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Reactive sensing capability towards the working electrical and chemical conditions of poly (aniline –co–o-toluidine) copolymers

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Abstract

Conducting polymers are considered as reactive gels which can sense the working ambient through their unique electrochemical reaction. Copolymers of aniline with o-toluidine for three different monomer compositions were synthesized chemically and were characterized using FTIR and UV-Vis spectroscopy, SEM, TGA, and cyclic voltammetry. The electrochemical reactive sensing characteristics with respect to the electrical and chemical working conditions of the copolymers were verified and compared through Chronopotentiometric responses in aqueous solutions of HCl by changing the reaction variables: applied current and chemical environment (electrolyte concentration) at a fixed constant charge. The consumed electrical energy during the electrochemical reaction of the copolymers varies linearly with the driving current and follows a logarithmic dependence on the electrolyte concentration. The consumed electrical energy during the reaction was found to act as the sensing parameter. At the same experimental condition, the sensitivity was associated with the conductivity of the copolymers. The highly conducting composition gives the highest sensitivity. These experimental results were fitted with the theoretical equation.

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Acknowledgements

The authors gratefully acknowledge Central Sophisticated Instrumentation Facilities (CSIF), University of Calicut, Kerala, India for providing instrumentation facilities for analysis. Lijin Rajan acknowledges Kerala State Council for Science Technology and Environment (KSCSTE), Kerala, India for the financial assistance through the research fellowship. M P Sidheekha acknowledges UGC, India for providing a research fellowship.

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Authors and Affiliations

  1. Advanced Materials Research Center, Department of Chemistry, University of Calicut, Thenhipalam, Kerala, 673635, India

    Lijin Rajan, Madari Palliyalil Sidheekha, Aranhikkundan Shabeeba & Yahya A. Ismail

  2. Department of Chemistry, St.Mary’s College, Sulthan Bathery, Wayanad, Kerala, 673592, India

    Sruthy Chathinmaril Unnikrishnan

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  1. Lijin Rajan
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  2. Madari Palliyalil Sidheekha
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  3. Aranhikkundan Shabeeba
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Correspondence to Yahya A. Ismail.

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Rajan, L., Sidheekha, M.P., Shabeeba, A. et al. Reactive sensing capability towards the working electrical and chemical conditions of poly (aniline –co–o-toluidine) copolymers. Res Chem Intermed 48, 4313–4329 (2022). https://doi.org/10.1007/s11164-022-04814-6

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