Electrochemical scanning tunneling microscope

Source: Wikipedia, the free encyclopedia.

The electrochemical scanning tunneling microscope (EC-STM) is a

electrochemical reactions in solid-liquid interfaces at atomic or molecular scales.[1][2][3]

Development

Electrochemical reactions occur in

ultra high vacuum
(UHV) conditions. In this case, the structure of the surface changed and could not be observed precisely. By using this microscope, however, these problems are resolved.

Operation

In electrolytic solutions, a complicated

anions changes with the potential of the electrode, it is necessary to control the reaction on the electrode. The potentials of the working electrodes (the sample and the tip) are controlled independently against a reference electrode
. In this case, the tunneling bias voltage is the difference between the two potentials. A counter electrode is used to complete the current-carrying circuits with the working electrodes. By using these four electrodes, the electrochemical reaction is controlled precisely by the external voltage, and the surface in liquid can be observed.

References

  1. ^ Liu, H.Y.; Fan, F.-R.F; Lin, C.W.; Bard, A.J. (1986). "Scanning electrochemical and tunneling ultramicroelectrode microscope for high-resolution examination of electrode surfaces in solution". J. Am. Chem. Soc. 108: 3838.
  2. ISSN 0039-6028
    .
  3. ISBN 978-1-4398-3112-0
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Electrochemical_scanning_tunneling_microscope&oldid=1215205523"