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Raman spectra of metallic carbon nanotubes in solution and on substrates
Author(s) -
Hatting Benjamin,
Heeg Sebastian,
Reich Stephanie
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201300376
Subject(s) - raman spectroscopy , carbon nanotube , materials science , metal , substrate (aquarium) , spectral line , fermi level , aqueous solution , optical properties of carbon nanotubes , electrochemistry , analytical chemistry (journal) , raman scattering , nanotube , nanotechnology , chemistry , electrode , optics , metallurgy , physics , electron , astronomy , oceanography , quantum mechanics , chromatography , geology
We present the Raman spectra of metallic carbon nanotubes in solution and deposited onto a Si/SiO 2 substrate. In the different nanotube samples, we observe qualitatively similar behavior: an upshifted and narrowed metallic LO peak in solution compared to the spectrum on the substrate. This behavior is due to the Fermi energy shifting away from the intrinsic value in the solutions, which we confirm by in situ electrochemical Raman measurements. Our results have implications for all spectroscopic methods that probe nanotubes in aqueous solutions. Raman spectra of metallic nanotubes in solution (orange) and on a Si/SiO 2 substrate (black). The inset depicts the position of the Fermi energy in both situations.