Lattice Dynamics of Potassium-Doped Single-Walled Carbon Nanotubes
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Abstract
We calculate the vibrational properties of potassium-doped single-walled carbon nanotubes within lattice dynamical theory. The results show that the frequency of high-frequency Raman mode E2g for K5C40 downshifts to 1553 cm-1, which is in agreement with the value for highly doped samples with effective composition KC8. Moreover, the specific heat curves have a turnover at 22 K, originating from the saturation of K atoms vibrational modes at low energy.
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