Statistical dispersion of nanocomposite emission parameters

Abstract

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.

Locally Resolved Electron Emission Area and Unified View of Field Emission from Ultrananocrystalline Diamond Films

“…Similar to the locally resolved emission properties of Si and GaN emitters, , there were a few reports demonstrating that emission from carbonic materials such as carbon nanotubes (CNT) , and synthetic nanodiamond films , could be nonuniform across the surface. Nonetheless, refs − did not attempt to quantify the actual FE area or to establish the dependence of the FE area on the applied electric field. Emphasis is given to CNT and synthetic polycrystalline diamond because these materials have long been acknowledged as the most promising FE electron sources .…”

Effects of Antimony Deposition on Field-Emission Current Density of Ge/Si

“…The density of emission current of pure Ge nanocrystal is less than the density of emission current of Ge nanocrystal with adsorption layers. Thus, the results of the study demonstrate the effectiveness of the usage of the Ge/Si nanostructures grown as multiple-point emitters [15], [16].…”

Electron Emission Area Depends on Electric Field and Unveils Field Emission Properties in Nanodiamond Films

“…Similar to the mentioned locally resolved emission properties of Si and GaN emitters [3,4], there were a few reports on non-uniform emission from carbonic materials such as carbon nanotubes (CNT) [5,6] and synthetic nanodiamond films [7]. Emphasis is given to these materials as CNT and synthetic polycrystalline diamond have long been acknowledged as promising FE electron sources [8].…”

“…Nonetheless, in Refs. [5][6][7] no attempts to quantify the actual FE area and to establish the dependence of the FE area on the applied electric field (if any) have been made. In this paper, we describe a novel approach to measure FE site distribution, laterally-resolved on the cathode surface, and to quantify it by obtaining the dependence of S on the electric field.…”