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- W2172938908 abstract "Raman spectroscopy is a technique widely used to study the vibrational modes of carbon nanotubes. The low-frequency Radial Breathing Modes (RBMs) are frequently used to characterize carbon nanotube samples. We report a Raman spectroscopic study on the strain-induced intensity variations of the RBMs of Single-Wall Carbon Nanotubes (SWNTs) in epoxy/SWNT composites. The RBM intensities vary significantly over a range of strain between -0.3% and 0.7%. The trend (increase or decrease) as well as the magnitudes of the intensity variation depends on the nanotube diam. and its chirality. Using tight-binding calcns., we have shown that these intensity variations can be explained entirely by resonance theory. Electronic d. of states calcns. confirm that the energy sepn. between the Van Hove singularities shifts with strain. The nanotubes are thus moved closer or further away from resonance, causing the intensity variations. It is demonstrated that through the use of resonance theory, a tentative chirality can be assigned to each type of SWNT from knowledge of its RBM position and the effect of strain upon the RBM intensity, thus detg. its entire structure. [on SciFinder (R)]" @default.
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- W2172938908 date "2004-01-01" @default.
- W2172938908 modified "2023-09-27" @default.
- W2172938908 title "Deformation behavior of the Raman Radial Breathing Modes of single-wall carbon nanotubes in composites." @default.
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