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Optical spectroscopy study on the effect of hydrogen adsorption on graphene

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Title
Optical spectroscopy study on the effect of hydrogen adsorption on graphene
Author(s)
Chul Lee; Leconte N.; Kim J.; Doohee Cho; Lyo I.-W.; Choi E.J.
Publication Date
2016-07
Journal
CARBON, v.103, no., pp.109 - 114
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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. © 2016 Elsevier Ltd. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2501
ISSN
0008-6223
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Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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