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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Highly sensitive and fast responsive fiber-optic modal interferometric pH sensor based on polyelectrolyte complex and

Mingjie Yin1, Bobo Gu, Qiang Zhao

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China.

Analytical and Bioanalytical Chemistry
|February 15, 2011
PubMed
Summary

This study introduces a novel fiber-optic pH sensor using layer-by-layer assembly of polyelectrolyte complex nanoparticles on a thin-core fiber modal interferometer. The sensor demonstrates high sensitivity and rapid response for accurate pH monitoring.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Optoelectronics

Background:

  • Fiber-optic sensors offer non-intrusive and remote sensing capabilities.
  • Accurate and rapid pH monitoring is crucial in various scientific and industrial applications.
  • Existing pH sensors may face limitations in sensitivity, response time, or durability.

Purpose of the Study:

  • To develop a novel fiber-optic pH sensor with enhanced sensitivity and rapid response time.
  • To utilize layer-by-layer (LbL) electrostatic self-assembly for fabricating the sensor.
  • To investigate the relationship between nanocoating properties and sensor performance.

Main Methods:

  • Fabrication of a thin-core fiber modal interferometer (TCFMI).
  • Coating the TCFMI with polyelectrolyte complex (PEC(-)) nanoparticles and poly(diallyldimethylammonium chloride) (PDDA) using LbL electrostatic self-assembly.
  • Characterization of the sensor's response to different pH values using transmission dip wavelength shifts.
  • Analysis of nanocoating properties using quartz crystal microbalance and atomic force microscopy (AFM).

Main Results:

  • The TCFMI pH sensor exhibited distinct transmission dip wavelengths at varying pH levels.
  • High sensitivities of 0.6 nm/pH unit (acidic) and -0.85 nm/pH unit (alkaline) were achieved.
  • Short response times of 30-50 seconds were observed.
  • AFM revealed increased surface roughness with PEC(-) nanoparticles, correlating with improved sensor performance.
  • The sensor demonstrated high reversibility and good durability.

Conclusions:

  • The developed LbL-assembled TCFMI pH sensor offers a promising solution for sensitive and rapid pH detection.
  • The enhanced surface roughness and thickness of the nanocoating are key factors for improved sensor performance.
  • The sensor's reversible and durable nature makes it suitable for practical applications.