Ag@Fe3O4-coated U-shaped plastic optical fiber sensor for H2S detection

Consultable a partir de

2026-02-15

Date

2024

Authors

López Vargas, Juan David
Dante, Alex
Allil, Regina C.
Werneck, Marcelo M.

Director

Publisher

Elsevier
Acceso embargado / Sarbidea bahitua dago
Artículo / Artikulua
Versión aceptada / Onetsi den bertsioa

Project identifier

Impacto

Abstract

This work presents the fabrication of U-shaped plastic optical fiber (POF) sensors for hydrogen sulfide (H2S) detection, coated with Fe3O4 nanoparticles synthetized using the Pulsed Laser Ablation in Liquid (PLAL) technique. The Fe3O4 nanoparticles were synthetized in ultra-pure water and in silver nitrate solution, resulting in two colloidal samples with different morphological, optical, and structural properties. The Fe3O4 nanoparticles were coated onto one POF sensor, while the other sensor was coated with a nanostructure composed of Ag as the core and Fe3O4 as the shell (Ag@Fe3O4). The performance of both sensors was evaluated by exposing them to different concentrations of H2S and other gases such as CH4, H2, and CO2. All experiments were conducted at 25 °C. Results showed that the sensor coated with Ag@Fe3O4 was 12 times more sensitive to H2S compared to the sensor coated with Fe3O4, with a detection limit of 1 ppm and a rise time of 15 s. Moreover, the POF sensor coated with Ag@Fe3O4 presented high selectivity to H2S, making it a promising candidate for H2S detection in different applications. The sensor's performance was also evaluated with a relative humidity range of 20–90%, exhibiting a minimal 0.75% signal variation at 90% humidity.

Description

Keywords

Hydrogen sulfide sensor, Nanoparticles, Optical fiber, Pulsed laser ablation in liquid

Department

Ingeniería Eléctrica, Electrónica y de Comunicación / Institute of Smart Cities - ISC / Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren

Faculty/School

Degree

Doctorate program

item.page.cita

Lopez-Vargas, J. D., Dante, A., Allil, R. C., Del Villar, I., Matias, I. R., Werneck, M. M. (2024) Ag@Fe3O4-coated U-shaped plastic optical fiber sensor for H2S detection. Sensors and Actuators B: Chemical, 401, 1-11. https://doi.org/10.1016/j.snb.2023.135054.

item.page.rights

© 2023 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0.

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