Journal
CHEMICAL PHYSICS LETTERS
Volume 498, Issue 1-3, Pages 168-171Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2010.08.065
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Funding
- Ministry of Education, Science and Technology [2009-0087138, 2010-0004592]
- MEST [R31-2008-000-10029-0]
- MKE [10031734]
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Electronic band structures of viologen-doped graphene have been investigated. Pristine graphene film, synthesized by chemical vapor deposition (CVD), showed numerous oxygen-related functional groups, and was annealed to remove oxygen content. Two species of viologen, di-cationic and mono-cationic, were observed in the viologen-doped graphene. The work function of the CVD graphene was dramatically decreased by 1.1 eV after viologen doping. Viologen, therefore, is a strong n-type dopant for graphene, and this report shows the first direct evidence of changing the work function of viologen-doped graphene by cutting-off the kinetic energy of secondary electrons. (C) 2010 Elsevier B. V. All rights reserved.
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