Nano Research

, Volume 9, Issue 9, pp 2715–2728 | Cite as

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

  • Paul Finnie
Research Article


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.


single walled carbon nanotube (SWCNT) tunable Raman spectroscopy purity metallicity 


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© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Security and Disruptive Technologies PortfolioNational Research Council CanadaOttawaCanada

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