Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Structure of Solid/Liquid Interfaces I

O 82.6: Vortrag

Donnerstag, 10. März 2016, 11:45–12:00, H6

Solvent- and deposition temperature-dependent 2D supramolecular assemblies of trimesic acid at the liquid-graphite interface revealed by scanning tunneling microscopy — •Yen D.C Nguyen, Lars Smykalla, Ha N.T Nguyen, and Michael Hietschold — TU-Chemnitz, Institute of Physics, D-09107 Chemnitz, Germany

By using scanning tunneling microscopy (STM), the polymorphism of self-assembly of trimesic acid molecules at the liquid-solid interface to graphite was investigated for different kind of solvents and temperatures of the pre-heated during deposited substrate. TMA was dissolved in phenyloctane, octanoic acid and undecanol, which have different polarity. At elevated substrate temperatures, various periodic assemblies of TMA can be obtained. By increasing the temperature of the pre-heated substrate, the specific 2D supramolecular network structure and the corresponding packing density can be precisely tuned in each kind of the solvents studied. The results found by STM are explained by the increased concentration of the solution at the pre-heated substrate as well as the higher mobility of the solute molecules enforcing the interactions between the molecules, in particular different hydrogen bonding motifs. Our interpretation is supported by optimizing each structure and comparing their total interactions energy calculated by PM6-DH+.