2009/06/30 by Alpha T N'Diaye, Alpha T. N'Diaye, Raoul van Gastel +13
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Advanced Materials and Mechanics #Bending #Diffraction #Graphene #Graphene research and applications #Hysteresis #Microscopy #Relaxation (psychology) #Temperature cycling #Wrinkle #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1088/1367-2630/11/11/113056
Supplementary information: S1: Photo electron emission microscopy and LEEM measurements of rotational domains, STM data of a delaminated bulge around a dislocation. S2: Movie with increasing brightness upon wrinkle formation as in figure 4. v2: Major revision including new experimental data
arxiv created 2009/09/15 · openalex publication_date 2009/11/30 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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.