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http://dx.doi.org/10.3795/KSME-A.2007.31.4.483

The Quantitative Characterization of the Dispersion State of Single-Walled Carbon Nanotubes  

Yoon, Do-Kyung (성균관대학교 나노과학기술학부)
Choi, Jae-Boong (성균관대학교 기계공학부)
Kim, Young-Jin (성균관대학교 나노과학기술학부, 기계공학부)
Baik, Seung-Hyun (성균관대학교 기계공학부, 나노과학기술학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.4, 2007 , pp. 483-489 More about this Journal
Abstract
We have investigated quantitative measurement techniques of the degree of dispersion of single-walled carbon nanotubes (SWNTs). SWNTs were suspended in aqueous media using a sodium dodecyl sulfate (SDS) surfactant. SWNTs with different dispersion states were prepared by controlling the intensity and time of sonication and centrifugation. The laser spectroscopic techniques were employed to characterize the dispersion state; i.e., raman fluorescence and absorption spectroscopic techniques. Raman spectroscopy has been used to probe the dispersion and aggregation state of SWNTs in solution. Individually suspended SWNTs show increased fluorescence peaks and decreased roping peaks at a raman shift 267 $cm^{-1}$ compared with the samples containing bundles of SWNTs. The ultraviolet-visible-near infrared (UV-vis-NIR) absorption spectrum of decanted supernatant samples show sharp van Hove singularity peaks
Keywords
Dispersion; Single-Walled Carbon Nanotube; Fluorescence; Raman Spectroscopy; Absorption Spectroscopy;
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