Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes
- 163 Downloads
Tunable filter Raman spectroscopy is used to efficiently produce Raman excitation maps of unpurified and type-purified single walled carbon nanotubes (SWCNTs). Maps with fine excitation resolution (1 nm) are created over a wide wavelength range (727 to 980 nm), extending from metallic to semiconducting resonances. At a given wavelength, the wide bandwidth (>3,000 cm–1) allows the comparison of the G band with the radial breathing mode (RBM), and shows the 2D band and other less prominent bands. Materials examined included unsorted powders, aqueous sorted semiconductors, aqueous sorted metals, and polyfluorene sorted semiconductors in toluene. The Raman excitation profiles of the G band are broad, relative to the RBM bands. The maps offer evidence of minority species contamination, except in the case of the polyfluorene sorted semiconductors. Tunable Raman spectroscopy data help validate the simpler fixed wavelength Raman spectroscopy approaches to purity assessment.
Keywordssingle walled carbon nanotube (SWCNT) tunable Raman spectroscopy purity metallicity
Unable to display preview. Download preview PDF.
- Brar, V. W.; Samsonidize, G. G.; Santos, A. P.; Chou, S. G.; Chattopadhyay, D.; Kim, S. N.; Papadimitrakopoulos, F.; Zheng, M.; Jagota, A.; Onoa, G. B. et al. Resonance Raman spectroscopy characterization of single-wall carbon nanotube separation by their metallicity and diameter. J. Nanosci. Nanotechnol. 2005, 5, 209–228.CrossRefGoogle Scholar
- Pesce, P. B. C.; Araujo, P. T.; Nikolaev, P.; Doorn, S. K.; Hata, K.; Saito, R.; Dresselhaus, M. S.; Jorio, A Calibrating the single-wall carbon nanotube resonance Raman intensity by high resolution transmission electron microscopy for a spectroscopy-based diameter distribution determination. Appl. Phys. Lett. 2010, 96, 051910.CrossRefGoogle Scholar
- Ding, J. F.; Li, Z.; Lefebvre, J.; Cheng, F. Y.; Dubey, G.; Zou, S; Finnie, P.; Hrdina, A.; Scoles, L.; Lopinski, G. P. et al. Enrichment of large-diameter semiconducting SWCNTs by polyfluorene extraction for high network density thin film transistors. Nanoscale 2014, 6, 2328–2339.CrossRefGoogle Scholar
- Ding, J. F.; Li, Z.; Lefebvre, J.; Cheng, F. Y.; Dunford, J. L.; Malenfant, P. R. L.; Humes, J.; Kroeger, J. A hybrid enrichment process combining conjugated polymer extraction and silica gel adsorption for high purity semiconducting single-walled carbon nanotubes (SWCNT). Nanoscale 2015, 7, 15741–15747.CrossRefGoogle Scholar