Coating of multiwalled carbon nanotubes with polymer nanospheres through microemulsion polymerization |
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Authors: | Kakarla Raghava Reddy Byung Cheol Sin Chi Ho Yoo Daewon Sohn Youngil Lee |
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Affiliation: | aDepartment of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea;bResearch and Development Department, Ulsan Fine Chemical Industry Center, Ulsan 681-340, Republic of Korea;cDepartment of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea |
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Abstract: | We report a simple and noncovalent method for coating multiwalled carbon nanotubes (MWCNTs) with polyaniline (PANI) nanospheres using a microemulsion polymerization method. In this method, aniline polymerization is performed with MWCNTs in the presence of sodium dodecyl sulfate (SDS), which serves as both a surfactant and a dopant. Morphological, structural, thermal, and electrical properties of MWCNT–PANI nanocomposites were analyzed. The TEM results of the nanocomposites prepared with surfactant reveal that 30–50-nm-diameter PANI nanospheres were coated on the surface of the MWCNTs. Composites prepared without surfactant were found to be in core–sheath-type cable structures. The conductivities of the nanocomposites synthesized through microemulsion polymerization were found to be one order of magnitude higher than both the conductivities of pure PANI and the composites prepared via in situ chemical polymerization without an assisting SDS surfactant. The mechanism for the formation of nanostructured composites is presented. |
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Keywords: | Microemulsion polymerization Conjugated polymer Carbon nanotubes Nanocomposites Morphology Electrical conductivity |
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