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Candidates for molecular nanowires for the interconnection of gold nanoelectrodes in a molecular-scale electronic device are to be found in end-functionalised poly(para-phenyleneethynylene)s. The self-assembly of these polymers was studied on atomically flat solid substrates. On graphite, sub-molecularly resolved imaging with scanning tunneling microscopy revealed nanorods in a 2 D nematic-like texture, while on mica, scanning force microscopy (see picture) shows that the nanorods can self-assemble into highly oriented micrometer-long nanoribbons with a molecular cross-section.
Samorı́ et al. (1999) studied this question.