Speaker
Description
Many industries such as the healthcare industry, industrial safety and environmental monitoring require gas detection equipment. The precise and quick detection of various gases, including methane (CH4) is a very important factor in recognizing possible hazards, ensuring workplace safety and managing emissions. [1] Chemiresistive sensors based on conductive polymers such as polyaniline have shown great sensitivity, quick reaction time and adaptability, making them promising tools for gas detection at room temperature [2,3].
In this study, polyaniline (PANi) conductive polymer was selected due to its well-known adaptability to a variety of gases, including ammonia, hydrogen, and methane. [4] This polymer was synthesized via chemical polymerization of its monomer directly on the interdigitated gold electrodes and its properties have been further investigated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to provide morphological and chemical information. 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 CH4 concentrations ranging from 1 to 20 ppm.
In conclusion, the data acquired showed that the suggested sensor demonstrates a noticeable decrease in electrical resistance upon exposure to the analyte, indicating its high sensitivity to detect small concentrations of the analyte, as low as 1 ppm.
Affiliations:
- National Institute for Laser, Plasma and Radiation Physics (INFLPR), Atomiştilor Street 409, 077125 Măgurele, Ilfov, Romania
- Faculty of Physics, Research and Development Center for Materials and Electronic & Optoelectronic Devices (MDEO), University of Bucharest, Atomiştilor Street 405, 077125 Măgurele, Ilfov, Romania
- Academy of Romanian Scientists (AOSR), Ilfov 3, 050044 Bucharest, Romania
Keywords: polyaniline, conductive polymers, chemiresistive gas sensors, methane sensing
Acknowledgments:
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.
References:
[1] Leve, Z.D. et al.; The Synergistic Properties and Gas Sensing Performance of Functionalized Graphene-Based Sensors, Materials 15, 2022.
[2] Bai, H. and Shi, G.; Gas Sensors Based on Conducting Polymers, Sensors 7(3), 267–307, 2007.
[3] Liu, X. et al.; Conducting Polymer-Based Nanostructures for Gas Sensors, Coordination Chemistry Reviews 462, 214517, 2022.
[4] Fratoddi, I. et al.; Chemiresistive Polyaniline-Based Gas Sensors: A Mini Review, Sensors and Actuators B-chemical 220, 534–548, 2015.
