A polyaniline-containing filter paper that acts as a sensor, acid, base, and endpoint indicator and also filters acids and bases

In this paper we report a new idea for synthesizing polyaniline in an ordinary filter paper. The synthesis was carried out by a process in which aqueous acidic aniline solution and the oxidizing agent H 2O 2 was added to the paper drop by drop and in sequence. Uniform polymerization could be obtaine...

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Bibliographic Details
Published in:Journal of colloid and interface science 2005-03, Vol.283 (1), p.153-159
Main Authors: Dutta, Dipak, Sarma, Tridib Kumar, Chowdhury, Devasish, Chattopadhyay, Arun
Format: Article
Language:English
Subjects:
Chemistry
Conducting polyaniline
Exact sciences and technology
Filter paper
General and physical chemistry
Materials
Polymerization
Sensor
Spectroscopic methods
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Summary:In this paper we report a new idea for synthesizing polyaniline in an ordinary filter paper. The synthesis was carried out by a process in which aqueous acidic aniline solution and the oxidizing agent H 2O 2 was added to the paper drop by drop and in sequence. Uniform polymerization could be obtained with the addition of reagents in either sequence. The polymer formation led to a green coloration of the paper. Formation of the emeraldine salt of polyaniline was confirmed by UV–vis and FTIR spectroscopy. Scanning electron microscopic measurements were made for surface characterization of the polymer formed in the paper. The same paper was used as a sensor for ammonia in vapor and in solution, for acid and base as well as endpoint indication, and also to filter acids and bases. We found that, using the polymer-containing paper, ammonia concentrations in a solution as low as 14 ppm could be measured.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2004.08.051