Abstract
In this work, we have studied the radial breathing mode (RBM) resonance
Raman spectra of single-wall carbon nanotube serpentines. Each
serpentine consists of a series of straight, parallel, and regularly
spaced segments, connected by alternating U-turns formed on top of
crystalline miscut quartz. We compare our omega(RBM) and E(ii) values
with the results in the literature and find a strong environmental
effect related to the tube substrate interaction. We establish experimentally the omega(RBM) = (227/d(t)) root 1 + (0.082 +/-
0.009)d(t)(2) relation between RBM frequency (omega(RBM)) and tube
diameter (d(t)), with a 100 +/- 30 meV downshift in the optical
transition energies with respect to the E(ii) values measured for the
standard ``supergrowth'' samples. (c) 2010 WILEY-VCH Verlag GmbH &
Co. KGaA, Weinheim
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