Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 107, Issue 48, Pages 13446-13454Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp036319y
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Electrodesorption potentials for alkanethiolate self-assembled monolayers (SAMs) on polycrystalline Cu and Cu(111) surfaces were determined by using electrochemical techniques combined with Auger electron spectroscopy. For a given alkanethiolate SAM, the electrodesorption potentials from Cu are shifted 0.6 V in the negative direction with respect to those found on An. Calculations based on density funtional theory for methanethiolate desorption from Cu(111) show that these potential differences reflect differences in the energy for introducing an electron into the alkanethiolate-metal system and also in the energy to break the alkanethiolate S-head-metal bond. On the other hand, the alkanethiolate-alkanethiol ate interaction energies at SAMs remain practically independent of the substrate.
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