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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:22 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Solid State Physics and Materials Science, Optics, Spectroscopy, Plasma and Lasers
Title:
Highly-sensitive detection of ammonia using polymer based chemiresistive sensors
Authors:
Ana-Maria POPA (1,2), Andrei STOCHIOIU (1), Luiza-Izabela TODERAŞCU (1), Vlad-Andrei ANTOHE (2), Gabriel SOCOL (1) and 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), Splaiul Independenţei 54, 050094 Bucharest, Romania
E-mail
iulia.antohe@inflpr.ro,
ana.popa281@gmail.com
Keywords:
polyaniline, polypyrrole, conductive polymers, chemiresistive gas sensors, ammonia detection
Abstract:
Ammonia is a gas present everywhere in our surroundings, being produced even by our own bodies. However, at high concentrations, it can have harmful effects on our health, which highlights the crucial importance of detecting and monitoring its presence [1]. In this context, the chemiresistive sensors based on conductive polymers have been successfully proven to be advantageous gas sensing devices, since they present in general very good sensitivity, they have the ability to work at room temperature and they have a short response time [2].
In this work, polyaniline (PANi) and polypyrrole (PPy) conductive polymers were selected due to their affinity for ammonia detection [3, 4]. Both polymers were synthesized via chemical polymerization of their monomers directly on the interdigitated gold electrodes and have been further characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Moreover, the prepared sensors were electrically characterized in an in-house built gas testing setup. The electrical properties of the sensor inside the gas chamber were investigated using a source-meter while were direct exposed to ammonia concentrations varying from 1 to 1000 ppm.
A comparison study was performed between the both developed PANi and PPy based chemiresistive sensors in terms of stability, repeatability and sensitivity for ammonia.
References:
[1] Khan M. A.; International Journal of Electrochemical Science 12, 1711-1733, 2017.
[2] Das T. K. et al.; Polymer-Plastics Technology and Engineering 51(14), 1487-1500, 2012.
[3] Attout A. et al.; Surf. Interface Anal 40 (3-4), 657-660, 2008.
[4] Hao, L. et al.; Polymers, 14(23), 5139, 2022.
Acknowledgement:
This research was supported by the “Academy of Romanian Scientists” (AOSR), Splaiul Independenţei 54, 050094 Bucharest, Romania; by the National Authority for Research and Innovation in the framework of the Nucleus Programme—LAPLAS VII (grant 30N/2023); by the national fellowship program L’Oreal - Unesco “For Women in Science” 2022-2023.
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