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2024-11-22 1:55

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Conference: Bucharest University Faculty of Physics 2021 Meeting

Section: Solid State Physics and Materials Science

Title:

Chemical polymerization of aniline on gold thin films for hydrogen gas sensing applications

Authors:

Andrei STOCHIOIU (1,3), Iulia ANTOHE (1), Theo MONACO (2), Quentin LOMBARD (2), Luiza-Izabela JINGA (1), Andreea MIHĂILESCU (1), Gianina POPESCU-PELIN (1) and Gabriel SOCOL (1)

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Affiliation:

1) National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Bucharest-Magurele, Romania

2) Institut Universitaire de Technologie, 142 traverse Charles Susini, 13013 Marseille, France

3) Faculty of Physics, University of Bucharest, Atomiștilor 405, RO-077125 Măgurele, Romania

E-mail

andrei.stochioiu@inflpr.ro

Keywords:

Conductometric sensors, Gold, Polyaniline synthesis, Hydrogen sensor

Abstract:

Hydrogen measurement is crucial in emerging industries that employ liquid H2 as an energy source. Hydrogen gas leak detectors, such as the one described in the present work, are used to prevent any accident because of the high explosion risks it has in the presence of air, as these can lead to serious injuries and damage. Polyaniline (PANi) has been proven to be an advantageous material for producing gas sensing devices, having very good sensitivity and short response times [1]. In this work, conductive PANi thin films were obtained via chemical polymerization of aniline directly on gold thin film and have been characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), and then electrically characterized in a gas chamber. Aniline was polymerized on the substrate in an acidic solution bath with ammonium persulfate and hydrochloric acid according to a method described in the literature [2,3]. The electrical properties of the sensor inside the gas chamber have been investigated using a source-meter while under direct expose to hydrogen gas at varying concentrations. The developed PANi based sensor proved to be a very good hydrogen gas detector with reasonable sensitivity at very low concentrations of just 1 ppm H2.

References:

[1] H. Bai, G. Shi, Chemiresistive gas sensors based on conducting polymers, Mater. Sci. Eng. Concepts, Methodol. Tools, Appl. 7 (2007) 267–307. https://doi.org/10.4018/978-1-5225-1798-6.ch022.

[2] A. Attout, S. Yunus, P. Bertrand, Electroless deposition of polyaniline: Synthesis and characterization, Surf. Interface Anal. 40 (2008) 657–660. https://doi.org/10.1002/sia.2702.

[3] A.B. Nagare et al., Chemiresistive ammonia gas sensor based on branched nanofibrous polyaniline thin films, J. Mater. Sci. Mater. Electron. 30 (2019) 11878–11887. https://doi.org/10.1007/s10854-019-01514-7.

Acknowledgement:

This work was financially supported by the National Authority for Research and Innovation in the frame of Nucleus Programme - LAPLAS VI (contract 16N/08.02.2019) and by the Executive Agency for Higher Education, Research, Development and Innovation (UEFISCDI) funding, Project PD 195/2020 (PN-III-P1-1.1-PD-2019-0466). We also acknowledge the doctoral scholarship from University of Bucharest, Faculty of Physics.