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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Bipolar electrochemiluminescence (BE-ECL) shows analytical promise but faces limitations in high-throughput applications due to high operating voltages and mobility constraints.
  • Existing nano/microscale bipolar electrode designs require high voltages, hindering practical, high-throughput analytical methods.
  • There is a need for advanced BE-ECL systems that operate at lower voltages and facilitate rapid, sensitive detection.

Purpose of the Study:

  • To engineer a dynamic BE-ECL platform that overcomes voltage and mobility limitations for high-throughput applications.
  • To investigate the electrochemical mechanisms and field intensification effects in a novel micropore-confined BE-ECL system.
  • To demonstrate the platform's capability for sensitive and rapid quantification of biomarkers, such as human chorionic gonadotropin (HCG).

Main Methods:

  • Development of a dynamic BE-ECL platform utilizing structurally optimized 10 mL centrifuge tubes as micropore-confined devices.
  • Employing functionalized SiO2/CNT microbeads (SCBs) for gravity-driven translocation through an embedded micropore, generating spatiotemporally resolved ECL emission.
  • Utilizing finite element simulations and experimental validation to analyze field intensification and ECL mechanisms in the [Ru(bpy)3]2+/TPrA system.

Main Results:

  • Achieved significant reduction in operational voltages through synergistic field intensification from geometric confinement-polarization coupling.
  • Observed distinct anodic ECL mechanisms: direct oxidation at overpotential and coreactant-mediated excitation at threshold potential.
  • Demonstrated fg/mL-level quantification of HCG using functionalized SCB biosensors with spatiotemporally resolved flow-through detection at reduced voltages.

Conclusions:

  • The engineered dynamic BE-ECL platform effectively reduces operational voltages and enhances analytical performance.
  • The platform enables high-throughput suspension array biosensing with high sensitivity and spatiotemporal resolution.
  • This work establishes the practical viability of the developed BE-ECL system for sensitive biomarker quantification and other high-throughput analytical applications.