Volume 253, Issue 12 pp. 2355-2361
Original Paper

Stress and charge transfer in uniaxially strained CVD graphene

Milan Bousa

Corresponding Author

Milan Bousa

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

Faculty of Science, Department of Inorganic Chemistry, Charles University in Prague, Albertov 6, CZ 128 43 Prague 2, Czech Republic

Corresponding author: e-mail [email protected], Phone: +420 266 053 955, Fax: +420 286 582 307

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George Anagnostopoulos

George Anagnostopoulos

Institute of Chemical Engineering Sciences, Foundation for Research and Technology − Hellas (FORTH/ICE-HT), P.O. Box 1414, 265 04 Patras, Greece

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Elena del Corro

Elena del Corro

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

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Karolina Drogowska

Karolina Drogowska

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

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Jan Pekarek

Jan Pekarek

Faculty of Electrical Engineering and Communication, Centre of Sensors, Information and Communication Systems, Brno University of Technology, Technicka, 3058/10 CZ 616 00 Brno, Czech Republic

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Ladislav Kavan

Ladislav Kavan

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

Faculty of Science, Department of Inorganic Chemistry, Charles University in Prague, Albertov 6, CZ 128 43 Prague 2, Czech Republic

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Martin Kalbac

Martin Kalbac

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

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John Parthenios

John Parthenios

Institute of Chemical Engineering Sciences, Foundation for Research and Technology − Hellas (FORTH/ICE-HT), P.O. Box 1414, 265 04 Patras, Greece

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Konstantinos Papagelis

Konstantinos Papagelis

Institute of Chemical Engineering Sciences, Foundation for Research and Technology − Hellas (FORTH/ICE-HT), P.O. Box 1414, 265 04 Patras, Greece

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Costas Galiotis

Costas Galiotis

Institute of Chemical Engineering Sciences, Foundation for Research and Technology − Hellas (FORTH/ICE-HT), P.O. Box 1414, 265 04 Patras, Greece

Department of Chemical Engineering, University of Patras, 26504 Patras, Greece

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Otakar Frank

Otakar Frank

J. Heyrovsky Institute of Physical Chemistry of the AS CR v.v.i., Dolejskova 2155/3, CZ 182 23 Prague 8, Czech Republic

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First published: 14 July 2016
Citations: 13

Abstract

Mechanical properties of graphene prepared by chemical vapour deposition (CVD) are not easily comparable to the properties of nearly perfect graphene prepared by mechanical cleavage. In this work, we attempt to investigate the mechanical performance of CVD graphene (simply supported or embedded in polymer matrix), transferred by two different techniques, under uniaxial loading with simultaneous in situ monitoring by Raman microspectroscopy. The level of charge transfer doping and strain is assessed using the vector analysis modified for uniaxial strain. The strain distribution across the samples varies significantly, owing to the growth and transfer process, which induces wrinkles and faults in the CVD graphene. In simply supported specimens, the stress transfer efficiency is generally very low and the changes in Raman spectra are dominated by variations in the charge transfer originating from the realignment of the domains on the substrate upon the application of strain. In contrast, samples covered with an additional polymer layer exhibit an improved stress transfer efficiency, and the alterations of charge doping levels are negligible. In fully embedded specimens, the variations in stress transfer efficiencies are caused by the size of the effective graphene domains defined by cracks, folds and/or wrinkles.

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