Switchable Surfaces

In this collaborative project, performed within the SFB 677 in cooperation with the group of Prof. Herges (Institute of Organic Chemistry, CAU), externally controllable nanoscale systems are designed by attaching novel photoswitchable molecules to metal surfaces. We aim at employing these functional adsorbate layers as molecular motors, for example for the directed transport of nanoparticles. To mount the switchable molecular units, typically azobenzene derivatives, in precisely controlled orientation and with defined spacing onto the surface we have developed the platform concept, which employs the triazatriangulenium (TATA) ion as a pedestal. We analyze the structure and photoswitching behavior of the TATA adlayers by scanning tunneling and scanning force microscopy, various spectroscopic methods (e. g., gap-mode SERS and surface plasmon resonance spectroscopy), as well as by photoelectrochemical experiments.

 

id32-cell.jpg 3d-atoms.jpg

 

 

Contact: Dr. Ulrich Jung

Funding: SFB 677 “Function by Switching” (project B2)

 

Selected publications:

 

  • Triazatriangulenium adlayers on Au(111): Superstructure as a function of alkyl side chain length, S
    Lemke, S. Ulrich, F. Claußen, A. Bloedorn, U. Jung, Rainer Herges, O.M. Magnussen, Surf. Sci., 632, 71-76 (2015)
  • Ordered Monolayers of Free Standing Porphyrins on Gold
    F.L. Otte, S. Lemke, C. Schütt, N.R. Krekiehn, U. Jung, O.M. Magnussen, R. Herges, J. Am. Chem. Soc. (Communication), 136, 11248-11251 (2014)
  • Studies of the molecular switching of azobenzene-functionalized platform adlayers on Au(111) by chronoamperometry
    U. Jung, J. Kubitschke, R. Herges, O.M. Magnussen, Electrochim. Acta, 112, 869-880 (2013)
  • Localized surface plasmon resonance investigations of photoswitching in azobenzene-functionalized self-assembled monolayers on Au
    M. Müller, U. Jung, V. Gusak, S. Ulrich, M. Holz, R. Herges, C. Langhammer, O.M. Magnussen, Langmuir, 29, 10693-10699 (2013)
  • Pointed carbon fiber ultramicroelectrodes: A new probe for electrochemical scanning tunneling microscopy
    J. Sripirom, S. Kuhn, U. Jung, O.M. Magnussen, A. Schulte, Anal. Chem., 85, 837-842 (2013)
  • Photoswitching of azobenzene-functionalized molecular platforms on Au
    U. Jung, C. Schüll, O. Filinova, J. Kubitschke, R. Herges, O.M. Magnussen, J. Phys. Chem. C, 116, 25943-25948 (2012)
  • Adlayers based on molecular platforms of trioxatriangulenium
    S. Kuhn, U. Jung, S. Ulrich, R. Herges, O.M. Magnussen, Chem. Comm., 47, 8880-8882 (2011)
  • Azobenzene-containing triazatriangulenium adlayers on Au(111): Structural and spectroscopic characterization
    U. Jung, S. Kuhn, U. Cornelissen, F. Tuczek, T. Strunskus, V. Zaporojtschenko, J. Kubitschke, R. Herges, O.M. Magnussen, Langmuir, 27, 5899-5908 (2011)
  • Photoswitching behavior of azobenzene-containing alkanethiol self-assembled monolayers on Au surfaces
    U. Jung, O. Filinova , S. Kuhn, D. Zargarani, C. Bornholdt, R. Herges, O.M. Magnussen, Langmuir, 26, 13913-13923 (2010)
  • Self-assembly of triazatriangulenium-based functional adlayers on Au(111) surfaces
    S. Kuhn, B. Baisch, U. Jung, T. Johannsen, J. Kubitschke, R. Herges, O.M. Magnussen, Phys. Chem. Chem. Phys., 12, 4481-4487 (2010)
  • Self-assembly of triazatriangulenium-based functional adlayers on Au(111) surfaces
    S. Kuhn, B. Baisch, U. Jung, T. Johannsen, J. Kubitschke, R. Herges, O.M. Magnussen, PCCP, in press (2010).
  • Gap-mode SERS studies of azobenzene-containing self-assembled monolayers on Au(111)
    U. Jung, M. Müller, N. Fujimoto, K. Ikeda, K. Uosaki, U. Cornelissen, F. Tuczek, C. Bornholdt, D. Zargarani, R. Herges, O.M. Magnussen, J. Coll. Interf. Sci. 341, 366-375 (2010).
  • Mounting freestanding molecular functions onto surfaces: the platform approach
    B. Baisch, D. Raffa, U. Jung, O.M. Magnussen, C. Nicolas, J. Lacour, J. Kubitschke, R. Herges, J. Am. Chem. Soc., 131, 442-443 (2009).
  • Structure and redox behavior of azobenzene-containing monolayers on Au(111): A combined STM, x-ray reflectivity, and voltammetry study
    U. Jung, B. Baisch, D. Kaminski, K. Krug, A. Elsen, T. Weineisen, D. Raffa, J. Stettner, C. Bornholdt, R. Herges, O.M. Magnussen, J. Electroanal. Chem. 619, 152-158 (2008).