Atomic force microscopy operating in noncontact electrostatic force mode was used to study the interaction of water with films of alkylamines and alkylsilanes on mica. The films efficiently block water adsorption except in exposed mica areas, where it strongly modifies the mobility of surface ions. We also studied the molecular orientation of octadecylamine molecules forming monolayers and multilayer islands. In monolayer films the molecules bind to mica through the amino group, producing a positive contact potential relative to mica (dipole pointing up). In multilayer films the methyl and amino group terminations are exposed in alternating layers that give rise to alternating values of the contact potential. These findings correlate with low and high friction forces measured in the methyl termination and amino terminations.
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8 September 2005
Research Article|
September 15 2005
Dielectric properties of self-assembled layers of octadecylamine on mica in dry and humid environments
J. J. Benitez;
J. J. Benitez
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Cientificas (CSIC),
Universidad de Sevilla
, 41092 Sevilla, Spain
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O. Rodriguez de la Fuente;
O. Rodriguez de la Fuente
Departamento de Física de Materiales,
Universidad Complutense
, 28040 Madrid, Spain
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I. Díez-Pérez;
I. Díez-Pérez
Laboratori d’Electroquimica i Materials,
Universitat de Barcelona
, Barcelona, Spain
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F. Sanz;
F. Sanz
Laboratori d’Electroquimica i Materials,
Universitat de Barcelona
, Barcelona, Spain
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M. Salmeron
M. Salmeron
a)
Materials Science Division, Lawrence Berkeley National Laboratory,
University of California
, Berkeley, California 94720
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a)
Electronic mail: cbross@lbl.gov
J. Chem. Phys. 123, 104706 (2005)
Article history
Received:
February 11 2005
Accepted:
April 13 2005
Citation
J. J. Benitez, O. Rodriguez de la Fuente, I. Díez-Pérez, F. Sanz, M. Salmeron; Dielectric properties of self-assembled layers of octadecylamine on mica in dry and humid environments. J. Chem. Phys. 8 September 2005; 123 (10): 104706. https://doi.org/10.1063/1.1927507
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