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

被引：7

作者：

Lopez-Vargas, Juan D. ^{[1
,2
]}

Dante, Alex ^{[3
]}

Allil, Regina C. ^{[4
]}

Del Villar, Ignacio ^{[5
,6
]}

Matias, Ignacio R. ^{[5
,6
]}

Werneck, Marcelo M. ^{[1
,4
]}

机构：

[1] Univ Fed Rio de Janeiro, Nanotechnol Engn Res Program, Rio De Janeiro, Brazil

[2] Univ Tecnol Pereira, Grp Plasma Laser & Aplicac GPLA, Risaralda, Colombia

[3] Inst Adv Studies IEAv, Photon Div EFO S, Sao Jose Dos Campos, Brazil

[4] Univ Fed Rio de Janeiro, Elect Engn Res Program, Rio De Janeiro, Brazil

[5] Univ Publ Navarra, Elect Elect & Commun Engn Dept, Pamplona 31006, Spain

[6] Univ Publ Navarra, Inst Smart Cities ISC, Pamplona 31006, Spain

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2024年 / 401卷

关键词：

Optical fiber; Hydrogen sulfide sensor; Pulsed laser ablation in liquid; Nanoparticles; SURFACE-PLASMON RESONANCE; FE3O4; NANOPARTICLES; MAGNETITE;

D O I：

10.1016/j.snb.2023.135054

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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 degrees 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.

引用

页数：11