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DOI: 10.5445/IR/1000048011

STM study of oligo(phenylene-ethynylene)s

Thiele, C.; Gerhard, L.; Eaton, T.R.; Torres, D.M.; Mayor, M.; Wulfhekel, W.; Löhneysen von, H.; Lukas, M.

Abstract:
A detailed scanning tunneling microscopy (STM) study of two variants of oligo(phenylene ethynylene) (OPE) molecules is presented. These molecules might serve as molecular wires up to ~ 5 nm in length. Self-assembled arrangements as well as single molecules on a Au(111) surface were analyzed. The molecular orbitals were directly imaged and are compared to density functional theory calculations. Sub-molecular resolution images of both molecules directly display the chemical structure. One of the OPE variants was lifted off the surface by the STM tip to measure the single-molecule conductance in order to explain previously reported low conduction values. Furthermore, we present a detailed analysis of a tip-induced conformational switching of the hexyl side groups from all-trans to a nonlinear conformation, which was observed for both variants.


Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1367-2630
URN: urn:nbn:de:swb:90-480118
KITopen ID: 1000048011
HGF-Programm 43.21.02; LK 01
Erschienen in New journal of physics
Band 17
Heft 5
Seiten 053043/1-11
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Condensed matter: electrical, magnetic and optical; Surfaces, interfaces and thin films
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