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Title: Multiscale model of heat dissipation mechanisms during field emission from carbon nanotube fibers

A multiscale model of field emission (FE) from carbon nanotube fibers (CNFs) is developed, which takes into account Joule heating within the fiber and radiative cooling and the Nottingham effect at the tip of the individual carbon nanotubes (CNTs) in the array located at the fiber tip. The model predicts the fraction of CNTs being destroyed as a function of the applied external electric field and reproduces many experimental features observed in some recently investigated CNFs, such as order of magnitude of the emission current (mA range), low turn on electric field (fraction of V/μm), deviation from pure Fowler-Nordheim behavior at large applied electric field, hysteresis of the FE characteristics, and a spatial variation of the temperature along the CNF axis with a maximum close to its tip of a few hundred  °C.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4] ;  [3]
  1. Spintronics and Vacuum Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, Ohio 45221 (United States)
  2. Materials and Manufacturing Directorate, Air Force Research Laboratory, WPAFB, Ohio 45433 (United States)
  3. Research Institute, University of Dayton, Dayton, Ohio 45469-0170 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22492702
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON FIBERS; CARBON NANOTUBES; ELECTRIC FIELDS; ENERGY LOSSES; FIELD EMISSION; HEAT TRANSFER; JOULE HEATING; RADIATIVE COOLING; THERMAL DIFFUSIVITY