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Isotope-induced elastic scattering of optical phonons in individual suspended single-walled carbon nanotubes
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Image of FIG. 1.
FIG. 1.

(Color online) (a) Cross-sectional SEM image of the patterned substrate before SWNT synthesis and (b) plan view after synthesis. SWNTs were found suspended across the trenches, as indicated by the arrows. (c) Normalized G-band spectra from suspended SWNTs synthesized using 13C concentrations of 0% (β = 0) to 100% (β = 1) in 10% increments.

Image of FIG. 2.
FIG. 2.

(Color online) Resonance Raman spectra (488 nm excitation) from four suspended semiconducting SWNTs with 13C concentrations β of (a) 0.2, (b) 0.4, (c) 0.6, and (d) 0.9. Each G-band was fitted using two Lorentzian lineshapes. Measured data, lineshapes, and fitted curves are shown by open circles, dashed lines and solid lines, respectively. γ is the FWHM of the G+ peak, and the inset shows the lone RBM feature observed in each spectrum.

Image of FIG. 3.
FIG. 3.

(Color online) Average FWHM values of the G (open circles) and G+ (solid squares) Raman peaks in suspended SWNTs as a function of 13C concentration. Solid curves are fits of the data using Eq. (1) with and for G, and and for G+ (see text). The inset is a histogram of G+ FWHM statistics for the case β = 0.5 showing the symbols indicate statistical average and the bars indicate standard deviation.


Generic image for table
Table I.

Summary of resonance Raman spectral data obtained for isotope-mixed SWNTs, including the number of single-RBM spectra obtained for each 13C concentration (β) and the average FWHM values (γ) of the RBM, G, and G+ features. The excitation laser wavelength was 488 nm.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Isotope-induced elastic scattering of optical phonons in individual suspended single-walled carbon nanotubes