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@ARTICLE{Kisner:153660,
      author       = {Kisner, Alexandre and Heggen, Marc and Mayer, Dirk and
                      Simon, Ulrich and Offenhäusser, Andreas and Mourzina,
                      Youlia},
      title        = {{P}robing the effect of surface chemistry on the electrical
                      properties of ultrathin gold nanowire sensors},
      journal      = {Nanoscale},
      volume       = {6},
      number       = {10},
      issn         = {2040-3372},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2014-03164},
      pages        = {5146 -5155},
      year         = {2014},
      abstract     = {Ultrathin metal nanowires are ultimately analytical tools
                      that can be used to survey the interfacial properties of the
                      functional groups of organic molecules immobilized on
                      nanoelectrodes. The high ratio of surface to bulk atoms
                      makes such ultrathin nanowires extremely electrically
                      sensitive to adsorbates and their charge and/or polarity,
                      although little is known about the nature of surface
                      chemistry interactions on metallic ultrathin nanowires. Here
                      we report the first studies about the effect of functional
                      groups of short-chain alkanethiol molecules on the
                      electrical resistance of ultrathin gold nanowires. We
                      fabricated ultrathin nanowire electrical sensors based on
                      chemiresistors using conventional microfabrication
                      techniques, so that the contact areas were passivated to
                      leave only the surface of the nanowires exposed to the
                      environment. By immobilizing alkanethiol molecules with head
                      groups such as –CH3, –NH2 and –COOH on gold nanowires,
                      we examined how the charge proximity due to
                      protonation/deprotonation of the functional groups affects
                      the resistance of the sensors. Electrical measurements in
                      air and in water only indicate that beyond the gold–sulfur
                      moiety interactions, the interfacial charge due to the
                      acid–base chemistry of the functional groups of the
                      molecules has a significant impact on the electrical
                      resistance of the wires. Our data demonstrate that the
                      degree of dissociation of the corresponding functional
                      groups plays a major role in enhancing the surface-sensitive
                      resistivity of the nanowires. These results stress the
                      importance of recognizing the effect of
                      protonation/deprotonation of the surface chemistry on the
                      resulting electrical sensitivity of ultrathin metal
                      nanowires and the applicability of such sensors for studying
                      interfacial properties using electrodes of comparable size
                      to the electrochemical double layer.},
      cin          = {PGI-8 / JARA-FIT / PGI-5},
      ddc          = {600},
      cid          = {I:(DE-Juel1)PGI-8-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-5-20110106},
      pnm          = {453 - Physics of the Cell (POF2-453) / 424 - Exploratory
                      materials and phenomena (POF2-424)},
      pid          = {G:(DE-HGF)POF2-453 / G:(DE-HGF)POF2-424},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000335148800019},
      pubmed       = {pmid:24589626},
      doi          = {10.1039/c3nr05927h},
      url          = {https://juser.fz-juelich.de/record/153660},
}