The role of acidity profile in the nanotubular growth of polyaniline |
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Authors: | Elena N Konyushenko Miroslava Trchová Jaroslav Stejskal Irina Sapurina |
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Institution: | (1) University School of Basic and Applied Sciences, GGS Indraprastha University, Kashmere Gate, Delhi, 110403, India;(2) University School of Chemical Technology, GGS Indraprastha University, Kashmere Gate, Delhi, 110403, India; |
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Abstract: | Conditions of polyaniline (PANI) nanotubes preparation were analyzed. Aniline was oxidized with ammonium peroxydisulfate in
0.4 M acetic acid. There are two subsequent oxidation steps and the products were collected after each of them. At pH > 3,
neutral aniline molecules are oxidized to non-conducting aniline oligomers. These produce templates for the subsequent growth
of PANI nanotubes, which takes place preferably at pH 2–3. At pH < 2, granular morphology of the conducting PANI is obtained.
High final acidity of the medium should be avoided in the preparation of nanotubes, e.g., by reducing the amount of sulfuric
acid which is a by-product. Reduction of the peroxydisulfate-to-aniline mole ratio was tested for this purpose in the present
study. Lowering of the reaction temperature from 20°C to −4°C had a positive effect on the formation of nanotubes. |
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