Mobility of ionic hydrates
Jun/18 paper in Nature about mobility of ionic hydrates studied by high-resolution AFM. »more info

O. Wichterle prize
Jun/18 O. Stetsovych received O. Wichterle prize for outstanding young scientists at the AS CR. »more info

Piezoelectricity of single molecules
Jan/18 paper in JACS demonstrating piezoelectric effect on single molecules »more info

Resolving water clusters with AFM
Jan/18 paper in Nature Comm. about a method allowing high-resolution AFM of weakly coupled clusters »more info

High-resolution SPM imaging
Sep/17 paper in PRL reporting AFM/STM/IETS imaging »more info

Electronegativity of atoms
May/17 paper in Nature Comm. »more info

Transfer of chirality
Feb/17 Paper published in Nature Chemistry including News&Views. »more info

Towards chemical recognition of molecules
Aug/16 Paper published in ACS Nano. »more info

Odehnal award
June/16 O. Stetsovych received Odehnal award »more info

Praemium Academiae
June/16 P. Jelinek received CAS award »more info

Imaging electrostatic field
May/16 paper in Nature Comm. »more info

O. Wichterle prize
May/16 P. Hapala received O. Wichterle prize for outstanding young scientists at the AS CR. »more info

On-surface chemical synthesis
Apr/16 paper in JACS »more info

Structural and Electronic Properties of Nitrogen-Doped Graphene
Mar/16 Paper in Phys. Rev. Lett. »more info

Role of the electrostatic force in AFM images
Mar/16 Paper in Phys. Rev. Lett »more info

Charge transport between two molecules
Sep/15 Paper in Phys. Rev. Lett »more info

The best poster ECOSS-31
Sep/15 Our work has been selected as the best poster in the ECOSS-31 conference. »more info

Paper in ACS Nano
Aug/15 Novel way of B,N-co doping of graphene demonstrated. »more info

paper in PRL and Physics
Aug/15 Our work has been published in Phys. Rev. Lett highlighted as Synopsis in Physics. »more info

Paper in Nature Comm.
Jul/15 High-resolution AFM images reported at room temperature. »more info

Paper in Nano Letters
Jun/15 The current and the force used for controlled atomic switching of silicon tetramer. »more info

O. Wichterle prize
May/15 M. Ondracek received O. Wichterle prize for outstanding young scientists at the AS CR. »more info

Understanding of interaction mechanism between fullerenes and graphene

We concentrated on the interactions between fullerenes and a single-layer epitaxial graphene grown on SiC(0001), which is a model system for studying van der Waals forces. In this system, we found that the cohesion among the fullerenes is more important than the binding to the surface, despite the presence of a superlattice corrugation. Islands of the molecules were found floating on the surface and pinned to surface defects or steps.

fullerenes on graphene

Fig.1: STM images of fullerenes deposited on a) graphene and b) buffer layer of SiC(0001) clean surface. The insets show details of the fullerene molecular orbitals and a fast fourier transform showing a 4x4 periodicity of the structure.

In particular, a system was studied consisting of fullerenes deposited on a partly graphitized surface of the SiC(0001). A significantly different interaction of the fullerenes with single-layer epitaxial graphene and the residual parental reconstruction has been compared by means of variable temperature scanning tunneling microscopy (Fig.1). On graphene the fullerenes arrange into planar islands at 40K with a 4x4 periodicity, held together exclusively by the van der Waals forces, which is manifested by collective movement of the islands upon manipulation with the scanning probe. This has been confirmed by extensive density functional calculations taking into account the van der Waals contribution. Furthermore, the most energetically favorable configuration evaluated by the theory corresponds to the experimentally observed internal orientation of the fulerene in the 4x4 reconstruction. The orientation of the molecule was determined by matching the experimental to simulated STM images considering a moving fullerene attached to the probe, that was the origin of a changing intramolecular contrast.

We received the Best Poster award in graphene and carbon nanotubes at ICN+T 2012 conference in Paris for work entitled "Fullerenes on Graphene held together by van der Waals interaction" presented by Dr M. Svec.

M. Švec, P. Merino, Y. J. Dappe, C. González, E. Abad, P. Jelínek, J. A. Martín-Gago, van der Waals interactions mediating the cohesion of fullerenes on graphene Phys. Rev. B 86 (2012) 121407(R) - 121412(R).