Charge transfer through interfacial water inside an STM junction

Charge transfer through thin layers of water between an STM tip and an Au surface has been investigated by using a scanning tunneling microscopy (STM) technique at a relative humidity of 95%. The plateau currents were found to appear at separations larger than several Å where the current decay stops...

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Published inElectrochimica acta Vol. 50; no. 21; pp. 4230 - 4233
Main Authors Yoon, Jae-Seok, Bae, Sang-Eun, Yoon, Jung-Hyun, Song, Moon-Bong, Lee, Chi-Woo J.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Oxford Elsevier Ltd 01.08.2005
Elsevier
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Summary:Charge transfer through thin layers of water between an STM tip and an Au surface has been investigated by using a scanning tunneling microscopy (STM) technique at a relative humidity of 95%. The plateau currents were found to appear at separations larger than several Å where the current decay stops. The polarity dependence of the electrochemical currents was not observed with STM junction between an Au tip and an Au surface, which was observed with STM junction between a Pt/Ir tip and an Au surface. The plateau currents at H 2O saturation were measured to be 10–20% higher than those at D 2O saturation at bias voltages above |0.4| V. The results were rationalized in terms of the electrochemical currents originating mostly from the processes of OH − (OD −) or H 2O (D 2O) on the positive surface with different conductivity between H 2O and D 2O.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.03.074