Solvent Effect on the Self-Assembly of Tetrathiafulvalene at the Liquid-Solid Interface
Date Issued
2010
Date
2010
Author(s)
Chu, Yi-Chen
Abstract
Controlling the formation of 2D pattern by molecules or mixtures of molecules at surfaces is an active area of research. Scanning tunneling microscopy (STM) is a powerful technique to study these morphologies of physisorbed layers at the liquid-solid interface. Herein, we present two methods to control the arrangement of molecules. The first one is to observe tetrathiafulvalene (TTF) in solvents. It is found that 1-phenyloctane and TCB exert as dispersants without coadsorption while n-tetradecane, n-pentadecane, n-hexadecane, and phenyltetradecane coadsorb with TTF. When diluting the concentration of TTF in phenyltetradecane, we observed that phenyltetradecane can be used as template to induce new TTF packing. The other issue is that adding a little chiral molecules to induce the swirl of achiral molecular alkoxy chains. With careful examination of the dodecyloxyl chains from achiral molecules for the STM images, the extending directions of the chains are referred to clockwise and counter-clockwise, but chiral molecules have only one rotational direction for the alkoxy chains. When mixing the two molecules, only one rotational direction of the alkoxy chains was observed. The direction of alkoxy chains from achiral molecules were induced by chiral molecules owing to van der Waals interactions of alkoxy chains.
Subjects
STM
self-assembly
solvent
pattern
Type
thesis
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