A Platform to Optimize the Field Emission Properties of Carbon-Nanotube-Based Fibers (Postprint)
Journal Article - Open Access
Air Force Research Laboratory Wright Patterson Air Force Base United States
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Building on recent efforts 1-4 to characterize carbon nanotube fibers CNFs and electron emission 5,6 suitable for compact, high power, high frequency, vacuum electronic devices, this paper describes a proposed exhaustive approach towards optimizing CNF field emission FE properties. It outlines how a platform geared towards meaningful comparisons between different CNF-based emitters can be developed. The platform envisages an iterative procedure involving a the growth, processing, and functionalization of CNFs, b full investigation of the CNF material properties before and after FE diagnosis, and c multi-scale modeling of FE properties, including self-heating, shielding effects and beam characteristics in the CNFs and in the emitting carbon nanotubes CNTs at the fiber apexes. The modeling would be applicable to a wide variety of CNFs and wire-like sources, and would provide essential feedback to the growth, processing, and functionalization of CNFs, in order to optimize their FE properties especially long-term stability, low noise, and maximum emission current, current density and brightness.
- Refractory Fibers