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Self-assembled polyaniline nanostructures in situ deposited on silica optical fibers for ammonia gas sensing

Ibrahim, Siti Azlida and Abdul Rahman, Norizah and Yaacob, Mohd. Hanif and Abu Bakar, Muhammad Hafiz and Mohamad, Fatimah Syahidah and Mohd. Yahya, Nor Akmar and Md. Yusoff, Nelidya and Mahdi, Mohd. Adzir (2022) Self-assembled polyaniline nanostructures in situ deposited on silica optical fibers for ammonia gas sensing. Synthetic Metals, 283 (NA). pp. 1-8. ISSN 0379-6779

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Official URL: http://dx.doi.org/10.1016/j.synthmet.2021.116962

Abstract

Optical fibers coated with polyaniline (PANI) nanostructures were used to sense ammonia gas (NH3) concentration. The PANI nanostructures were synthesized using the oxidative polymerization process in a solution containing poly(methyl vinyl ether-alt-maleic acid) (PMVEA). The PANI nanostructures were in situ deposited on silica optical fibers by immersing the fibers in the solution during the polymerization process for specific durations. The morphology and the thickness of the PANI nanostructure coatings were characterized using Scanning Electron Microscopy (SEM). Raman and Fourier Transform Infra-red (FTIR) spectra confirmed that the PANI nanostructures were in the emeraldine salt (ES) state. The sensors were exposed to various concentrations of NH3 gas at room temperature. The sensor with a coating thickness of 639 nm shows the highest response with a cumulative absorbance response of 2.2 towards 1% NH3 in synthetic air. The response and recovery times are 2.82 min and 11.52 min, respectively.

Item Type:Article
Uncontrolled Keywords:ammonia gas sensor, conducting polymer, optical absorbance, polyaniline nanostructures
Subjects:Q Science > Q Science (General)
Divisions:Razak School of Engineering and Advanced Technology
ID Code:104550
Deposited By: Yanti Mohd Shah
Deposited On:14 Feb 2024 05:54
Last Modified:14 Feb 2024 05:54

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