Abstract
Perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA) in a monomolecular layer was formed onto highly ordered pyrolytic graphite (HOPG) by vacuum deposition. After 17,19-dotetracontadiyne (DTDY) in phenyloctane solution was dripped on the above sample, the tip of a scanning tunneling microscope (STM) was inserted into the solution and scanned to scratch a part of the PTCDA monomolecular layer from the HOPG substrate. DTDY molecules were observed to be adsorbed on the scratched region of the PTCDA molecular layer to form a monomolecular layer. The orientation and size of the DTDY molecular layer could be controlled by selecting the scanning direction and area of the STM tip scratch.
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