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Title: Outstanding field emission properties of wet-processed titanium dioxide coated carbon nanotube based field emission devices

Field emission devices using a wet-processed composite cathode of carbon nanotube films coated with titanium dioxide exhibit outstanding field emission characteristics, including ultralow turn on field of 0.383 V μm{sup −1} and threshold field of 0.657 V μm{sup −1} corresponding with a very high field enhancement factor of 20 000, exceptional current stability, and excellent emission uniformity. The improved field emission properties are attributed to the enhanced edge effect simultaneously with the reduced screening effect, and the lowered work function of the composite cathode. In addition, the highly stable electron emission is found due to the presence of titanium dioxide nanoparticles on the carbon nanotubes, which prohibits the cathode from the influence of ions and free radical created in the emission process as well as residual oxygen gas in the device. The high-performance solution-processed composite cathode demonstrates great potential application in vacuum electronic devices.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [3]
  1. Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, Department of Physics, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062 (China)
  2. Department of Physics, Zhejiang University, 38 ZheDa Road, Hangzhou 310027 (China)
  3. Department of Electronic Science and Technology, Tongji University, 4800 Caoan Road, Shanghai 201804 (China)
Publication Date:
OSTI Identifier:
22412665
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON NANOTUBES; COMPOSITE MATERIALS; ELECTRON EMISSION; FIELD EMISSION; FILMS; NANOPARTICLES; OXYGEN; PHASE STABILITY; POTENTIALS; TITANIUM OXIDES; WORK FUNCTIONS