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A method for studying fluctuations in the microscopic emission parameters of flat multiple-point cathodes has been developed. For field emitters based on polymer/multiwalled carbon nanotube nanocomposites, the statistical distribution of the effective heights of emission centers has been obtained. Numerical estimates made using Pearson's chi-squared test confirmed that this distribution is lognormal. For these field emitters, the influence of the emission current on the statistical parameters that describe the emission characteristics is discussed.

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Articles you may be interested inFlexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission J. Vac. Sci. Technol. B 28, C2C5 (2010); 10.1116/1.3363855 Temperature evaluation of field emitting points for polymer-carbon nanotube composite using time-of-flight mass spectrometry J. Multi-walled nanotube polymer composite degradation under high emission current regime as revealed by mass spectrometry J. Vac. Sci. Technol. B 26, 745 (2008); 10.1116/1.2894895 Field electron emission from free-standing flexible PDMS-supported carbon-nanotube-array filmsThis work describes the investigation of carbon nanotube-polymeric nanocomposites and other multiple-tip emitters based on a new reflectron-type time-of-flight mass spectrometer specialized for field emission (FE) tasks, as well as a multichannel acquisition system and on-line processing of the current-voltage characteristics and other parameters of flat multipoint field emitters. Evidence concerning the transfer of large molecular clusters of the emitter material to the opposite electrode for as-prepared samples is presented. It is determined that a vacuum discharge phenomenon in the interelectrode gap is accompanied by strong emission of acetylene. It is also shown that the main volatile product in the FE experiment is hydrogen. The CO and CO 2 ratio during the FE experiment is not constant, and hence, arises from different processes. These oxygen-containing volatile products in the spectrum are observed for as-prepared samples at the vacuum discharge, and also arise after long-term heating of the anode surface by an electron current.