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Issue 4, 2014
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Polypyrrole nanotubes: mechanism of formation

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This article presents a contribution to better understanding of the processes which take place during the synthesis of polypyrrole nanotubes using a structure-guiding agent, methyl orange. Polypyrrole was prepared by oxidation of pyrrole monomer with iron(III) chloride. In the presence of methyl orange, the formation of nanotubes was observed instead of the globular morphology. Two reaction schemes with reversed additions of oxidant and monomer have been tested and they show remarkable influence on the produced morphology. Nanotubes with circular or rectangular profiles and diameters from tens to hundreds of nanometres have been obtained. FTIR and Raman spectra were used to assess the molecular structure of polypyrrole and detect residual methyl orange in the samples. The conductivity of nanotubes compressed into pellets was as high as 68 S cm−1. The mechanism of nanotubular formation starting at the nucleus produced with the participation of organic dye is proposed. The growth of a nanotube, however, proceeds in the absence of a template. An alternative mechanism for the formation of nanotubes, the coating of solid templates with a polypyrrole overlayer, is also discussed.

Graphical abstract: Polypyrrole nanotubes: mechanism of formation

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Publication details

The article was received on 15 Oct 2013, accepted on 14 Nov 2013 and first published on 14 Nov 2013

Article type: Paper
DOI: 10.1039/C3RA45841E
RSC Adv., 2014,4, 1551-1558

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    Polypyrrole nanotubes: mechanism of formation

    J. Kopecká, D. Kopecký, M. Vrňata, P. Fitl, J. Stejskal, M. Trchová, P. Bober, Z. Morávková, J. Prokeš and I. Sapurina, RSC Adv., 2014, 4, 1551
    DOI: 10.1039/C3RA45841E

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