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dc.contributor.authorTao, Cen_US
dc.contributor.authorLiu, Qen_US
dc.contributor.authorRiddick, BCen_US
dc.contributor.authorCullen, WGen_US
dc.contributor.authorReutt-Robey, Jen_US
dc.contributor.authorWeeks, JDen_US
dc.contributor.authorWilliams, EDen_US
dc.coverage.spatialUnited Statesen_US
dc.date.accessioned2017-02-26T22:07:02Z
dc.date.available2017-02-26T22:07:02Z
dc.date.issued2008-10-28en_US
dc.identifier.urihttp://hdl.handle.net/10919/75174
dc.description.abstractLow-dimensional boundaries between phases and domains in organic thin films are important in charge transport and recombination. Here, fluctuations of interfacial boundaries in an organic thin film, acridine-9-carboxylic acid on Ag(111), have been visualized in real time and measured quantitatively using scanning tunneling microscopy. The boundaries fluctuate via molecular exchange with exchange time constants of 10-30 ms at room temperature, with length-mode fluctuations that should yield characteristic f(-1/2) signatures for frequencies less than approximately 100 Hz. Although acridine-9-carboxylic acid has highly anisotropic intermolecular interactions, it forms islands that are compact in shape with crystallographically distinct boundaries that have essentially identical thermodynamic and kinetic properties. The physical basis of the modified symmetry is shown to arise from significantly different substrate interactions induced by alternating orientations of successive molecules in the condensed phase. Incorporating this additional set of interactions in a lattice-gas model leads to effective multicomponent behavior, as in the Blume-Emery-Griffiths model, and can straightforwardly reproduce the experimentally observed isotropic behavior. The general multicomponent description allows the domain shapes and boundary fluctuations to be tuned from isotropic to highly anisotropic in terms of the balance between intermolecular interactions and molecule-substrate interactions.en_US
dc.format.extent16418 - 16425 page(s)en_US
dc.languageengen_US
dc.relation.urihttp://www.ncbi.nlm.nih.gov/pubmed/18765797en_US
dc.titleDynamic interfaces in an organic thin film.en_US
dc.typeEditorial
dc.description.versionPublished (Publication status)en_US
dc.title.serialProc Natl Acad Sci U S Aen_US
dc.identifier.doihttps://doi.org/10.1073/pnas.0805811105
dc.identifier.volume105en_US
dc.identifier.issue43en_US
dc.identifier.eissn1091-6490en_US
pubs.organisational-group/Virginia Tech
pubs.organisational-group/Virginia Tech/All T&R Faculty
pubs.organisational-group/Virginia Tech/Science
pubs.organisational-group/Virginia Tech/Science/COS T&R Faculty
pubs.organisational-group/Virginia Tech/Science/Physics


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