Abstract
Using X-ray diffraction and Fourier-transform infrared (FT-IR) spectroscopy, we elucidated the molecular orientation in self-assembled monolayers (SAM) and vacuum deposited films of terthiophene. Terthiophene in the SAM aligns parallel to the gold substrate. On the other hand, in the vacuum deposited films, the long axis of terthiophene aligns along the normal to the surface. Although our results contradict the quantum calculations, which predict that thiophene would not interact with gold significantly, we experimentally demonstrated the interaction between terthiophene and gold. A theoretical fitting of FT-IR signals, the out-of-plane –CH and –CH=CH– vibration at 680 cm-1, revealed the SAM formation of terthiophene to be a Langmuir type of adsorption.
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