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Effect of Gas Pressure on Electron Field Emission from Carbon Nanotube Forests

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Abstract:

This article quantifies the effect of the operating pressure of the H2 + C2H4 gas mixture on the current density and threshold voltage of the electron emission from dense forests of multiwalled carbon nanotubes synthesized using thermal catalytic Chemical Vapor Deposition under near atmospheric pressure process conditions. The results suggest that in the pressure range of interest 400–700 Torr the field emission properties can be substantially improved by operating the process at lower gas pressures when the nanostructure aspect ratios are higher. The obtained threshold voltage ∼1.75 V/m and the emission current densities ∼10 mA/cm2 offer competitive advantages compared with the results reported by other authors.

Keywords: CARBON NANOTUBES; CHEMICAL VAPOR DEPOSITION (CVD); ELECTRON FIELD EMISSION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2524

Publication date: October 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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