N'Diaye, Alpha T.; van Gastel, Raoul; Martínez-Galera, Antonio J; Coraux, Johann; Hattab, Hichem; Meyer zu Heringdorf, Frank; Wall, Dirk; Horn-von Hoegen, Michael; Gomez-Rodriguez, José M; Poelsema, Bene; Busse, Carsten; Michely, Thomas:
In situ observation of stress relaxation in epitaxial graphene
In: New Journal of Physics (NJP), Band 11 (2009), S. 113056
2009Artikel/Aufsatz in ZeitschriftOA Gold
Physik (inkl. Astronomie)Fakultät für Physik » Experimentalphysik
Damit verbunden: 1 Publikation(en)
Titel in Englisch:
In situ observation of stress relaxation in epitaxial graphene
Autor*in:
N'Diaye, Alpha T.;van Gastel, Raoul;Martínez-Galera, Antonio J;Coraux, Johann;Hattab, HichemUDE
LSF ID
49259
Sonstiges
der Hochschule zugeordnete*r Autor*in
;
Meyer zu Heringdorf, FrankUDE
LSF ID
48700
ORCID
0000-0002-5878-2012ORCID iD
Sonstiges
der Hochschule zugeordnete*r Autor*in
;
Wall, DirkUDE
LSF ID
48960
Sonstiges
der Hochschule zugeordnete*r Autor*in
;
Horn-von Hoegen, MichaelUDE
GND
1201039908
LSF ID
10366
ORCID
0000-0003-0324-3457ORCID iD
Sonstiges
der Hochschule zugeordnete*r Autor*in
;
Gomez-Rodriguez, José M;Poelsema, Bene;Busse, Carsten;Michely, Thomas
Erscheinungsjahr:
2009
Open Access?:
OA Gold

Abstract:

Upon cooling, branched line defects develop in epitaxial graphene grown at high temperature on Pt(111) and Ir(111). Using atomically resolved scanning tunneling microscopy, we demonstrate that these defects are wrinkles in the graphene layer, i.e. stripes of partially delaminated graphene. With low energy electron microscopy (LEEM), we investigate the wrinkling phenomenon in situ. Upon temperature cycling, we observe hysteresis in the appearance and disappearance of the wrinkles. Simultaneously with wrinkle formation a change in bright field imaging intensity of adjacent areas and a shift in the moiré spot positions for micro diffraction of such areas takes place. The stress relieved by wrinkle formation results from the mismatch in thermal expansion coefficients of graphene and the substrate. A simple one-dimensional model taking into account the energies related to strain, delamination and bending of graphene is in qualitative agreement with our observations.