Abstract
The self-assembly process of poly(3-dodecylthiophene) (PDT) on an Au(1 1 1) surface was revealed by Fourier transform infrared reflection absorption spectroscopy (FTIR-RAS). The adsorption kinetics of PDT obeys the time-dependent Langmuir adsorption isotherm. The SAM growth of PDT is accompanied by a transition of the molecular conformation. After the immersion of the gold substrate into the chloroform solution, the PDT coils adsorb on the surface. However, the coils are spread over the surface due to the attractive force between the sulfur atoms of the thiophene-rings and the Au atoms. Simultaneously, the alkyl chain moiety of PDT is provisionally oriented perpendicular to the surface. At equilibrium, the alkyl chain moiety adopts a flat-lying configuration with respect to the surface. The SAM technology allows well-defined film structures to be fabricated and the subtle molecular orientation to be controled, which is impossible by the conventional fabrication methods of thin films such as vacuum-deposited and cast films.
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