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 mu m(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. (C) 2008 Elsevier Ltd. All rights reserved.

Local probing of the field emission stability of vertically aligned multi-walled carbon nanotubes

PASSACANTANDO, MAURIZIO;SANTUCCI, Sandro;
2009-01-01

Abstract

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 mu m(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. (C) 2008 Elsevier Ltd. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/3241
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