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A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core-Shell-Type Spherical Polyaniline Particles.

Masanobu Matsuguchi¹, Tomoki Nakamae¹, Ryoya Fujisada¹

¹Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 3, Ehime, Matsuyama 790-8577, Japan.

Sensors (Basel, Switzerland)

|November 27, 2021

Summary

Highly sensitive ammonia (NH3) gas sensors were developed using micrometer-sized polyaniline (PANI) spheres. The PANI microsphere sensors demonstrated significantly enhanced performance at room temperature.

Keywords:

NH3 gas sensor core–shell structure microspheres polyaniline

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Ammonia (NH3) gas detection is crucial for environmental monitoring and industrial safety.
Developing highly sensitive and room-temperature operating gas sensors remains a challenge.

Purpose of the Study:

To fabricate and characterize a highly sensitive NH3 gas sensor using micrometer-sized polyaniline (PANI) spheres.
To investigate the effect of microsphere size on sensor performance.

Main Methods:

Polyaniline (PANI) microspheres with a core-shell structure were synthesized via in situ chemical oxidation polymerization.
Polystyrene microspheres were used as templates to control PANI particle size.
Sensor performance was evaluated by measuring the response to different concentrations of NH3 gas at room temperature.

Main Results:

The sensor response to NH3 gas increased with increasing microsphere diameter.
The PSt@PANI(4.5) sensor, with 4.5 μm microspheres, exhibited the highest response (77 for 100 ppm NH3) at 30 °C.
This performance was 20 times greater than PANI film-based sensors, with a detection limit as low as 46 ppb.

Conclusions:

Micrometer-sized PANI spherical particles are key to achieving high NH3 gas sensor sensitivity.
This study presents a simple and effective method for developing room-temperature, high-sensitivity NH3 gas sensors.