News

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

Molecular recognition on semiconductor surfaces

By capability to spatially resolve the structure of matter at an atomic length scale, STM has played an important role in the development of nano-science. However, it has recently been demonstrated that it is possible to perform STM concurrently with nc-AFM. Here tip-surface conductance (STM) and force interaction (nc-AFM) are measured simultaneously. In this measurement, the same tip is used and exactly the same region of the surface is imaged. Consequently, many of the ambiguities, present when STM and nc-AFM images that are collected in any other way are compared, are naturally circumvented.

In this work, we demonstrate another exciting capability of a combined STM/nc-AFM. Not only can STM and nc-AFM images be acquired at the same time, but new modes of measurement are possible. As we show in the paper, the simultaneous STM/nc-AFM has important implications for the study of molecules and their chemistry on reactive surfaces, such as Si(111)–7x7. In particular, the force response allows adsorbates to be discriminated from common defects such as vacancies or atomic hydrogen even at room temperature. What more the simultaneously acquired STM channel allows the adsorbate’s registry with the surface to be established even when the tip is driven far from the surface (to avoid tip changes during scan). We show that this allows us to determine the attachment sites of small molecules in some cases when this task is impossible with either STM of nc-AFM alone.

It is our belief that the capabilities of the combined STM/nc-AFM have not yet been fully explored and the approach that we describe in this paper could be applied to many other complex systems.

Z. Majzik, B. Drevniok, W. Kaminski, M. Ondraacek, A. B. McLean and P. Jelínek
“Room Temperature Discrimination of Adsorbed Molecules and Attachment Sites on the Si(111)–7 × 7 Surface Using a qPlus Sensor” ACS Nano 7, 2686-2692 (2013)