Abstract
On chemically modified surfaces of highly oriented pyrolytic graphite and gold-coated mica, the self-assembly of cyanine dye molecules was studied by scanning tunneling microscopy. Through the aid of a polyelectrolyte, which is oppositely charged compared with the dye, the molecules form individual ropes with lengths up to a few hundred nanometers, widths on the order of 10 nm and a few nanometers in height. Scanning tunneling spectroscopy at low temperature reveals a gap region followed by distinctive current steps in the current-voltage characteristics at some positions on the cyanine ropes. In a further experiment, the cyanine ropes were successfully attached to substrates with a gold-palladium electrode pattern.
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