Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes

Correlation with physical properties

Rajkumar Patra, S. Ghosh, E. Sheremet, Menaka Jha, R. D. Rodriguez, D. Lehmann, A. K. Ganguli, H. Schmidt, S. Schulze, M. Hietschold, D. R.T. Zahn, O. G. Schmidt

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Detailed results from field emission studies of lanthanum hexaboride (LaB6) coated multiwalled carbon nanotube (MWCNT) films, pristine LaB6 films, and pristine MWCNT films are reported. The films have been synthesized by a combination of chemical and physical deposition processes. An impressive increase in field enhancement factor and temporal stability as well as a reduction in turn-on field and threshold field are observed in LaB6-coated MWCNTs compared to pristine MWCNT and pristine LaB6 films. Surface morphology of the films has been examined by scanning electron microscopy. Introduction of LaB6 nanoparticles on the outer walls of CNTs LaB6-coated MWCNTs films is confirmed by transmission electron microscopy. The presence of LaB6 was confirmed by X-ray photoelectron spectroscopy results and further validated by the Raman spectra. Raman spectroscopy also shows 67% increase in defect concentration in MWCNTs upon coating with LaB6 and an upshift in the 2D band that could be attributed to p-type doping. Ultraviolet photoelectron spectroscopy studies reveal a reduction in the work function of LaB6-coated MWCNT with respect to its pristine counterpart. The enhanced field emission properties in LaB6-coated MWCNT films are correlated with a change in microstructure and work function.

Original languageEnglish
Article number164309
JournalJournal of Applied Physics
Volume116
Issue number16
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes

Fingerprint

lanthanum
field emission
physical properties
carbon nanotubes
photoelectron spectroscopy
ultraviolet spectroscopy
Raman spectroscopy
Raman spectra
coatings
nanoparticles
transmission electron microscopy
microstructure
scanning electron microscopy
thresholds
augmentation
defects
x rays

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes : Correlation with physical properties. / Patra, Rajkumar; Ghosh, S.; Sheremet, E.; Jha, Menaka; Rodriguez, R. D.; Lehmann, D.; Ganguli, A. K.; Schmidt, H.; Schulze, S.; Hietschold, M.; Zahn, D. R.T.; Schmidt, O. G.

In: Journal of Applied Physics, Vol. 116, No. 16, 164309, 01.01.2014.

Research output: Contribution to journalArticle

Patra, R, Ghosh, S, Sheremet, E, Jha, M, Rodriguez, RD, Lehmann, D, Ganguli, AK, Schmidt, H, Schulze, S, Hietschold, M, Zahn, DRT & Schmidt, OG 2014, 'Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes: Correlation with physical properties', Journal of Applied Physics, vol. 116, no. 16, 164309. https://doi.org/10.1063/1.4898352
Patra, Rajkumar ; Ghosh, S. ; Sheremet, E. ; Jha, Menaka ; Rodriguez, R. D. ; Lehmann, D. ; Ganguli, A. K. ; Schmidt, H. ; Schulze, S. ; Hietschold, M. ; Zahn, D. R.T. ; Schmidt, O. G. / Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes : Correlation with physical properties. In: Journal of Applied Physics. 2014 ; Vol. 116, No. 16.
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