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Simultaneous Multiselective Spectroelectrochemical Fiber-Optic Sensor: Sensing with an Optically Transparent

Takuya Okazaki1, Eri Shiokawa1, Tatsuya Orii1

  • 1Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama , 3190 Gofuku, Toyama 930-8555, Japan.

Analytical Chemistry
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Summary

We developed a novel spectroelectrochemical fiber-optic sensor using an optically transparent indium tin oxide (ITO) electrode. This cost-effective, disposable sensor offers enhanced selectivity for analyte detection through electrochemical methods.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Optoelectronics

Background:

  • Fiber-optic sensors offer remote and sensitive detection capabilities.
  • Optically transparent electrodes are crucial for combined optical and electrochemical measurements.
  • Indium tin oxide (ITO) is a widely used transparent conductive material.

Purpose of the Study:

  • To develop a novel spectroelectrochemical fiber-optic sensor.
  • To investigate the use of an optically transparent indium tin oxide (ITO) electrode for sensing.
  • To enhance sensor selectivity using self-assembled monolayers.

Main Methods:

  • Fabrication of ITO-coated fiber-optic probes using polygonal barrel-sputtering.
  • Characterization of ITO-coated probes with varying thicknesses.
  • Spectroelectrochemical measurements based on attenuated total reflection (ATR).
  • Immobilization of self-assembled monolayers (polyanion/polycation) for enhanced selectivity.

Main Results:

  • Successful fabrication of disposable, mass-producible ITO-coated fiber-optic probes.
  • Demonstration of sensing based on ATR signal changes during electrochemical redox reactions.
  • Optimization of ITO thickness for effective electrode performance.
  • Enhanced sensor selectivity achieved through electrostatic adsorption of self-assembled monolayers.

Conclusions:

  • The developed spectroelectrochemical fiber-optic sensor with an ITO electrode is a cost-effective and disposable sensing platform.
  • The sensor effectively utilizes ATR signals coupled with electrochemical detection.
  • Self-assembled monolayers significantly improve sensor selectivity, paving the way for advanced analyte detection.