News

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

Single atom chemical identification of complex nanostructures

We have proved the new possibility of the chemical identification of individual atoms in nanostructures and surfaces of the semiconductors with the help of combination of measurement by atomic force microscope (AFM) and theoretical DFT modelling. The suggested method for precise establishment of the atomic and chemical structure significantly improves the possibility of the analysis of surfaces and nanostructures. It has a crucial role not only in understanding of the basic processes of the formation and stability of the semiconductor nanostructures, but also for the study of their chemical and physical properties. It is the chemical composition, which has great impact for the transport of the charge along one-dimensional (1D) atomic chains, which could form the basic elements for developing nanoelectronics.
We have investigated chemical identification of individual atoms in mixed In–Sn chains, grown on a Si(100)-(2 × 1) surface by means of room temperature dynamic noncontact AFM measurements and DFT calculations. We have demonstrated that the chemical nature of each atom in the chain can be identified by means of the measurement of the short-range forces acting between the AFM tip and the atom. On the basis of this method, we have revealed incorporation of silicon atoms from the substrate into the metal chains, which has been ignored until now and it has important role in the formation and stability of 1D chains. Analysis of the measured and calculated short-range forces indicates that even different chemical states of atoms in the chain, influenced by their hybridization, can be distinguished.

M. Setvín, P. Mutombo, M. Ondráček, Z. Majzik, M. Švec, V. Cháb, I. Ostˇádal, P. Sobotík, P. Jelínek
Chemical Identification of Single Atoms in Heterogeneous III-IV Chains on Si(100) Surface by Means of nc-AFM and DFT Calculations
ACS Nano 6 (2012) 6969 - 6976.