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Tailoring polythiophene cation-selective optodes for wide pH range sensing.

Emilia Stelmach1, Brian Kaczmarczyk1, Krzysztof Maksymiuk1

  • 1Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland.

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Summary

New polyoctylthiophene-based nanoptodes overcome pH sensitivity challenges for reliable sensing of potassium and calcium ions across a wide pH range. These advanced sensors maintain high sensitivity in both acidic and alkaline conditions.

Keywords:
OptodesPolyoctylthiopheneRedox sensitivitypH sensitivity

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Optode sensors often suffer from pH sensitivity, limiting their application in diverse chemical environments.
  • Traditional optodes using pH-sensitive dyes are unsuitable for broad pH range sensing.
  • Polyoctylthiophene-based optodes offer a pH-independent response mechanism.

Purpose of the Study:

  • To develop and characterize novel nanoptodes based on polyoctylthiophene for sensitive detection of K+ and Ca2+ ions.
  • To demonstrate the applicability of these nanoptodes in both acidic and alkaline pH ranges.
  • To investigate and mitigate the influence of solution redox potential and pH on sensor performance.

Main Methods:

  • Fabrication of polyoctylthiophene-based nanoptodes.
  • Testing sensor response to K+ and Ca2+ in a wide pH range (acidic to alkaline).
  • Investigating the effect of solution redox potential and oxygen on sensor sensitivity.
  • Modifying optode composition with hydrogen binding compounds to enhance pH stability.

Main Results:

  • The developed nanoptodes exhibit a 6-orders-of-magnitude linear response to K+ and Ca2+ concentrations in turn-on mode.
  • Sensor performance showed some dependence on pH and oxygen, attributed to redox potential changes affecting the polyoctylthiophene oxidation state.
  • Tailoring optode composition with hydrogen binding compounds effectively minimized pH-induced sensitivity variations.
  • High sensitivity for analyte cations was maintained across acidic (pH 4) and alkaline (pH 9.2) media.

Conclusions:

  • Polyoctylthiophene-based nanoptodes provide a robust platform for sensing K+ and Ca2+ ions, overcoming the limitations of pH sensitivity.
  • The developed sensors are suitable for applications in both acidic and alkaline environments.
  • Modification strategies can further enhance the stability and reliability of polyoctylthiophene optodes across varying solution conditions.