Citation
Abstract
A long-term sensitivity performance of conducting polymers and metal-organic frameworks coated on side-polished plastic optical fibre (SP-POF) was presented. SP-POF is an excellent option for potential long-distance and remote gas sensing and monitoring application. The presence of functional groups, porosity and surface area of the active materials were validated by Raman, Fourier transform infrared (FT-IR), X-Ray diffraction (XRD) and BET analyses. The sole copper-based metal-organic framework (HKUST-1)-coated SP-POF exhibited a good sensitivity (0.83/vol%) with a response time of 1.54 min. Further, the influence of acid dopants and oxidants on the optical response of doped-polyaniline (the emeraldine salt, ES) to 1% ammonia (NH3) gas was also optimised. Significant influence of HKUST-1 and emeraldine base (EB) on long-term optical NH3 sensitivity of emeraldine salt (ES)-coated SP-POF were related to NH3 desorption rate and affinity of the materials towards atmospheric vapour. ES-EB composite has exhibited higher NH3 sensitivity to the sole ES and ES-(HKUST-1) with minimal loss of sensitivity to a set of high NH3 gas concentrations over 70 days. ES-EB coated SP-POF has exhibited minimal sensitivity loss to NH3 gas throughout the test duration with a 7.8% decrease followed by ES (28.1%) and ES-(HKUST-1) (50.86%). Development of SP-POF coated with ES-EB composite is a viable approach to retain good optical NH3 sensitivity and stability at room temperature with a relative humidity of ~50%.
Download File
Full text not available from this repository.
Official URL or Download Paper: https://www.sciencedirect.com/science/article/pii/...
|
Additional Metadata
Item Type: | Article |
---|---|
Divisions: | Faculty of Engineering Faculty of Science Institute of Advanced Technology |
DOI Number: | https://doi.org/10.1016/j.sna.2022.113395 |
Publisher: | Elsevier |
Keywords: | Ammonia gas sensor; Conducting polymers; MOF composite; Optical sensor; Sensor ageing; Degradation assessment |
Depositing User: | Ms. Che Wa Zakaria |
Date Deposited: | 18 Aug 2023 23:44 |
Last Modified: | 18 Aug 2023 23:44 |
Altmetrics: | http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.sna.2022.113395 |
URI: | http://psasir.upm.edu.my/id/eprint/101896 |
Statistic Details: | View Download Statistic |
Actions (login required)
View Item |