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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Improving Electrochemical Sensing in Ionic Liquid Droplets via Microscale Stirring.

Xue Xing1,2, Fuyun Yang1,2, Yuying Yang1,2

  • 1Institute of Advanced Synthesis (IAS), and School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Centre for Advanced Materials, Nanjing Tech University, Nanjing 211816, China.

ACS Applied Materials & Interfaces
|November 26, 2025
PubMed
Summary

Microstirbars significantly improve ionic-liquid-based electrochemical gas sensor performance by overcoming slow mass transfer. This simple method enhances sensor sensitivity and response time, offering a viable alternative to complex designs.

Keywords:
ElectrochemistryGas sensorIonic liquidMicrostirbarOxygen

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Ionic liquids (ILs) are promising electrolytes for electrochemical gas sensors.
  • High IL viscosity hinders mass transfer, limiting sensor speed and sensitivity.
  • Current sensor designs often involve complex fabrication processes.

Purpose of the Study:

  • To develop a simple method for enhancing mass transfer in IL-based electrochemical sensors.
  • To investigate the effectiveness of microstirbars in improving sensor performance.
  • To optimize microstirbar parameters for efficient stirring and mass transfer.

Main Methods:

  • Fabrication of tunable-sized microstirbars using wet spinning.
  • Evaluation of stirring efficiency using fluorescent dye dispersion in ILs.
  • Assessment of mass transfer enhancement via chronoamperometry with ferrocene.
  • Application of optimized microstirring to oxygen detection in an electrochemical sensor.

Main Results:

  • Microstirbars achieved homogeneous dye dispersion in ILs 200 times faster than controls.
  • Optimized microstirring (400 rpm, 8.0 wt %, 300 μm) significantly enhanced mass transfer.
  • Oxygen sensor sensitivity increased 6-fold compared to unstirred controls.
  • Response time (T90) for 6.7% O2 improved threefold with microstirring.

Conclusions:

  • Microstirbars provide a straightforward and effective solution for mass transfer limitations in IL-based electrochemical sensors.
  • This microstirring approach offers a viable alternative to complex sensor designs.
  • The microstirring strategy has broad applicability for enhancing mass transfer in microdroplets across various sensing applications.