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STM Studies of Electrode/Electrolyte Interfaces and Silicon Surface Reactions in Controlled Atmospheres

Published online by Cambridge University Press:  10 February 2011

Christopher P. Wade ,
Huihong Luo ,
William L. Dunbar ,
Matthew R. Linford  and
Christopher E.D. Chidsey
Christopher P. Wade
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305–5080
Huihong Luo
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305–5080
William L. Dunbar
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305–5080
Matthew R. Linford
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305–5080
Christopher E.D. Chidsey
Affiliation:
Department of Chemistry, Stanford University, Stanford, CA 94305–5080
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Abstract

We have assembled a scanning tunneling microscope with an inverted sample that allows the sample surface to be contacted by fluid electrolytes in a controlled atmosphere. A hanging meniscus is formed between the sample and a small cup surrounding the tunneling tip. In-situ imaging of the electrode/electrolyte interface is conveniently achieved with clean samples under potentiostatic control. The functioning of the microscope is illustrated by the imaging of the electrodeposition of copper on gold. This microscope has been used to image hydrogen-terminated silicon surfaces and to demonstrate that islands, tentatively assigned as silicon oxide, are formed on rinsing in water but can be avoided if the surface is not rinsed on withdrawal from the ammonium fluoride etching solution. Finally, STM shows that the convenient, gas-phase photochlorination of H-Si(111) produces the simple Cl-Si(111)(1×1) structure with little or no etching of the silicon surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 451: Symposium P – Electrochemical Synthesis and Modification , 1996 , 173
Copyright
Copyright © Materials Research Society 1997

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References

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