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Simple, Robust, and Plasticizer-Free Iodide-Selective Sensor Based on Copolymerized Triazole-Based Ionic Liquid

Mendecki, Lukasz; Chen, Xiaorui; Callan, Nicole; Thompson, David F.; Schazmann, Benjamin; Granados-Focil, Sergio; Radu, Aleksandar

Simple, Robust, and Plasticizer-Free Iodide-Selective Sensor Based on Copolymerized Triazole-Based Ionic Liquid Thumbnail


Authors

Lukasz Mendecki

Xiaorui Chen

Nicole Callan

Benjamin Schazmann

Sergio Granados-Focil

Aleksandar Radu



Abstract

Novel solid-contact iodide-selective electrodes based on covalently attached 1,2,3 triazole ionic liquid (IL) were prepared and investigated in this study. Triazole-based IL moieties were synthesized using click chemistry and were further copolymerized with lauryl methacrylate via a simple one-step free radical polymerization to produce a "self-plasticized" copolymer. The mechanical properties of the copolymer are suitable for the fabrication of plasticizer-free ion-selective membrane electrodes. We demonstrate that covalently attached IL moieties provide adequate functionality to the ion-selective membrane, thus achieving a very simple, one-component sensing membrane. We also demonstrate that the presence of iodide as the counterion in the triazole moiety has direct influence on the membrane's functionality. Potentiometric experiments revealed that each electrode displays high selectivity toward iodide anions over a number of inorganic anions. Moreover, the inherent presence of the iodide in the membrane reduces the need for conditioning. The nonconditioned electrodes show strikingly similar response characteristics compared to the conditioned ones. The electrodes exhibited a near Nernstian behavior with a slope of -56.1 mV per decade across a large concentration range with lower detection limits found at approximately 6.3 × 10(-8) M or 8 ppb. These all-solid-state sensors were utilized for the selective potentiometric determination of iodide ions in artificial urine samples in the nanomolar concentration range.

Acceptance Date Mar 11, 2016
Publication Date Mar 11, 2016
Journal Analytical Chemistry
Print ISSN 0003-2700
Publisher American Chemical Society
Pages 4311 -4317
DOI https://doi.org/10.1021/acs.analchem.5b04461
Publisher URL http://dx.doi.org/10.1021/acs.analchem.5b04461

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