Comparative study of carbon nanotube dispersion using surfactants

Rastogi, Richa and Kaushal, Rahul and Tripathi, S.K. and Sharma, A.L. and Kaur, Inderpreet and Bharadwaj, L.M. (2008) Comparative study of carbon nanotube dispersion using surfactants. Journal of Colloid and Interface Science, 328 (2). pp. 421-428. ISSN 0021-9797

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Dispersion of carbon nanotubes (CNTs) is a challenging task for their utilization in nanoscale device applications. This account reports a comparative analysis on dispersion of multiwalled carbon nanotubes (MWNTs) with four surfactants-Triton X-100, Tween 20, Tween 80, and sodium dodecyl sulfate (SDS). Among the four surfactants, Triton X-100 and SDS provide maximum and minimum dispersion, respectively. Dispersion of MWNTs has been characterized with UV-vis spectroscopy and transmission electron microscopy (TEM). TEM results are in agreement with the UV-vis measurements. The experimentally observed trend of dispersing power of surfactants is consistent with their chemical structures. An optimum CNT-to-surfactant ratio has been determined for each surfactant. This parameter is shown to affect the nanotube dispersion significantly. Surfactant concentration above or below this ratio is shown to deteriorate the quality of nanotube dispersion. TEM analysis of a high-surfactant-concentration sample enables us to construct a plausible mechanism for decrease in CNT dispersion at high surfactant concentration, consistent with the UV-vis observations. Temperature stability of the surfactant is another important factor affecting the quality of CNT dispersion

Item Type: Article
Uncontrolled Keywords: Dispersion; Absorbance; Multiwalled nanotubes; Surfactants
Subjects: CSIO > Nano Science and Nano Technology
Divisions: Nano Science and Nano Technology
Depositing User: Ms T Kaur
Date Deposited: 02 Feb 2012 14:47
Last Modified: 10 Apr 2012 15:15

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