Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Solid-liquid Interfaces II

O 18.9: Vortrag

Montag, 31. März 2014, 18:00–18:15, WIL A317

EFFECT OF SONICATION TIME ON THE SELF-ASSEMBLY OF SOLVENT MOLECULE ADSORBED ON HOPG (0001) SUBSTRATE STUDIED BY SCANNING TUNNELING MICROSCOPY AT THE LIQUID-_SOLID INTERFACE — •Nguyen Thi Ngoc Ha¹, Thiruvancheril G. Gopakumar², and Michael Hietschold¹ — ¹Institute of Physics, Solid Surfaces Analysis Group,Technische Universität Chemnitz, Germany — ²Indian Institute of Technology, Kanpur, India

Self-assembly at the liquid-solid interface depends on several experimental parameters such as temperature, chemical nature of the solvent, functional groups of the solute molecule, concentration of dissolved molecules, etc. which can influence on the interactions between adsorbate, substrate and solvent. The molecular concentration in a solvent has been shown to be a useful control parameter for self-asssembled molecular pattern formation out of solutions on a crystalline substrate. Sonication treatment of the solutions has been demonstrated to be an efficient method to change these concentrations. The adsorption of TMA (trimesic acid)-undecanol mixture on a HOPG substrate has been investigated. It reveals an adsorption pattern consisting of alternating stripes made of TMA and undecanol solvent molecules which changes in dependence on sonication time. There has been found self -assembled deposition also from pure solvents leading to different patterns which can be controlled by sonication also. These types of studies will give better insight into the adsorption process and may also offer exciting opportunities for nano-patterning.