Optical spectroscopy study on the effect of hydrogen adsorption on graphene

Chul Lee, N. Leconte, Jiho Kim, Doohee Cho, In Whan Lyo, E. J. Choi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effect of increasing hydrogen adsorption on graphene is investigated using optical transmission spectroscopy over a wide spectrum, from the far-infrared (FIR) to the UV domain. For low hydrogen concentration, the absorption intensities of the interband transitions occurring in the Dirac band (mid-IR and visible) and the M-point van Hove singularity (UV) decrease with increasing hydrogen coverage. This H-coverage dependent spectral change is quantified successfully using the effective medium theory. For highest hydrogen coverage, the optical absorbance decrease culminates in an actual band-gap opening of more than 6 eV. These measurements provide experimental confirmation of predicted large values of direct bandgap transitions in one-sided hydrogenated graphene. Finally, the optical conductivity in the Far-IR regime is behaving in a non-Drude type manner along with the hydrogenation, implying H- induced localization of the free Dirac π electrons.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalCarbon
Volume103
DOIs
Publication statusPublished - 2016 Jul 1

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Graphite
Graphene
Hydrogen
Adsorption
Energy gap
Optical conductivity
Light transmission
Electron transitions
Hydrogenation
Spectroscopy
Infrared radiation
Optical spectroscopy
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Lee, Chul ; Leconte, N. ; Kim, Jiho ; Cho, Doohee ; Lyo, In Whan ; Choi, E. J. / Optical spectroscopy study on the effect of hydrogen adsorption on graphene. In: Carbon. 2016 ; Vol. 103. pp. 109-114.
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Optical spectroscopy study on the effect of hydrogen adsorption on graphene. / Lee, Chul; Leconte, N.; Kim, Jiho; Cho, Doohee; Lyo, In Whan; Choi, E. J.

In: Carbon, Vol. 103, 01.07.2016, p. 109-114.

Research output: Contribution to journalArticle

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T1 - Optical spectroscopy study on the effect of hydrogen adsorption on graphene

AU - Lee, Chul

AU - Leconte, N.

AU - Kim, Jiho

AU - Cho, Doohee

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AU - Choi, E. J.

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