Volume 131, Issue 24
Article

Design of a nanostructured electromagnetic polyaniline–keggin iron–clay composite modified electrochemical sensor for the nanomolar detection of ascorbic acid

Reena Viswan Lilly

Reena Viswan Lilly

National Institute of Interdisciplinary Science and Technology, Thiruvananthapuram, 695019 India

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Sudha Janardhanan Devaki

Corresponding Author

Sudha Janardhanan Devaki

National Institute of Interdisciplinary Science and Technology, Thiruvananthapuram, 695019 India

Correspondence to: S. J. Devaki (E-mail: [email protected])Search for more papers by this author
Rohini Kuttiplavil Narayanan

Rohini Kuttiplavil Narayanan

National Institute of Interdisciplinary Science and Technology, Thiruvananthapuram, 695019 India

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Neethu Kalloor Sadanandhan

Neethu Kalloor Sadanandhan

National Institute of Interdisciplinary Science and Technology, Thiruvananthapuram, 695019 India

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First published: 27 May 2014
Citations: 11

ABSTRACT

This article demonstrates the design and fabrication of an electrochemical sensor based on a platinum electrode for ascorbic acid (AA) modified by an electromagnetic polyaniline–Keggin iron–clay (PPICS) composite. The polyaniline–polyhydroxy iron–clay composite was prepared by the polymerization of [Anilinium]+[PDPSA] in the presence of Keggin iron intercalated clay and was characterized for its particle size, morphology, electrical conductivity, and saturation magnetization. The oxidation potential of AA was observed at +0.4 V on the bare electrode and shifted to a negative potential of −0.32 V on the modified electrode. Common possible interferences of the sample matrices were tested, and the results reveal that the PPICS-modified electrode exhibited a high selectivity and sensitivity toward AA. This unique low-cost and user-friendly sensor was validated for the nanomolar detection of AA present in real samples. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40936.

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