UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:09
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Conference: Bucharest University Faculty of Physics 2024 Meeting


Section: Solid State Physics and Materials Science


Title:
Methane detection at room temperature using a chemiresistive polyaniline-based sensor


Authors:
Ana-Maria POPA (1), Andrei STOCHIOIU (1), Luiza-Izabela TODERAŞCU (1), Vlad-Andrei ANTOHE (2), Gabriel SOCOL (1), Iulia ANTOHE (1,3)


*
Affiliation:
1) National Institute for Laser, Plasma and Radiation Physics (INFLPR), Atomiştilor Street 409, 077125 Măgurele, Ilfov, Romania

2) Faculty of Physics, Research and Development Center for Materials and Electronic & Optoelectronic Devices (MDEO), University of Bucharest, Atomiştilor Street 405, 077125 Măgurele, Ilfov, Romania

3) Academy of Romanian Scientists (AOSR), Ilfov 3, 050044 Bucharest, Romania


E-mail
Corresponding authors: iulia.antohe@inflpr.ro; gabriel.socol@inflpr.ro


Keywords:
polyaniline, conductive polymers, chemiresistive gas sensors, methane sensing


Abstract:
Gas monitoring technology is crucial for many industries, including the healthcare sector, industrial safety and environmental monitoring. Given the purpose of identifying potential risks, maintaining work safety and controlling emissions, it is essential to quickly and accurately detect a variety of toxic gases, including methane. [1] Chemiresistive sensors based on conductive polymers (i.e. polyaniline, polypyrrole) exhibit great sensitivity, quick response time and versatility, making them highly attractive devices for gas detection in ambient conditions [2-4]. In this study, the conductive polymer named polyaniline (PANi) was chosen for its ability to adapt to a vast variety of gases, including ammonia, methane and hydrogen. [5] This polymer was synthesized by chemically polymerizing its monomer directly on interdigitated gold electrodes. Employing investigative methods such as X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), further information about the sensor’s morphological and chemical characteristics was obtained. Additionally, an in-house gas testing equipment was used to electrically characterize the developed sensor. Using a source-meter, the electrical characteristics of the sensor inside the gas chamber were examined while it was subjected to different methane concentrations ranging from 1 to 50 ppm. In conclusion, the data acquired showed that the suggested sensor demonstrates a noticeable change in electrical resistance upon exposure to the gas, indicating its high sensitivity to detect small concentrations of methane, as low as 1 ppm.


References:

[1] Bezdek, M.J. et al.; A Chemiresistive Methane Sensor, Proceedings of the National Academy of Sciences of the United States of America 118(2),2021.

[2] Bai, H. and Shi, G.; Gas Sensors Based on Conducting Polymers, Sensors 7(3), 267–307, 2007.

[3] Verma, A. et al.; A Review of Composite Conducting Polymer-Based Sensors for Detection of Industrial Waste Gases, Sensors and Actuators Reports 5, 100143, 2023.

[4] Kushwaha, C.S. et al.; Advances in Conducting Polymer Nanocomposite Based Chemical Sensors: An Overview, Materials Science and Engineering: B 284, 115856, 2022.

[5] Fratoddi, I. et al.; Chemiresistive Polyaniline-Based Gas Sensors: A Mini Review, Sensors and Actuators B-chemical 220, 534–548, 2015.



Acknowledgement:
This research was supported by the National Authority for Research and Innovation in the framework of the Nucleus Programme—LAPLAS VII (grant 30N/2023) and by the “Academy of Romanian Scientists” (AOSR), Ilfov 3, 050044 Bucharest, Romania.