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O: Fachverband Oberflächenphysik

O 4: Nanostructures at Surfaces

O 4.2: Talk

Monday, February 25, 2008, 11:30–11:45, MA 042

Mid infrared microspectroscopy: Characterization od diamond-like (DL) and polymer-like (PL) single nanoparticle — •Jean-Sébastien Samson¹, Raphaella Weiss², Erik Bründermann¹, Jörg Winter², and Martina Havenith¹ — ¹Physical Chemistry 2, Ruhr-University Bochum, Bochum, Germany — ²Experimental Physics 1, Ruhr-University Bochum, Bochum, Germany

We report on the infrared spectroscopic characterization of plasma nanoparticles formed in a dusty plasma by scanning near-field infrared microscopy (SNIM). We use high power OPO-lasers with up to 2,7 W output power as radiation source [1] which emit in the so-called fingerprint region (2,5-4 um). We were able to use the characteristic N-H absorption band around 3300 cm-1 to spectrally resolve a shift of the band between the diamond-like and the polymer-like phase. The measurement were carried out on a sample containing 100 nm diamond-like and 400 nm polymer-like plasma nanoparticles. Our results demonstrate the high sensitivity of SNIM for characterization of nanoparticles found in plasma. [1]J.-S. Samson et al. PCCP, (2006), 8, 753-758