Microfocus infrared ellipsometry characterization of air-exposed graphene flakes

J.W. Weber; K. Hinrichs; M. Gensch; M.C.M. Sanden, van de; T.W.H. Oates

doi:10.1063/1.3624826

Microfocus infrared ellipsometry characterization of air-exposed graphene flakes

J.W. Weber, K. Hinrichs, M. Gensch, M.C.M. Sanden, van de, T.W.H. Oates

Plasma & Materials Processing

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Abstract

Graphene and ultrathin graphite flakes prepared by exfoliation were characterized by microfocus synchrotron infrared mapping ellipsometry. The dielectric function of graphene in a dry-air atmosphere is determined and compared to that of ultrathin graphite, bulk graphite, and gold. The imaginary part of graphene is revealed to be about an order of magnitude higher than that of graphite and comparable to that of gold. Comparing the conductivity to an optical model considering intraband transitions, we discuss the critical effects of environmental exposure, relevant for real-world applications.

Original language	English
Article number	061909
Pages (from-to)	061909-1/3
Journal	Applied Physics Letters
Volume	99
Issue number	6
DOIs	https://doi.org/10.1063/1.3624826
Publication status	Published - 2011

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abstract = "Graphene and ultrathin graphite flakes prepared by exfoliation were characterized by microfocus synchrotron infrared mapping ellipsometry. The dielectric function of graphene in a dry-air atmosphere is determined and compared to that of ultrathin graphite, bulk graphite, and gold. The imaginary part of graphene is revealed to be about an order of magnitude higher than that of graphite and comparable to that of gold. Comparing the conductivity to an optical model considering intraband transitions, we discuss the critical effects of environmental exposure, relevant for real-world applications.",

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AB - Graphene and ultrathin graphite flakes prepared by exfoliation were characterized by microfocus synchrotron infrared mapping ellipsometry. The dielectric function of graphene in a dry-air atmosphere is determined and compared to that of ultrathin graphite, bulk graphite, and gold. The imaginary part of graphene is revealed to be about an order of magnitude higher than that of graphite and comparable to that of gold. Comparing the conductivity to an optical model considering intraband transitions, we discuss the critical effects of environmental exposure, relevant for real-world applications.

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Microfocus infrared ellipsometry characterization of air-exposed graphene flakes

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