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Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions

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Abstract

The thiocyanate (SCN−) level in human saliva, serum, and blood has been considered as a biomarker for analyzing the practice of cigarette smokers. Here, we have developed a highly sensitive and selective electrochemical sensor for SCN− in phosphate buffer using an Ag@Cu bimetallic nanorods (NRDs) modified glassy carbon electrode (GCE). The bimetallic Ag@Cu NRDs were grown on the GCE surface by a simple seed-mediated growth method. Initially, Ag seeds were deposited on the Nafion coated GCE. The deposited Agseeds in turn accelerate the growth of bimetallic Ag@Cu NRDs in the presence of cetyltrimethyl ammonium bromide, which acts as a soft template for the one-dimensional growth of NRDs. The synthesised NRDs were characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy measurements. The Ag@Cu NRDs modified electrode shows an excellent response towards the electrochemical oxidation of SCN−. Cyclic voltammetry was used to study the linear correlation of SCN− oxidation between 1 and 10 mM, and, subsequently, 10 nM was achieved as the detection limit with a signal to noise ratio (S/N = 3) for Ag@Cu bimetallic NRDs modified GCE. This unique sensor shows a high selectivity towards trace amounts of SCN− in the presence of various interfering cations and anions. It satisfactorily recognized the generated SCN− in a real-time application such as in human saliva. Finally, the fingerprint of SCN− existence in the saliva samples of cigarette smokers and non-smokers were differentiated in a short span of time with ease.

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Acknowledgments

Financial support from the DST-SERB, New Delhi (File No. SR/FT/CS-44/2011 dated 04.05.2012) and Karunya University, Coimbatore are gratefully acknowledged.

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  1. Department of Chemistry, Karunya University, Coimbatore, 641114, India

    Jeena Susan Easow, Periyasami Gnanaprakasam & Thangavelu Selvaraju

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  1. Jeena Susan Easow
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  2. Periyasami Gnanaprakasam
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  3. Thangavelu Selvaraju
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Correspondence to Thangavelu Selvaraju.

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Easow, J.S., Gnanaprakasam, P. & Selvaraju, T. Synergistic effect of bimetallic Ag@Cu nanorods modified electrode for enhanced electrochemical sensing of thiocyanate ions. Res Chem Intermed 42, 2539–2551 (2016). https://doi.org/10.1007/s11164-015-2166-3

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