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Current-voltage characteristics of an Lb monolayer of didecylammonium tricyanoquinodimethanide measured between macroscopic gold electrodes

Xu, T.; Morris, T.A.; Szulczewski, G.J.; Metzger, R.M.; Szablewski, M.

Current-voltage characteristics of an Lb monolayer of didecylammonium tricyanoquinodimethanide measured between macroscopic gold electrodes Thumbnail


Authors

T. Xu

T.A. Morris

G.J. Szulczewski

R.M. Metzger



Abstract

Didecylammonium tricyanoquinodimethanide, a zwitterionic molecule of the type D+––A–(where D+= ammonium, = ethylene bridge, and A–= tricyanoquinodimethanide), forms a Pockels–Langmuir monolayer film at the air–water interface. The molecules can be transferred quantitatively as a Langmuir–Blodgett (LB) monolayer onto a gold surface. Using the cold-gold evaporation technique, a set of several macroscopic gold electrode pads were evaporated atop the LB monolayer. Pads which had macroscopic defects were electrical short circuits, but across many pads finite electrical currents were observed as a function of applied bias; however, no obvious electrical rectification was found. The monolayer thickness on a gold substrate was measured by XPS to be 22 Å. Reflection-absorption infrared spectroscopy (RAIRS) indicates that the molecules have a preferred orientation in the film, but are not well ordered. Angle-resolved X-ray photoelectron spectroscopy (XPS) suggests that many of the molecules are oriented anti-parallel to each other, possibly because dipole–dipole forces favor such an anti-parallel orientation. This latter observation helps to explain why no electrical rectification was found.

Journal Article Type Article
Publication Date Sep 4, 2002
Deposit Date Jan 9, 2009
Publicly Available Date Nov 18, 2014
Journal Journal of Materials Chemistry
Print ISSN 0959-9428
Electronic ISSN 1364-5501
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 12
Issue 10
Pages 3167-3171
DOI https://doi.org/10.1039/b203789k
Keywords Self-assembled monolayers, Hexadecylquinolinium tricyanoquinodimethanide, Electrical rectification, Zwitterions.
Public URL https://durham-repository.worktribe.com/output/1582189

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