution from sample areas smaller than 1um^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 hours) at current intensities between 10-5A and 10-8A. Improvement of the current stability has been observed after performing long-time Joule heating conditioning to completely remove possible adsorbates on the nanotubes.
Bartolomeo Antonio Di
Bobba Fabrizio
Cucolo Anna Maria
Giubileo Filippo
Iemmo L.
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