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@ARTICLE{Li:331,
      author       = {Li, C. and Mishchenko, A. and Li, Z. and Pobelov, I. and
                      Wandlowski, Th. and Li, X.Q. and Würthner, F. and Begrets,
                      A. and Evers, F.},
      title        = {{E}lectrochemical gate-controlled electron transport of
                      redox-active single perylene bisimide molecular junctions},
      journal      = {Journal of physics / Condensed matter},
      volume       = {20},
      issn         = {0953-8984},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-331},
      pages        = {374122},
      year         = {2008},
      note         = {This work was supported by the HGF Project 'Molecular
                      Switches', the SPP 1243, the Volkswagen Foundation and the
                      University of Berne and the Research Center Julich. IP
                      acknowledges support of the German Academic Exchange Agency
                      for a PhD fellowship. FE, AA and AB acknowledge support from
                      the SPP 1243 'Center for Functional Nanostructures' situated
                      at Karlsruhe University.},
      abstract     = {We report a scanning tunneling microscopy (STM) experiment
                      in an electrochemical environment which studies a prototype
                      molecular switch. The target molecules were perylene
                      tetracarboxylic acid bisimides modified with pyridine
                      (P-PBI) and methylthiol (T-PBI) linker groups and with bulky
                      tert-butyl-phenoxy substituents in the bay area. At a fixed
                      bias voltage, we can control the transport current through a
                      symmetric molecular wire Au|P-PBI(T-PBI)|Au by variation of
                      the electrochemical 'gate' potential. The current increases
                      by up to two orders of magnitude. The conductances of the
                      P-PBI junctions are typically a factor 3 larger than those
                      of T-PBI. A theoretical analysis explains this effect as a
                      consequence of shifting the lowest unoccupied perylene level
                      (LUMO) in or out of the bias window when tuning the
                      electrochemical gate potential VG. The difference in on/off
                      ratios reflects the variation of hybridization of the LUMO
                      with the electrode states with the anchor groups.
                      I(T)-E(S(T)) curves of asymmetric molecular junctions formed
                      between a bare Au STM tip and a T-PBI (P-PBI) modified
                      Au(111) electrode in an aqueous electrolyte exhibit a
                      pronounced maximum in the tunneling current at -0.740, which
                      is close to the formal potential of the surface-confined
                      molecules. The experimental data were explained by a
                      sequential two-step electron transfer process.},
      keywords     = {J (WoSType)},
      cin          = {IBN-3 / CNI / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB801 / I:(DE-Juel1)VDB381 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21694429},
      UT           = {WOS:000258734700024},
      doi          = {10.1088/0953-8984/20/37/374122},
      url          = {https://juser.fz-juelich.de/record/331},
}