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DS: Fachverband Dünne Schichten

DS 3: Organic Thin Films

DS 3.11: Vortrag

Montag, 16. März 2015, 18:15–18:30, H 2032

High-speed confocal Raman imaging of carbon nanotubes — •Michael Ludemann, Susanne Hartmann, Anne-D. Müller, and Falk Müller — Anfatec Instruments AG, Melanchthonstr. 28, D-08606 Oelsnitz (V)

Raman spectroscopy is a powerful tool in terms of chemical analysis and determination of physical properties. The ability of scanning the sample during a measurement provides an insight into these properties in a spatially resolved way by converting spectral features into color code images.

Due to a huge number of image points, Raman mapping is seriously affected by long acquisition times. A new Raman spectrometer is designed for excellent coupling to an atomic force microscope (AFM) with the focus of maximized light throughput. Here, the optimum compromise for a sufficiently high signal-to-noise ratio is achieved at 8 ms exposure time per pixel resulting in an image acquisition time of less than 3 minutes, even with a non-cooled CCD. Based on this development, high-speed Raman mapping measurements on carbon nanotube (CNT) bundles on a silver/glass substrate are presented.

Raman mapping of single CNTs enables to distinguish between different types of CNTs. The spatial distribution of the CNT bundles and hot spot induced surface enhanced Raman spectroscopy (SERS) will be presented, as well.