Surface charge induced order-disorder transition in an organic monolayer

F. Cunha, N. J. Tao

Research output: Contribution to journalArticlepeer-review

111 Scopus citations


Monolayer 2-2′ bipyridine on Au(111) has been studied by scanning tunneling microscopy as a function of surface charge density. At positive charges, the planar molecules stand vertically on the surface and form polymeric chains in which they stack with a repeat distance of ∼3.3 Å. The chains are randomly oriented at low charges, but they begin to align in parallel as the charge density reaches ∼13 μC/cm2. The transition is fully reversible by lowering the charge below the critical density. The real-space images reveal the molecular-scale processes during the transition.

Original languageEnglish (US)
Pages (from-to)2376-2379
Number of pages4
JournalPhysical Review Letters
Issue number12
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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