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Highly sensitive ammonia sensor based on a PMMA/PANI microwire structure.

Cai-Hong Cheng, Bo Han, Liangliang Cheng

|March 4, 2024

Summary

A new ammonia sensor uses a PMMA/PANI microwire for high sensitivity and selectivity. This sensor offers improved integration and durability, addressing common issues in gas sensing technology.

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Area of Science:

Materials Science
Chemical Sensing
Optical Physics

Background:

Developing highly sensitive and selective gas sensors is crucial for environmental monitoring and industrial safety.
Existing ammonia sensors often face challenges with film adhesion and integration.

Purpose of the Study:

To design and implement a novel, highly sensitive ammonia sensor using a polymethyl methacrylate/polyaniline (PMMA/PANI) microwire structure.
To enhance sensor performance by leveraging Mach-Zehnder interference and the properties of PMMA/PANI composites.

Main Methods:

Fabrication of a micron-sized PMMA microwire coupled with tapered single-mode fibers to excite Mach-Zehnder interference.
Incorporation of polyaniline (PANI) into the PMMA microwire to create a PMMA/PANI fiber sensitive to ammonia.
Characterization of the sensor's refractive index sensitivity and selective ammonia detection capabilities.

Main Results:

The PMMA microwire coupling structure demonstrated a high refractive index sensitivity of 3044 nm/RIU.
The PMMA/PANI fiber exhibited selective ammonia sensing with a high sensitivity of 65.3 pm/ppm.
The sensor design effectively prevented sensitive film shedding, ensuring durability.

Conclusions:

The developed PMMA/PANI microwire sensor offers a robust and highly sensitive solution for ammonia detection.
The sensor integrates well, shows good selectivity, and has a fast response time.
This technology presents a significant advancement in optical gas sensing applications.