Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.29: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Mapping Purity of Single-walled Carbon Nanotubes in Bulk Samples with Multiplex Coherent Anti-Stokes Raman Microscopy — Alex S. Duarte^1,2, Jean Rehbinder¹, Ricardo R.B. Correia², •Tiago Buckup¹, and Marcus Motzkus¹ — ¹Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany — ²Physics Institute, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil

Single-walled carbon nanotubes (SWNT) have been extensively investigated due their unique electrical and structural properties. SWNT are also very attractive for industrial applications due catalytic features and functionalization potential. There are several synthesis methods of carbon nanotubes but all of them produce a certain amount of impurity. In this regard, a technique of local purity characterization in bulk samples of SWNT is desired. Mapping of defects in a distribution of SWNT is performed via multiplex coherent anti-Stokes Raman spectroscopy (MCARS). The D- over G-band ratio in the SWNTs vibrational spectrum is acquired simultaneously and used to quantify the local purity in a spin-coated sample. The mapping of purity is performed using the ratio D/G. We observe that induced defects by spontaneous oxidation are related to the spatial dispersion of nanotubes in a solid distribution.