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The role of acidity profile in the nanotubular growth of polyaniline
Konyushenko, Elena N., Trchová, Miroslava, Stejskal, Jaroslav and Sapurina, Irina The role of acidity profile in the nanotubular growth of polyaniline Chemical Papers, Vol.64, No. 1, 2010, 56-64
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Author(s) |
Konyushenko, Elena N.
Trchová, Miroslava
Stejskal, Jaroslav
Sapurina, Irina
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| Title |
The role of acidity profile in the nanotubular growth of polyaniline
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| Journal name |
Chemical Papers
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| Publication date |
2010
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| Year available |
2010
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| Volume number |
64
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| Issue number |
1
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| ISSN |
0366-6352
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| Start page |
56
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| End page |
64
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2010
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| Language |
english
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| Subject |
250000 Chemical Sciences
250500 Macromolecular Chemistry
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| Abstract/Summary |
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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