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Chirality Characterization of Dispersed Single Wall Carbon NanotubesRaman scattering and optical absorption spectroscopy are used for the chirality characterization of HiPco single wall carbon nanotubes (SWNTs) dispersed in aqueous solution with the surfactant sodium dodecylbenzene sulfonate. Radial breathing mode (RBM) Raman peaks for semiconducting and metallic SWNTs are identified by directly comparing the Raman spectra with the Kataura plot. The SWNT diameters are calculated from these resonant peak positions. Next, a list of (n, m) pairs, yielding the SWNT diameters within a few percent of that obtained from each resonant peak position, is established. The interband transition energies for the list of SWNT (n, m) pairs are calculated based on the tight binding energy expression for each list of the (n, m) pairs, and the pairs yielding the closest values to the corresponding experimental optical absorption peaks are selected. The results reveal that (1, 11), (4, 11), and (0, 11) as the most probable chiralities of the semiconducting nanotubes. The results also reveal that (4, 16), (6, 12) and (8, 8) are the most probable chiralities for the metallic nanotubes. Directly relating the Raman scattering data to the optical absorption spectra, the present method is considered the simplest technique currently available. Another advantage of this technique is the use of the E(sup 8)(sub 11) peaks in the optical absorption spectrum in the analysis to enhance the accuracy in the results.
Document ID
20050160169
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Namkung, Min
(NASA Langley Research Center Hampton, VA, United States)
Williams, Phillip A.
(National Academy of Sciences - National Research Council Hampton, VA, United States)
Mayweather, Candis D.
(Spelman Coll. Atlanta, GA, United States)
Wincheski, Buzz
(NASA Langley Research Center Hampton, VA, United States)
Park, Cheol
(National Inst. of Aerospace Hampton, VA, United States)
Namkung, Juock S.
(Naval Air Warfare Center Patuxent River, MD, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2005
Subject Category
Mechanical Engineering
Meeting Information
Meeting: 2005 MRS Spring Meeting
Location: San Francisco, CA
Country: United States
Start Date: March 28, 2005
End Date: April 1, 2005
Sponsors: Materials Research Society
Funding Number(s)
OTHER: 23-064-50-10
Distribution Limits
Public
Copyright
Public Use Permitted.
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