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Surface Potentials of Conjugated Molecules on Metal Surfaces: Measurements Using Electrostatic Force Microscopy and Calculations using a Preliminary Physically-Based Model.

Published online by Cambridge University Press:  17 March 2011

S. Howell
Affiliation:
Department of Physics, Purdue University, W. Lafayette, IN 47907, USA
D. Kuila
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
A. W. Ghosh
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
T. Rakshit
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
H. McNally
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
D. Janes
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
S. Datta
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
B. Kashibhatla
Affiliation:
University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla CA, 92093, USA
C. Kubiak
Affiliation:
University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla CA, 92093, USA
R. Reifenberger
Affiliation:
Department of Physics, Purdue University, W. Lafayette, IN 47907, USA
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Abstract

The electrostatic surface potential of self-assembled monolayers (SAMs) of aliphatic and aromatic thiols has been measured using electrostatic force microscopy. The variation of the surface potential of chemisorbed alkanethiols, with respect to bare Au(111), is observed to increase with increasing chain length. The trend is similar to that observed in the literature. A preliminary theoretical model, based on treating the monolayer as a sheet of dipoles, has been used to calculate the surface potential of alkanethiols. Similar measurements on several aromatic thiols, with a symmetric and non-symmetric molecular structure, reveal that non-symmetric systems have significantly higher potential (≥ 170mV) than the symmetric molecules.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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Surface Potentials of Conjugated Molecules on Metal Surfaces: Measurements Using Electrostatic Force Microscopy and Calculations using a Preliminary Physically-Based Model.
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Surface Potentials of Conjugated Molecules on Metal Surfaces: Measurements Using Electrostatic Force Microscopy and Calculations using a Preliminary Physically-Based Model.
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