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Optical absorption spectrum of single-walled carbon nanotubes dispersed in sodium cholate and sodium dodecyl sulfate

Published online by Cambridge University Press:  31 January 2011

Inderpreet Singh ,
P.K. Bhatnagar ,
P.C. Mathur  and
L.M. Bharadwaj
Inderpreet Singh*
Affiliation:
Materials Laboratory, Department of Electronic Science, University of Delhi—South Campus, New Delhi 110 021, India
P.K. Bhatnagar
Affiliation:
Materials Laboratory, Department of Electronic Science, University of Delhi—South Campus, New Delhi 110 021, India
P.C. Mathur
Affiliation:
Materials Laboratory, Department of Electronic Science, University of Delhi—South Campus, New Delhi 110 021, India
L.M. Bharadwaj
Affiliation:
Central Scientific Instruments Organization, Sector 30, Chandigarh 160 020, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Commercially procured single-walled carbon nanotubes were dispersed in 2 wt% solution of sodium cholate and also in 1 wt% solution of sodium dodecyl sulfate. The absorption spectrum of the suspensions was studied in ultraviolet–visible–near-infrared (UV–vis–NIR) range. Two distinct bands, each containing three peaks, were observed in NIR range for both the suspensions. These peaks correspond to transitions between van Hove singularities E11 and E22 in the density of states of the semiconducting nanotubes. Comparing positions of the observed peaks with the empirical Kataura plot, the diameters and chiralities of the nanotubes were estimated. Using tight binding approximations, the diameter of the nanotubes was also estimated theoretically. Discrepancies between the theoretically calculated diameters and those obtained by empirical Kataura plots are found to be higher for E11 peaks. It has been suggested that the reason for this discrepancy is that the observed E11 peaks are blue-shifted due to Coulomb interactions and exciton formation.

Keywords

AbsorptionInfrared (IR) spectroscopySemiconducting
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 3 , March 2008 , pp. 632 - 636
Copyright
Copyright © Materials Research Society 2008

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