Application of principal component analysis to discriminate the Raman spectra of functionalized multiwalled carbon nanotubes

Abstract

Raman spectra of starting (pristine) and functionalized multiwalled carbon nanotubes (MWNTs) were analyzed by principal component analysis (PCA) because the original Raman spectra showed very little differences between them. The nanotubes were functionalized with amines: dodecylamine (MWNT1), nonylamine (MWNT2), phenylamine (MWNT3) and octadecylamine (MWNT4), and with dithiols: 1,4-butane dithiol (MWNT5), 1,6-hexane dithiol (MWNT6) and 1,8-octane dithiol (MWNT7). The D and G band intensity ratios (∼1338 and ∼1575 cm −1 ) of the functionalized MWNTs spectra were compared with those of the starting material. For the studied systems, PCA allowed the differentiation between starting and functionalized MWNTs. The present study demonstrated the potential of the application of PCA to the study of functionalized nanotubes by Raman spectroscopy.

Characterization of Iron age pottery from eastern Turkey by laser- induced breakdown spectroscopy (LIBS)

“…In this work we apply PCA directly on the LIB spectral data, which carry, in a combined way, both the compositional and matrix information of each sample and seek to correlate spectral variability with clay variability. This approach is being increasingly employed for processing analytical spectroscopic data (Uy and O'Neil, 2005;Castanys et al, 2006;Sato-Berru et al, 2006 ) and recently was used with considerable success in the treatment of LIBS data obtained from analysis of rock minerals (Sirven et al, 2006a,b).…”

Surface-Enhanced Raman Spectroscopy Characterization of Pristine and Functionalized Carbon Nanotubes and Graphene

“…Although a more efficient discrimination can be reached by applying the principal component analysis [30], the observation of Raman spectral changes induced by the chemical functionalization is challenging.…”

Synthesis of a hybrid assembly composed of titanium dioxide nanoparticles and thin multi-walled carbon nanotubes using “click chemistry”

“…1B shows Raman spectra of pure t-MWCNTs and the t-MWCNT-TiO 2 nanohybrid. Two characteristic bands are seen at 1585 cm À1 (G band) and 1352 cm À1 (D band) in pure tMWCNTs and the nanohybrid [22]. The D band corresponds to defect sites in the hexagonal framework of t-MWCNTs due to disorder induced by sp 3 hybridization, whereas the G band indicates the presence of ordered sp 2 hybridization [23].…”