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Polyacrylic Acid/Polyaniline-Coated Multimode Interferometer for Ammonia Detection.

Ning Wang1, Chao Zhao1, Gang Long1

  • 1National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, China.

Materials (Basel, Switzerland)
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

A novel coaxial optical fiber interferometer (COFI) coated with polyacrylic acid/polyaniline composite film demonstrates high sensitivity for ammonia sensing. This advanced sensor offers rapid response and recovery times for effective ammonia leak detection.

Keywords:
ammonia sensorcoaxial optical fiber interferometer (COFI)polyacrylic acidpolyaniline

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Ammonia gas detection is crucial for industrial safety and environmental monitoring.
  • Optical fiber sensors offer advantages like remote sensing and immunity to electromagnetic interference.
  • Developing sensitive and selective ammonia sensors remains an active research area.

Purpose of the Study:

  • To propose and demonstrate a coaxial optical fiber interferometer (COFI) for ammonia sensing.
  • To investigate the sensing performance of a polyacrylic acid (PAA)/polyaniline (PAni) composite film.
  • To optimize the PAA/PAni composite ratio for enhanced ammonia detection.

Main Methods:

  • Fabrication of a COFI using single-mode fibers (SMF) and no-core fiber (NCF).
  • Coating the COFI with a PAA/PAni composite film.
  • Characterization of the composite film using SEM and FTIR spectroscopy.
  • Testing the sensor's response to varying ammonia concentrations at room temperature.

Main Results:

  • The PAA/PAni composite film exhibited superior ammonia sensing performance compared to single-component films.
  • Optimal performance was achieved with a composite film containing 5 wt% PAA and 2 wt% PAni.
  • A maximum sensitivity of 9.8 pm/ppm was recorded at 50 ppm ammonia concentration.
  • The sensor demonstrated a response time of 100 s and a recovery time of 180 s with good stability and selectivity.

Conclusions:

  • The developed optical fiber ammonia sensor based on a PAA/PAni composite COFI is effective for ammonia detection.
  • The sensor exhibits high sensitivity, rapid response, and good stability, making it suitable for industrial applications.
  • This technology can be applied for monitoring ammonia leakage during production, storage, transportation, and usage.