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Selective detection of diethanolamine utilizing an LMR/LSPR-based optical fiber sensor
Kavita1, Jyoti1, Shruti Gupta2
1Department of Physics, Central University of Rajasthan, NH-8 Bandarsindri, Ajmer 305817, Rajasthan, India. rkverma@curaj.ac.in.
The Analyst
|September 16, 2022
Summary
A novel optical fiber sensor detects diethanolamine (DEA), a chemical used in crude oil processing. The sensor, enhanced with gold nanoparticles, shows significantly improved sensitivity for safer industrial applications.
Area of Science:
- Optoelectronics and Sensor Technology
- Materials Science
- Analytical Chemistry
Background:
- Diethanolamine (DEA) is crucial for removing toxic gases like hydrogen sulfide (H2S) in crude oil refining and is used in pharmaceuticals.
- Accurate detection of DEA is vital due to its potential harmful effects.
- Existing detection methods may lack the sensitivity or specificity required for industrial safety.
Purpose of the Study:
- To design and develop a highly sensitive lossy mode resonance (LMR)-based optical fiber sensor for diethanolamine detection.
- To investigate the performance enhancement of the sensor by incorporating biosynthesized gold nanoparticles (AuNPs).
- To compare the sensing capabilities of a titanium dioxide (TiO2) coated probe with a TiO2/AuNP bilayer coated probe.
Main Methods:
- Fabrication of an optical fiber probe coated with a bulk layer of titanium dioxide (TiO2) (probe-1).
- Fabrication of a second probe by coating biosynthesized gold nanoparticles onto the TiO2 layer (probe-2).
- Characterization of surface morphology using FESEM, HRTEM, and UV-visible spectroscopy.
- Comparative analysis of sensor performance including sensitivity, figure of merit, limit of detection, repeatability, and response time.
Main Results:
- The TiO2/AuNP bilayer-coated probe (probe-2) exhibited a sensitivity of 16,079.63 nm RIU-1 (0.074 nm mM-1).
- This sensitivity was approximately double that of the TiO2 bulk layer-coated probe (probe-1).
- Selectivity experiments confirmed the sensor's high sensitivity specifically towards DEA.
Conclusions:
- The developed LMR-based optical fiber sensor, particularly the TiO2/AuNP bilayer configuration, offers significantly enhanced sensitivity for DEA detection.
- The incorporation of biosynthesized gold nanoparticles is an effective strategy to improve sensor performance.
- This sensor technology holds promise for accurate and sensitive monitoring of DEA in industrial and pharmaceutical applications.
