open access

https://hdl.handle.net/2115/50229

In Situ Study of Ultrathin Film Formation on Au(111) Surface in Propylene Carbonate by Scanning Tunneling Microscopy under Potential Control

英語

surface reconstruction

2002

The Electrochemical Society

Journal of The Electrochemical Society

149(8)

E286-E291

In situ scanning tunneling microscopy (STM) revealed the formation of an adsorbate layer on Au(111) in propylene carbonate (PC) containing 0.1 M LiClO4. The structure of the adsorbate layer was affected by the electrode potential. A comparison with the differential capacitance measurement result suggests that the surface charge of the electrode played an important role. At potentials more positive than the potential of the zero charge (pzc), the growth of the island-like structure on the Au(111) surface was observed. As very similar STM images were obtained in neat PC, it was concluded that the adsorbate layer in this potential region consisted of PC molecules. Both at the pzc and at potentials more negative than the pzc, a herringbone structure was observed showing the reconstructed Au(111) surface. While the surface was uniform at the pzc, there were small holes on the terrace at the latter potentials. The holes were considered to be a defect of a film covering the Au(111) surface with a uniform thickness. The possible adsorbate at the pzc and at potentials more negative than the pzc also consisted of PC molecules, although the adsorbate structure was not clear.

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© The Electrochemical Society, Inc. 2002. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc. 2002 volume 149, issue 8, E286-E291.

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