Polyaniline-based composite on GCE used for trimethyl, dimethyl and methyl amines through CV. In the case of TMA and MA the peak height was increased with increasing concentration, whereas DMA showed the peak height or current decreased with increasing concentration and ammonia did not show any peak in CV for all concentrations.
concentration range was 0.1 to 0.5 ug/g in Fe2+/3+CN system. Why do TMA and DMA behave differently?
For a good answer, please rewrite your question and give more infos about polyaniline based composite (structure and purity) and about your cyclic voltammetry apparatus (supplier).
How do you introduce the amines as gas in your C.V. apparatuss. Infos needed!
Please see the structure of methyl, dimethyl and trimethylamine and the pKb values in your chemistry book. TMA has a different structure towards MA and DMA and is less basic than MA and DMA.
For C.V the amines used as gas must be pure too.
methylamine is a gas like dimethylamine and trimethylamine and they are dangerous (fume hood)
At this time it is not possible to answer your last question without the above infos
another link:
http://onlinelibrary.wiley.com/doi/10.1002/14356007.a16_535/abstract;jsessionid=AF51E3916478B6001891C7757447E7CE.f01t02
JRG
Dear Grezes. I wish to clarify that PANi synthesised using Analar grade chemicals. I have used Autolab PGstat 30 with FRA2 instrument. We have used aqueous amines with varying concentrations and made up with 1:1 Pot Ferro ferry cyanide electrolyte. We have given some explanation based pka and pkb in the published paper .
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