Spectroscopic Investigation of Modified Single Wall Carbon Nanotube (SWCNT)

Abstract

We have investigated the effects of chemical treatment on Single Wall Carbon Nanotube (SWCNT) before and after being modified with HNO 3 /H 2 SO 4 by Raman, FTIR and UV-Vis-NIR spectroscopy. The results show successful carboxylation of the CNT sidewalls as observed from FTIR and UV-Vis-NIR spectroscopy. This successful functionalization is achieved in 6-8 hrs of refluxing. We also report changes in the first and second order Raman spectra of SWNTs functionalized with oxygenated groups. During the experiment, we observe some important Raman features: Radial breathing mode (RBM), Tangential mode (G-band), and Disordered mode (D-band); which are affected due to the chemical oxidation of carbon nanotubes. We found that the ratio of D-to the G-band intensity (I d /I g ), increase after functionalization and the RBM mode in acid treated SWCNTs is almost disappeared.

Comparative study of carbon nanotubes and granular activated carbon: Physicochemical properties and adsorption capacities

“…Absorption spectroscopies are used for the determination of the purity of the sample. Infra-red spectroscopy specifically reveals the nature of functional groups attached to the CNTs and also their modifications due to any kind of treatment (Hussain et al, 2011). Raman spectroscopy is one of the most powerful and easiest tools for characterization and also is a nondestructive technique.…”

“…Raman spectroscopy is one of the most powerful and easiest tools for characterization and also is a nondestructive technique. Raman is used to determine the structure of the CNTs and can also explain the defects caused by acid treatment and the surface functional groups attached at these defective sites (Hussain et al, 2011). To determine the purity and degree of change of CNTs with any chemical or physical treatment, a thermal gravimetric analyzer (TGA) or derivative thermal gravimetric (DTG) device are best suited tools.…”

Synthesis, pharmacokinetics, and biological use of lysine-modified single-walled carbon nanotubes

“…8,38,39 Confirmation, through application of SWCNT functionalization, was accomplished by attaching chelating agent p-SCN-Bn-DOTA through amine-isothiocyanate bonds to the SWCNT-Lys-NH 2 amine handles. The chelator was then radiolabeled with 111 In as a tracer (Figure 4).…”

Fractal analysis - a surrogate technique for material characterization

“…The sample is mixed with an acidic solution containing nitric acid and sulfuric acid (99.9 %, Sigma-Aldrich) in the ratio 3:1 and ultrasonicated using Scientech SE-366 for 20 minutes. Then the mixture is filtered through a Whatman 41 filter paper, washed four times with distilled water, quenched with ice-cooled water followed by addition of sodium hydroxide for basic neutralization [16]. The resulting mixture is then filtered again using a Whatman 42 filter paper after washing four times with distilled water.…”