Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: New Materials
CPP 43.4: Vortrag
Freitag, 27. März 2009, 11:15–11:30, ZEU 114
Intercalated fullerene polymers and Raman spectroscopy - Vibrations and more? — •Markus Reinmöller1, Thomas Wågberg2, and Bertil Sundqvist2 — 1Ilmenau University of Technology, Institute for Physics, Department of Chemistry, Ilmenau, Germany — 2Umeå University, Institute for Physics, Department of Nanophysics and Material Science, Umeå, Sweden
We have synthesised very homogeneous samples from two-dimensional intercalated fullerene polymers in the chemical compositions of Li4C60 and Na4C60. On both samples we performed Raman measurements with a He-Ne-laser from 300 K to 480 K.
In the temperature studies we analysed the temperature dependence of selected Raman active modes. The results can be compared to values from several other fullerene polymers [1]. A qualitative evaluation of the heat transport properties can be accomplished by a variation of the laser light intensity. From our analysis we deduced the temperature dependence of characteristic modes and explain differences between the materials by the unequal bonding types [2].
In our Raman studies of Li4C60 at elevated temperatures we find two different regimes. From the transition of these regions the initiation of depolymerisation can be estimated.
Raman spectroscopy is a powerful tool and we show that it can be used in an indirect and maybe uncommon way to learn more about materials.
[1] A. V. Talyzin et al., Sol. State Comm., 140 (2006) 178.
[2] S. Margadonna et al., J. Am. Chem. Soc., 126 (2004) 15032.