Phase transition of thiophene molecules on Au(1 1 1) in solution |
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Authors: | Gui-Jin SuHui-Min Zhang Li-Jun Wan Chun-Li Bai |
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Affiliation: | Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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Abstract: | The orientation and packing arrangement of thiophene molecules on a well-defined Au(1 1 1) surface in 0.1 M HClO4 solution have been investigated as a function of applied potentials by in situ scanning tunneling microscopy (STM) and electrochemical method. Thiophene molecules are found to form highly ordered adlayers in the double layer region. High-resolution STM images reveal different adlayer structures. Thiophene molecules take flat-lying and vertical orientation at 0.3 and 0.6 V, respectively. Compared with the results of electrochemical measurement, we concluded that the phase transition of thiophene on Au(1 1 1) occurs as the potential is changed between 0.1 and 0.65 V. |
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Keywords: | Gold Surface thermodynamics (including phase transitions) Electrochemical methods Scanning tunneling microscopy |
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