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Solid-contact pH-selective electrode using multi-walled carbon nanotubes.

Gastón A Crespo1, Derese Gugsa, Santiago Macho

  • 1Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, 43007 Tarragona, Spain.

Analytical and Bioanalytical Chemistry
|September 18, 2009
PubMed
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Multi-walled carbon nanotubes (MWCNT) enable a novel solid-contact pH electrode. This new sensor offers fast, selective, and Nernstian pH measurements, advancing electrochemical sensing technology.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Carbon nanotubes are effective in converting ionic to electronic signals.
  • Solid-contact electrodes offer advantages over traditional designs.
  • Developing robust and selective pH sensors is crucial for various applications.

Purpose of the Study:

  • To develop a novel solid-contact pH-selective electrode utilizing multi-walled carbon nanotubes (MWCNT).
  • To characterize the potentiometric performance, response time, and selectivity of the developed electrode.
  • To investigate the electrochemical behavior and stability of the MWCNT-based electrode.

Main Methods:

  • Fabrication of a solid-contact pH electrode with a MWCNT layer between an ion-selective membrane and a glassy carbon conductor.

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  • Preparation of the ion-selective membrane using specific ionophores, lipophilic additives, and polymer matrices.
  • Potentiometric measurements to evaluate Nernstian behavior, dynamic range, and response time.
  • Electrochemical impedance spectroscopy and chronopotentiometry for electrochemical characterization and stability assessment.

    • Main Results:

    • The MWCNT layer efficiently transduced ionic-to-electronic current for pH sensing.
    • The electrode exhibited Nernstian potentiometric response within a linear dynamic range of 2.89 to 9.90 pH.
    • A rapid response time of less than 10 seconds was achieved across the working range.
    • The electrode demonstrated high selectivity against common interfering ions.

    Conclusions:

    • Multi-walled carbon nanotubes are suitable for creating efficient solid-contact pH-selective electrodes.
    • The developed electrode offers a promising alternative for rapid, selective, and stable pH monitoring.
    • This work contributes to the advancement of electrochemical sensor technology.