Publications (4)2.71 Total impact
Conference Paper: A Study of field electron emission from carbon nanoclusters[Show abstract] [Hide abstract]
ABSTRACT: The present work is devoted to the investigation of the characteristics of field emission from carbon nanoclusters (nanotubes, nanodiamonds and their composites) produced by cold destruction from natural graphite. Field emission microscopy and scanning electron microscopy were used to study the structure of the emitting surface. It was shown from the field emission image that this structure has high density of emission centers of approximately equal efficiency. Also, the field emission current varies with electric field, observed from current-voltage characteristics, in accordance with the Fowler-Nordheim law. Investigations of the emission properties of carbon nanoclusters confirmed that field emission from these materials takes place in electric fields more than two orders of magnitude lower than in metals and semiconductors. The current-voltage characteristics investigated in a wide range of currents (4 orders of magnitude) give a positive evidence that the mechanism of electron emission from these materials is linked to tunneling emission. No clear interpretation exists at the moment of the extremely low threshold field for the electron emission from carbon nanoclusters.
Conference Paper: A study of field emission from supramolecular carbon structures[Show abstract] [Hide abstract]
ABSTRACT: The characteristics of field emission from carbon nanoclusters (mainly nanotubes with open ends) produced by cold destruction from natural graphite are investigated. The specimen employed in the study is a coating of carbon nanocluster mixture in N-methylpirolidone upon a tungsten electrode. Field emission microscopy, electron microscopy, electron diffraction and IR spectroscopy are employed in structure studies of the carbon specimen. Investigation of the emission properties of the specimens confirmed that field emission from these materials takes place in electric fields more than two orders of magnitude lower than in metals and semiconductors. The mechanism of electron emission from these materials is evidently linked to tunneling emission.
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ABSTRACT: The present work is devoted to investigation of field emission features of carbon nanotubes produced directly on the arc cathode during arc discharge vaporization of graphite under conditions favorable for fullerene synthesis. Field emission microscopy and scanning electron microscopy were both employed in studies of the structure of the emitting surface. Field emission characteristics measured over an emission current range of four to five orders of magnitude closely follow linear dependencies in the Fowler–Nordheim coordinates. Direct observations of the emitting surface in a field emission microscope have revealed high density and uniformity of emission centers and very low operating voltages. Based on the electron microscopic data, it was shown that the anomalously low threshold for field emission cannot be explained from the geometrical factor.
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ABSTRACT: Carbon clusters, for example nanotubes, are interesting as field emitters because of it have small radius of curvature and sufficient height. Therefore factor of field amplification can allows getting the field emission from these formations at small voltage. Fullerenes, carbon clusters and particularly nanotubes are self-organizing structures, which basically permit on a completely new basis to create the field emission arrays. It was shown also that fullerene structures and nanotubes carbon cluster films have an electronic work function that is substantially lower that for graphite. These properties of the fullerene structure and nanotubes are of interest both for fundamental research into the emission mechanism and surface properties and for applied research into their possible utilization as efficient field emission cathodes in vacuum microelectronics
St. Petersburg State University of TelecommunicationSankt-Peterburg, St.-Petersburg, Russia