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@ARTICLE{Mennicken:865210,
      author       = {Mennicken, Max and Peter, Sophia Katharina and Kaulen,
                      Corinna and Simon, Ulrich and Karthäuser, Silvia},
      title        = {{C}ontrolling the {E}lectronic {C}ontact at the
                      {T}erpyridine/{M}etal {I}nterface},
      journal      = {The journal of physical chemistry / C C, Nanomaterials and
                      interfaces},
      volume       = {123},
      number       = {35},
      issn         = {1932-7455},
      address      = {Washington, DC},
      publisher    = {Soc.66306},
      reportid     = {FZJ-2019-04744},
      pages        = {21367 - 21375},
      year         = {2019},
      abstract     = {Terpyridine derivatives reveal rich coordination chemistry
                      and are frequently used to construct reliable
                      metallo-supramolecular wires, which are promising candidates
                      for optoelectronic or nanoelectronic devices. Here, we
                      examine especially the terpyridine/electrode interface,
                      which is a critical point in these organic/inorganic hybrid
                      architectures and of utmost importance with respect to the
                      device performance. We use the approach to assemble
                      nanodevices by immobilization of single
                      terpyridine-functionalized gold nanoparticles with a
                      diameter of 13 nm in between nanoelectrodes with a
                      separation of about 10 nm. Conductance measurements on the
                      formed double-barrier tunnel junctions reveal several
                      discrete conductance values in the range of 10–9–10–7
                      S. They can be attributed to distinct terpyridine/electrode
                      contact geometries by comparison with conductance values
                      estimated based on the Landauer formula. We could clearly
                      deduce that the respective terpyridine/metal contact
                      determines the length of the tunneling path through the
                      molecule and thus the measured device conductance.
                      Furthermore, the formation of a distinct
                      terpyridine/electrode contact geometry correlates with the
                      chemical pretreatment of the terpyridine ligand shell of the
                      gold nanoparticles with an alkaline solution. By applying
                      infrared reflection absorption spectroscopy, we found that
                      only a chemical treatment with a concentrated ammonia
                      solution results in effective deprotonation of the
                      terpyridine anchor group. This enables the electrical
                      contact to the middle pyridyl ring and thus a short
                      tunneling path through the molecule corresponding to a high
                      conductance value. These findings indicate a way to control
                      the contact geometry at the terpyridine/metal interface,
                      which is a prerequisite for reliable nanodevices based on
                      this class of molecules.},
      cin          = {PGI-7 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {524 - Controlling Collective States (POF3-524)},
      pid          = {G:(DE-HGF)POF3-524},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000484882500006},
      doi          = {10.1021/acs.jpcc.9b05865},
      url          = {https://juser.fz-juelich.de/record/865210},
}