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Voltammetry on microfluidic chip platforms

Wang1, Polsky, Tian

  • 1Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces 88003, USA.

Analytical Chemistry
|November 18, 2000
PubMed
Summary

Microfluidic chips enable sensitive electrochemical analysis by integrating voltammetry with on-chip fluid control. This approach achieves high sensitivity for detecting compounds like TNT and trace metals, offering advantages over traditional methods.

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Area of Science:

  • Electrochemistry
  • Microfluidics
  • Analytical Chemistry

Background:

  • Microfluidic chip devices offer promising platforms for microscale voltammetric analysis.
  • Integrating voltammetric procedures with on-chip chemical reactions and fluid manipulations is key for advanced analytical systems.

Purpose of the Study:

  • To assess the impact of experimental variables, particularly high voltage for electroosmotic flow, on microfluidic chip voltammetry.
  • To demonstrate the integration of chemical reactions with on-chip voltammetric detection.
  • To evaluate the performance of microfluidic voltammetry for sensitive analyte detection.

Main Methods:

  • Recorded linear-sweep, square-wave, and adsorptive-stripping voltammograms using electrokinetic pumping in microchannels.
  • Manipulated electroosmotic flow for hydrodynamic modulation (stopped-flow) and reversed-flow operations.

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  • Utilized rapid square-wave voltammetry/flow injection for trace analysis and integrated chemical reactions for specific analyte detection.

    • Main Results:

    • Demonstrated that the potential window of the chip detector is dependent on the driving voltage.
    • Achieved a detection limit of 2 pmol for 2,4,6-trinitrotoluene (TNT) using square-wave voltammetry/flow injection.
    • Successfully integrated chemical reactions for adsorptive stripping measurements of trace nickel.

    Conclusions:

    • Microfluidic chip voltammetry allows for effective compensation of background currents and extended residence times.
    • On-chip voltammetric protocols offer advantages over nanovial operations lacking liquid-handling capabilities.
    • The integration of microfluidic chips with voltammetry presents significant opportunities for future analytical applications.