Molecularly imprinted polyaniline film for ascorbic acid detection

Authors

  • Abani Kumar Roy,

    1. Department of Science & Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Marg, New Delhi 110012, India
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  • Nisha V. S,

    1. Department of Science & Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Marg, New Delhi 110012, India
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  • Chetna Dhand,

    1. Department of Science & Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Marg, New Delhi 110012, India
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  • Bansi D. Malhotra

    Corresponding author
    1. Department of Science & Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Marg, New Delhi 110012, India
    • Department of Science & Technology Centre on Biomolecular Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K.S. Krishnan Marg, New Delhi 110012, India.
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Abstract

Molecularly imprinted polyaniline (PANI) film (∼100 nm thick) has been electrochemically fabricated onto indium–tin–oxide (ITO) coated glass plate using ascorbic acid (AA) as template molecule. Fourier transform infra-red spectroscopy, scanning electron microscopy, cyclic voltammetry and differential pulse voltammetry (DPV) studies indicate the presence of AA in PANI matrix, which also acts as a dopant for PANI. Further, the AA selective molecularly imprinted PANI electrode (AA-MI-PANI/ITO) has been developed via over-oxidation of AA doped PANI electrode which leads to the removal of AA moieties from PANI film. The response studies using DPV technique have revealed that this molecularly imprinted AA-MI-PANI/ITO electrode can detect AA in the range of 0.05–0.4 mM with detection limit of 0.018 mM and sensitivity of 1.2 × 10−5 AmM−1. Interestingly, this AA-MI-PANI/ITO electrode shows excellent reusability, selectivity and stability. Copyright © 2011 John Wiley & Sons, Ltd.

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