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Title: Enhanced field emission from cerium hexaboride coated multiwalled carbon nanotube composite films: A potential material for next generation electron sources

Intensified field emission (FE) current from temporally stable cerium hexaboride (CeB{sub 6}) coated carbon nanotubes (CNTs) on Si substrate is reported aiming to propose the new composite material as a potential candidate for future generation electron sources. The film was synthesized by a combination of chemical and physical deposition processes. A remarkable increase in maximum current density, field enhancement factor, and a reduction in turn-on field and threshold field with comparable temporal current stability are observed in CeB{sub 6}-coated CNT film when compared to pristine CeB{sub 6} film. The elemental composition and surface morphology of the films, as examined by scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray measurements, show decoration of CeB{sub 6} nanoparticles on top and walls of CNTs. Chemical functionalization of CNTs by the incorporation of CeB{sub 6} nanoparticles is evident by a remarkable increase in intensity of the 2D band in Raman spectrum of coated films as compared to pristine CeB{sub 6} films. The enhanced FE properties of the CeB{sub 6} coated CNT films are correlated to the microstructure of the films.
Authors:
;  [1] ; ; ; ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [4] ;  [6]
  1. Nanostech Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi-16 (India)
  2. Semiconductor Physics, Technische Universität Chemnitz, 09126 Chemnitz (Germany)
  3. Department of Chemistry, Indian Institute of Technology Delhi, New Delhi-16 (India)
  4. Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09126 Chemnitz (Germany)
  5. Solid Surfaces Analysis, Technische Universität Chemnitz, 09126 Chemnitz (Germany)
  6. (Germany)
Publication Date:
OSTI Identifier:
22277952
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 9; Other Information: (c) 2014 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 NANOTUBES; CERIUM; CERIUM BORIDES; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; CURRENT DENSITY; ELECTRON SOURCES; FIELD EMISSION; MICROSTRUCTURE; MORPHOLOGY; RAMAN SPECTRA; SCANNING ELECTRON MICROSCOPY; SUBSTRATES; SURFACES; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X RADIATION