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@ARTICLE{Yuan:863485,
      author       = {Yuan, Xiaobo and Wolf, Nikolaus and Mayer, Dirk and
                      Offenhäusser, Andreas and Wördenweber, Roger},
      title        = {{V}apor-{P}hase {D}eposition and {E}lectronic
                      {C}haracterization of 3-{A}minopropyltriethoxysilane
                      {S}elf-{A}ssembled {M}onolayers on {S}ilicon {D}ioxide},
      journal      = {Langmuir},
      volume       = {35},
      number       = {25},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2019-03539},
      pages        = {8183-8190},
      year         = {2019},
      abstract     = {Although organosilanes, especially
                      3-aminopropyltriethoxysilane (APTES), are commonly used to
                      functionalize oxide substrates for a variety of applications
                      ranging from molecular/bio sensors and electronics to
                      protective layers, a reliable and controlled deposition of
                      these molecules re-mains a major obstacle. In this study, we
                      use surface potential analyses to record and optimize the
                      gas-phase deposition of APTES self-assembled monolayers
                      (SAMs) and to determine the resulting change of the
                      electrokinetic potential and charge at the solid–liquid
                      interface when the system is exposed to an electrolyte.
                      Using a gas-phase molecular layer deposition setup with an
                      in situ molecule deposition sensor, APTES is deposited at
                      room temperature onto ozone-activated SiO2. The resulting
                      layers are characterized using various techniques ranging
                      from contact angle analysis, ellipsometry, fluorescence
                      microscopy, X-ray photoelectron spectroscopy, and
                      electroki-netic analysis to AFM. It turns out that adequate
                      post-deposition treatment is crucial to the for-mation of
                      perfect molecular SAMs. We demonstrate how a thick layer of
                      APTES molecules is initially adsorbed at the surface,
                      however the molecules do not bind to the SiO2 and are
                      removed if the film is exposed to an electrolyte. Only if
                      the film is kept in a gaseous environment (prefera-ble at
                      low pressure) for a long enough time do APTES molecules
                      start to bind to the surface and form the SAM layer. During
                      this time superfluous molecules are removed. The resulting
                      modifi-cation of the electrokinetic potential at the surface
                      is analyzed in detail for the different states.},
      cin          = {ICS-8},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-8-20110106},
      pnm          = {523 - Controlling Configuration-Based Phenomena (POF3-523)},
      pid          = {G:(DE-HGF)POF3-523},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31144819},
      UT           = {WOS:000473248000001},
      doi          = {10.1021/acs.langmuir.8b03832},
      url          = {https://juser.fz-juelich.de/record/863485},
}