Simultaneous Use Of Dopant Combination During Synthesis Of Polyaniline: An Approach Towards Synergistic Improvement In Different Properties | 42348
Journal of Material Sciences & Engineering
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Polyaniline (PAni) is one of the most widely explored intrinsically conducting polymers which is conducting in nature in its
partially doped form. The present investigation reveals the synergistic effect of simultaneous use of dopant combinations during
synthesis of PAni on its different properties. Individually and dual doped PAni were synthesized via electrochemical and solid state
route. Electrochemical synthesis was carried out in polar protic (aqueous) as well as aprotic (dimethyl formamide) solvent using
sulfuric acid (H2SO4) and p-tuluenesulfonic acid (PTSA) as dopants. Solvent-free solid state synthesis of PAni involved the dopants
citric acid monohydrate (CA) and camphorsulfonic acid (CSA). For all cases total dopant concentration was maintained at 1M and
relative proportion of the dopant concentrations was varied at 1:3, 2:2 and 3:1. Simultaneously dual doped PAni exhibited synergistic
improvement in electrical conductivity for all cases. Dopant ratios of [H2SO4]:[PTSA]=3:1 and [CA]:[CSA]=3:1 resulted in highest
extent of synergy for respective synthesis processes. Dopant combination of H2SO4 and PTSA in protic and aprotic polar medium of
synthesis exhibited maximum improvement of conductivity by 1.5 and 2.6 fold increase. However, the combination of CA and CSA
in solid state synthesis exhibited a maximum of 8 fold increase of conductivity compared to individually doped samples which is even
higher in comparison with 4% (w/w) addition of multiwalled carbon nanotube in CA doped PAni. Synergistic improvement was also
observed for different dual doped PAni in supercapacitive behaviour as well as thermal degradation characteristics within certain
range of temperature.
Subhendu Bhandari has completed his PhD from Indian Institute of Technology Kharagpur, India. At present, he is an Assistant Professor in Plastics and Polymer Engineering Department, Maharashtra Institute of Technology, Aurangabad. He has published 9 papers in reputed journals and filed 1 patent.