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Ch Loppacher

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Articles by Ch Loppacher

Physical vapour deposition of alkyl phosphonic acid on mica and HOPG investigated by NC-AFM

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By Technische Universität Dresden, D. A. Koehler, Ch Loppacher, U. Zerweck
| tu-dresden.de
We investigate the growth of octadecylphosphonic acid (OPA) self-assembly molecules prepared by physical vapour deposition (PVD) on mica and highly oriented pyrolytic graphite (HOPG) under ultrahigh-vacuum conditions. On samples prepared by immersion from diluted solution on mica self-assembled monolayers are formed, whereas by PVD and subsequent annealing we observe the formation of almost perfect self-assembled bilayers slightly tilted with respect to the surface normal.
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Quantitative and nanoscale surface potential tracking of ionic and organic adsorbates at sub-monolayer coverage

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By L. Eng, Professur für Experimentalphysik, Ch Loppacher, Technische Universität Dresden
| tu-dresden.de
We use an improved setup for deducing quantitative surface potential values by means of frequency modulated Kelvin-probe force microscopy (FM-KPFM). This method is sensitive to the electrostatic force gradient rather than the absolute force probed in KPFM so far, and therefore provides both a higher lateral resolution and quantitative values. Furthermore, FM-KPFM allows using cantilevers with high spring constants which even favors both the stability and increased topographic resolution.
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Near-field spectroscopy with white-light illumination

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By J. A. Seidel, TUD Dresden, Ch Loppacher, S. Grafström
| tu-dresden.de
We report on near-field optical spectroscopy based on the illumination of the sample with white light from a Xe arc lamp through a tapered optical fiber. The light transmitted through the sample is analyzed with a grating spectrometer in the spectral range between 400 and 750 nm. Our setup provides a unique possibility for recording detailed spectroscopic information within a short acquisition time.
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