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Optimizing functionalization of multiwalled carbon nanotubes using sodium lignosulfonate

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Abstract

Multiwalled carbon nanotubes (MWCNTs) were functionalized with sodium lignosulfonate (SLS) at various SLS/MWCNT ratios, and the solubility of the functionalized MWCNTs was examined using ultraviolet-visible (UV-Vis) spectroscopy. Then, the effects of SLS on the dispersion and conductivity of MWCNTs were investigated. A calibration curve was constructed to measure the concentration of MWCNTs in water using the absorbance measured from UV-Vis spectroscopy. Using the curve, the change in the functionalized MWCNT concentration was investigated as a function of time. The results showed that the solubility of the MWCNTs did not increase significantly with further increases in SLS after the appropriate amount of SLS was employed. Excessive use of SLS rather decreased the conductivity of functionalized MWNTs. Also, the solubility of MWCNTs was influenced by dispersing method even when the same amount of SLS was used. Our method could functionalize the MWCNTs with a small amount of SLS, and the solution could remain stable for lengthy periods of time.

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Acknowledgments

This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

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Authors and Affiliations

  1. Department of Organic Materials and Fiber Engineering, Soongsil University, Seoul, 156-743, South Korea

    Youngjin Jeong & Junsuk Kim

  2. Korea Electrotechnology Research Institute, Changwon, 641-120, South Korea

    Geon-Woong Lee

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  1. Youngjin Jeong
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  2. Junsuk Kim
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  3. Geon-Woong Lee
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Correspondence to Youngjin Jeong.

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Jeong, Y., Kim, J. & Lee, GW. Optimizing functionalization of multiwalled carbon nanotubes using sodium lignosulfonate. Colloid Polym Sci 288, 1–6 (2010). https://doi.org/10.1007/s00396-009-2127-8

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  • DOI: https://doi.org/10.1007/s00396-009-2127-8

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