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Title: Precessed electron beam electron energy loss spectroscopy of graphene: Beyond channelling effects

The effects of beam precession on the Electron Energy Loss Spectroscopy (EELS) signal of the carbon K edge in a 2 monolayer graphene sheet are studied. In a previous work, we demonstrated the use of precession to compensate for the channeling-induced reduction of EELS signal when in zone axis. In the case of graphene, no enhancement of EELS signal is found in the usual experimental conditions, as graphene is not thick enough to present channeling effects. Interestingly, though it is found that precession makes it possible to increase the collection angle, and, thus, the overall signal, without a loss of signal-to-background ratio.
Authors:
;  [1] ;  [2] ; ; ;  [1] ;  [3] ;  [3] ;  [4]
  1. LENS, MIND-IN2UB, Departament d'Electrònica, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain)
  2. (Spain)
  3. AppFive LLC, 1095 W Rio Salado Pkway, Suite 110, Tempe, Arizona 85281 (United States)
  4. (Belgium)
Publication Date:
OSTI Identifier:
22314513
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHANNELING; ELECTRON BEAMS; ELECTRONS; ENERGY-LOSS SPECTROSCOPY; GRAPHENE; TWO-DIMENSIONAL CALCULATIONS