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Field Emission From The Carbon Nanotubes Grown Over Cylindrical Surface

Author(s):
D. Sarangi and A. Karimi
FSB-IPMC , EPFL
Switzerland

Carbon nanotubes are excellent field emitters due to the high aspect ratios and small radii of curvature. These properties of the nanotubes offer tremendous possibilities for the realization of field emission devices. For the realization of the field emission devices controlled placement and alignment of the nanotubes over the substrate surface is desirable. Furthermore, field emission of the nanotubes in cylindrical geometry has added advantages over planar geometry. But, it is difficult to grow nanotube uniformly over non-planar substrate like long metallic cylinder by conventional CVD technique. In the present investigation we have adopted a very simple technique called as Cold Plasma Chemical Vapor Deposition (CP-CVD) to grow carbon nanotubes over the catalyst-supported metallic wire by resistive heating in hydrocarbon atmosphere at about 750oC. The localized dissociation of the hydrocarbon gas over metallic wire allows well control growth of the nanotubes. The field emission performances of these nanotubes coated wires were carried out in a cylindrical geometry where the aluminum tube was used as anode. Emission site density is found to be the most important parameter to control the field emission performance. Comparisons of the field emission properties were made using nanotubes grown in different hydrocarbon gases like methane and acetylene. The effect of other parameter like growth time was also investigated.

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Track ID:
Paper #: A5.66
DOI: