Resonant Raman scattering characterization of carbon nanotubes grown with different catalysts

Pore structure and oxidation stability of double-walled carbon nanotube-derived bucky paper

“…In our DWNTs, the rather sharp G + peak at 1592 cm -1 , the G -shoulder peak at 1570 cm -1 (corresponding to semiconducting tubes), and the low intensity of the asymmetric Raman features located at ca. 1550cm -1 (corresponding to metallic tubes) [22] are indicative that suggests a larger concentration of semi-conducting tubes.…”

A step toward production of smaller diameter single wall carbon nanotubes

“…The Raman intensity has one maximum at 158.2 cm -1 and the overall structure is shifted toward lower frequencies as compared to the previously described spectra. The position of the Raman RBMs do not allow to define directly the distribution of diameters in the SWCNTs samples, but probe just a sub-set of nanotubes which are in resonance either with the incident or the scattered photon, as pointed out earlier 16 . However, it can give a scaling of mean diameter when the several SWCNTs samples are homogenous.…”

“…It should be noticed that there is an alternative proce-dure to obtain the mean diameter using Raman scattering, as proposed by Corio et al 16 , relating the diameter distribution to the tangential modes. This kind of procedure cannot be used here, because it applies to metallic nanotubes, in resonance with the lowest electronic transition energy (E 11 ).…”

Characterization of the chemical interaction between single-walled carbon nanotubes and titanium dioxide nanoparticles by thermogravimetric analyses and resonance Raman spectroscopy

“…3 for TiO 2 are typical spectra of anatase [1,27], and the four bands at 142, 394, 514, and 638 cm -1 confirm that this is the major form. These bands are attributed to E g , The 514.5-nm excitation is in resonance with semiconducting nanotubes, the 632.8-nm excitation is in resonance with metallic nanotubes, and the excitation of 785 nm is in resonance with both types of nanotubes (considering the diameter distribution of the present SWNT sample) [13,28,29]. The main difference among these different types of SWNTs is in the G band.…”