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Related Experiment Video

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Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation

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A miniature chemiresistor sensor for carbon dioxide.

Sira Srinives¹, Tapan Sarkar¹, Raul Hernandez¹

¹Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA.

Analytica Chimica Acta

|April 26, 2015

Summary

A novel polyaniline nanostructure sensor detects carbon dioxide (CO2) at room temperature. This chemiresistor shows high performance and reliability, even with humidity and minimal interference from other gases.

Keywords:

Carbon dioxide Conducting polymer Gas sensor Poly(ethyleneimine)Polyaniline

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Carbon dioxide (CO2) detection is crucial for environmental monitoring and industrial processes.
Developing sensitive and selective gas sensors operating at room temperature remains a challenge.

Purpose of the Study:

To develop a miniature chemiresistor sensor for CO2 detection.
To functionalize a polyaniline (PANI) nanostructure with poly(ethyleneimine) (PEI) for enhanced sensing capabilities.

Main Methods:

Fabrication of a carpet-like PANI nanothin film.
Functionalization of the PANI nanostructure with PEI.
Testing the PEI-PANI device's response to varying CO2 concentrations (50-5000 ppm) at room temperature.
Evaluating sensor performance in the presence of humidity and interfering gases (ammonia, CO, methane, nitrogen dioxide).

Main Results:

The PEI-PANI sensor demonstrated good CO2 sensing performance at room temperature.
The sensor exhibited negligible interference from ammonia, carbon monoxide, methane, and nitrogen dioxide.
The sensing mechanism involves an acid-base reaction, CO2 dissolution, and amine-catalyzed hydration.

Conclusions:

The developed PEI-PANI chemiresistor sensor is effective for detecting CO2.
The sensor shows reliable performance in real-world air conditions, even with humidity.
This nanostructure-based sensor offers a promising approach for miniature gas sensing applications.