Dresden 2009 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 38: Nanostructured Materials II

MM 38.2: Talk

Thursday, March 26, 2009, 10:30–10:45, IFW B

Quantitative composition of a single-walled carbon nanotube sample: Raman scattering vs. Photoluminescence — •Sebastian Heeg, Cinzia Casiraghi, and Stephanie Reich — Freie Universität Berlin, Berlin, Deutschland

The growth processes of Carbon Nanotubes (CNTs) yield samples containing tubes with a large variety of different chiralities. The qualitative composition of the CNTs product has been revealed by Raman scattering [1] and by Photoluminescence Emission (PLE) measurements [2]. The quantitative composition, however, remains a task in CNT characterization. We adress this problem by comparing the relative PLE intensities of two families of nanotubes with the relative intensities of the according Radial Breathing Modes obtained by Raman scattering. The PLE measurements were performed by dissolving the HiPCO grown nanotubes in aqueous solution using sodium dodecylbenzene sulfonate as surfactant. Raman Spectroscopy was performed by depositing the tubes from the solution on a silicon substrate by spin-coating. The presence of the CNTs was confirmed by atomic force microscopy. We show that the two methods yield significantly different ratios and we compare the results with theoretical predictions.

[1] J. Maultsch et al. Radial breathing mode of single-walled carbon nanotubes: Optical transition energies and chiral index assignment. Phys. Rev B, 72:205438, 2005.
S.M. Bachilo et al. Structure-assigned optical spectra of single-walled carbon nanotubes.Science, 298:2361, 2002.