Influence of a gold substrate on the optical properties of graphene

Aleksandar Matković; Manisha Chhikara; Marijana Milićević; Uroš Ralević; Borislav Vasić; Djordje Jovanović; Milivoj R. Belić; Gvido Bratina; Radoš Gajić

doi:10.1063/1.4905242

Influence of a gold substrate on the optical properties of graphene

Aleksandar Matković, Manisha Chhikara, Marijana Milićević, Uroš Ralević, Borislav Vasić, Djordje Jovanović, Milivoj R. Belić, Gvido Bratina, Radoš Gajić

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13 Citations (Scopus)

Abstract

Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene and a gold substrate, and the consequent changes of graphene's complex refractive index on gold. A strong blue shift, as much as 350-meV, of the prominent absorption peak (exciton-shifted M-point Van Hove singularity in the ultraviolet range) of graphene has been observed, with respect to the peak position for the sample on an insulating substrate where this peak was observed at about 4.55-eV. The results show that an interaction between graphene and a gold substrate can be characterized through the change of graphene's optical properties. In addition, the effects that a water layer trapped between graphene and gold during the transfer process has on the charge transfer between graphene and the gold substrate have been investigated.

Original language	English
Article number	015305
Journal	Journal of Applied Physics
Volume	117
Issue number	1
DOIs	https://doi.org/10.1063/1.4905242
Publication status	Published - 7 Jan 2015
Externally published	Yes

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title = "Influence of a gold substrate on the optical properties of graphene",

abstract = "Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene and a gold substrate, and the consequent changes of graphene's complex refractive index on gold. A strong blue shift, as much as 350-meV, of the prominent absorption peak (exciton-shifted M-point Van Hove singularity in the ultraviolet range) of graphene has been observed, with respect to the peak position for the sample on an insulating substrate where this peak was observed at about 4.55-eV. The results show that an interaction between graphene and a gold substrate can be characterized through the change of graphene's optical properties. In addition, the effects that a water layer trapped between graphene and gold during the transfer process has on the charge transfer between graphene and the gold substrate have been investigated.",

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T1 - Influence of a gold substrate on the optical properties of graphene

AU - Matković, Aleksandar

AU - Chhikara, Manisha

AU - Milićević, Marijana

AU - Ralević, Uroš

AU - Vasić, Borislav

AU - Jovanović, Djordje

AU - Belić, Milivoj R.

AU - Bratina, Gvido

AU - Gajić, Radoš

PY - 2015/1/7

Y1 - 2015/1/7

N2 - Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene and a gold substrate, and the consequent changes of graphene's complex refractive index on gold. A strong blue shift, as much as 350-meV, of the prominent absorption peak (exciton-shifted M-point Van Hove singularity in the ultraviolet range) of graphene has been observed, with respect to the peak position for the sample on an insulating substrate where this peak was observed at about 4.55-eV. The results show that an interaction between graphene and a gold substrate can be characterized through the change of graphene's optical properties. In addition, the effects that a water layer trapped between graphene and gold during the transfer process has on the charge transfer between graphene and the gold substrate have been investigated.

AB - Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene and a gold substrate, and the consequent changes of graphene's complex refractive index on gold. A strong blue shift, as much as 350-meV, of the prominent absorption peak (exciton-shifted M-point Van Hove singularity in the ultraviolet range) of graphene has been observed, with respect to the peak position for the sample on an insulating substrate where this peak was observed at about 4.55-eV. The results show that an interaction between graphene and a gold substrate can be characterized through the change of graphene's optical properties. In addition, the effects that a water layer trapped between graphene and gold during the transfer process has on the charge transfer between graphene and the gold substrate have been investigated.

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Influence of a gold substrate on the optical properties of graphene

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