Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 100: Metal Substrates: Adsorption and Reactivity
O 100.9: Talk
Friday, March 20, 2015, 12:30–12:45, MA 043
The adsorption and recognition of carborane thiols molecules on the Au(111) surface — •Jan Berger1, Martin Švec1, Pingo Mutombo1, Tomáš Baše2, Wojciech Kamiński3, and Pavel Jelínek1 — 1Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, CZ-16200, Prague, Czech Republic — 2Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Husinec-Rez, c.p. 1001, Czech Republic — 3Institute of Experimental Physics, University of Wrocław, plac Maksa Borna 9, 50-204 Wrocław, Poland
We present simultaneous qPlus AFM/STM measurements of carborane molecules functionalized by thiol groups (1,2-(HS)2-1,2-C2B10H10) deposited on Au (111) surface. The morphology of different adsorption configurations of molecules on Au (111), depending on surface coverage, was characterized. At low coverage, carboranes adopt a mobile triangle configuration with one molecule up, two molecules down.
Using df(z)/I(z) local spectroscopy we revealed, that two different molecule configuration show distinct transport and mechanical properties. Thus we attribute this observation to different binding mechanism to the substrate. Molecules tend to create multi-domain islands at higher coverage. The STM/AFM experimental findings are complemented - and supported - by state-of-the-art DFT calculations.