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Quantitative analysis of dispersion and doping of individual carbon nanotubes in water based solutions using absorption and Raman spectroscopy
Author(s) -
Priya B. R.,
Byrne H. J.
Publication year - 2008
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.200879562
Subject(s) - raman spectroscopy , carbon nanotube , protonation , analytical chemistry (journal) , dispersion (optics) , absorption (acoustics) , doping , absorption spectroscopy , spectroscopy , pulmonary surfactant , chemistry , materials science , nanotechnology , optics , physics , chromatography , organic chemistry , ion , optoelectronics , biochemistry , quantum mechanics , composite material
The concentration dependence of the dispersion of carbon nanotubes in water surfactant solution is monitored using absorption and Raman spectroscopy revealing a debundling below ∼0.07 g/l. A quantitative analysis of the doping of individual carbon nanotubes in surfactant at this concentration is conducted by varying the pH from 1 to 13 and monitoring the Raman spectrum. Mixed Gaussian and Lorentzian line shapes were fitted to the radial breathing modes and using a simple protonation model, an equilibrium constant K p was obtained for each RBM. The protonation rate was related to the optical band gap of the tubes and the number of protons acting per entity was also calculated. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)