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

Lukasz Mendecki1, Xiaorui Chen2, Nicole Callan3

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Novel solid-contact iodide-selective electrodes utilize covalently attached triazole ionic liquid for enhanced performance. These plasticizer-free sensors offer high selectivity and reduced conditioning needs for accurate iodide detection.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Development of ion-selective electrodes (ISEs) is crucial for chemical sensing.
  • Plasticizer use in ISE membranes can lead to leaching and instability.
  • Novel materials are needed for robust and reliable ion-selective membranes.

Purpose of the Study:

  • To develop novel solid-contact iodide-selective electrodes (ISEs).
  • To investigate the performance of ISEs based on covalently attached triazole ionic liquid (IL).
  • To assess the influence of iodide counterions on electrode functionality.

Main Methods:

  • Synthesis of triazole-based IL moieties using click chemistry.
  • Copolymerization of IL moieties with lauryl methacrylate via free radical polymerization.
  • Fabrication of plasticizer-free ion-selective membrane electrodes.
  • Potentiometric measurements for selectivity and detection limit determination.

Main Results:

  • A "self-plasticized" copolymer suitable for plasticizer-free ISEs was produced.
  • Covalently attached IL moieties created a simple, one-component sensing membrane.
  • Electrodes showed high selectivity for iodide over other inorganic anions.
  • Non-conditioned electrodes exhibited performance similar to conditioned ones.
  • Near Nernstian behavior (slope of -56.1 mV/decade) with a low detection limit (~6.3 × 10⁻⁸ M).

Conclusions:

  • Covalently attached triazole ILs are effective for creating functional, plasticizer-free iodide-selective membranes.
  • The presence of iodide as a counterion enhances membrane functionality and reduces conditioning requirements.
  • The developed solid-contact electrodes are suitable for sensitive and selective potentiometric determination of iodide in complex matrices like artificial urine.