Grafting of polyaniline onto the surface of 4‐aminobenzoyl‐functionalized multiwalled carbon nanotube and its electrochemical properties |
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Authors: | In‐Yup Jeon Sang‐Wook Kang Loon‐Seng Tan Jong‐Beom Baek |
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Affiliation: | 1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), 100, Banyeon, Ulsan 689‐897, South Korea;2. Nanostructured and Biological Materials Branch, Materials and Manufacturing Directorate, U.S. Air Force Research Laboratory, AFRL/RXBN, Wright‐Patterson AFB, Ohio 45433 |
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Abstract: | Polyaniline (PANi)‐grafted multiwalled carbon nanotube (MWNT) composite is prepared by a two‐step reaction sequence. MWNT is first functionalized with 4‐aminobenzoic acid in polyphosphoric acid/phosphorous pentoxide as a “direct” Friedel‐Crafts acylation reaction medium. The resultant 4‐aminobenzoyl‐functionalized MWNT is then treated with aniline using ammonium persulfate/aqueous hydrochloric acid to promote a chemical oxidative polymerization, leading to PANi‐grafted MWNT composite. The resultant composite is characterized by elemental analysis, Fourier‐transform infrared spectroscopy, wide‐angle X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, UV–vis absorption spectroscopy, fluorescence spectroscopy, cyclic voltammetry, and electrical conductivity measurement. The thermooxidative stability and electrical conductivity of PANi‐grafted MWNT composite are improved compared to those of PANi. Specifically, the electrical conductivity of PANi‐grafted MWNT is improved 10–900 times depending upon the level of doping. The capacitance of the composite is also greatly enhanced. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 3103–3112, 2010 |
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Keywords: | electrochemistry high‐performance polymers multiwalled carbon nanotube nanocomposites polyaniline polyphosphoric acid |
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