Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Symposium: Size-Selected Clusters at Surfaces III
O 69.4: Talk
Thursday, February 28, 2008, 14:45–15:00, MA 042
Electrospray Ion Beam Deposition of Nonvolatile Molecules and Nanoparticles in High- and Ultrahigh Vacuum — •Stephan Rauschenbach, Thomas Weitz, Alicia Forment, Jens Boettcher, Giovanni Costantini, Nicola Malinowski, and Klaus Kern — Max-Planck-Institute for Solid State Research, Stuttgart, Germany
Electrospray Ionization is a soft ionization technique with which nonvolatile molecules or nanoparticles from a solution can be transferred into the gas phase. Based on this technique we developed a novel vacuum deposition apparatus, which is capable to transfer these ions into high- or ultrahigh vacuum, mass select them and deposited them on a surface [S.Rauschenbach et. al., Small 4 (2006)]. Destruction free deposition (soft landing) can be achieved, since the kinetic energy of the ions can be controlled. An UHV-STM/AFM is connected to the system for in-situ analysis.
The capability to deposit the large organic molecules, clusters and nanoparticles is demonstrated with a variety of systems. Soft landing of molecules is proven by fluorescence spectroscopy and TOF-SIMS identification of deposited dye molecules. Au-nanoparticles (5 - 20 nm) and carbon nanotubes deposited from ion beams were found intact on the surface identified by atomic force microscopy (AFM). CdS nanorods (30 nm diameter) and V2O5 nanowires (5 nm diameter) observed in AFM after deposition are identified by TOF-SIMS. Estimations of the charge state and the mass-to-charge-ratio show that the nanoparticle ion beams mainly consist of very highly charged particles.