Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 776, Issue -, Pages 40-48Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.06.039
Keywords
Self-assembly; Gold-single crystals; Cyclic voltammetry; EC-STM; Benzoic acid
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Funding
- Hanoi Universtity of Science and Technology [T2016-075]
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In situ STM and electrochemical methods have been used to study the adlayer structures of benzoic acid (BA) at electrified interfaces between Au(100) single crystal in contact with 0.1 M HClO4 solution. Depending on the electrode potential, BA formed four highly long-range ordered adlayers on Au(100) substrate. The structure of adlayers was imaged with molecular resolution. At the negative charge, planar-oriented BA molecules formed dimers decorated on electrode surfaces referred as linear dimer structure, tilted stripe phase, and chicken-wire pattern, which were stabilized via hydrogen bonding and by weak substrate-absorbate interaction. Increasing the electrode potential to positive charge densities causes to the desorption of the physisorbed hydrogen-bonded network and the formation of an ordered chemisorbed adlayers accompanied by the reorientation of BA molecules from planar to a tilted orientation in the chemisorbed region, which denoted as double stacking row phase. Furthermore, potential-induced formation and dissolution of BA monolayers were investigated. Structural transitions between the various types of ordered adlayers occurs according to a nucleation and growth mechanism. (C) 2016 Elsevier B.V. All rights reserved.
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