Development of water-based polyaniline sensor for hydrazine detection

Hussin, Hazira and Gan, Seng-Neon and Phang, Sook-Wai (2021) Development of water-based polyaniline sensor for hydrazine detection. Sensors and Actuators A: Physical, 317. ISSN 0924-4247, DOI

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In this study, water-soluble polyaniline-methylcellulose complex (PAni-MC) was applied as an environmental friendly chemical sensor for hydrazine detection. PAni was rendered water-soluble through chemical modification with MC. Fourier transform infrared (FTIR) and Ultraviolet-visible (UV-vis) spectroscopies confirmed the chemical structures of PAni-MC to be the conducting emeraldine salt form with electrical conductivity values of 0.068 S cm(-1) for pristine PAni and 0.132 S cm(-1) for PAni-MC respectively. In the hydrazine detection procedure, PAni-MC solution was added into samples containing various concentrations of hydrazine (10-100 ppm) and the sensor responses were recorded using a conductivity meter. Several parameters have been studied, including (i) different volume ratio of PAni to hydrazine, (ii) different mass ratio of aniline (Ani) monomer to MC, and (iii) detection at low concentration range of hydrazine (1-10 ppm). From the results obtained, PAni-MC (volume ratio 2:5 of PAni-MC: hydrazine) with the mass ratio 0.2:1 of Ani: MC has achieved the best sensitivity of 0.0143 ppm(-1), hence it was selected to further study its sensor performance. Calibration has shown a good sensitivity of 0.0132 ppm(-1) and a good linear correlation (R-2 = 0.9953), the limit of detection (LOD) of 0.55 ppm, and the limit of quantitation (LOQ) of 1.82 ppm respectively. The sensor performance was supported by UV-vis and FTIR analyses. Significant decrease in the UV-vis absorbance was observed at bipolaron (similar to 821 nm) and polaron (similar to 450 nm) bands, meanwhile the intensity of quinoid/benzenoid (I-Q/I-B) ratio in the FTIR spectra has shown a decrease from 1.03 to 0.97. In real sample analysis, PAni-MC eventually indicated the best recovery range of 96-136 % and a good relative standard deviation (RSD) of 2.69-5.84 %. (C) 2020 Elsevier B.V. All rights reserved.

Item Type: Article
Funders: Universiti Malaya [RG271-13AFR] [PG198-2016A], Tunku Abdul Rahman University College, Ministry of Education, Malaysia
Uncontrolled Keywords: Water-soluble polyaniline; Methylcellulose; Hydrazine; Sensor
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 11 Apr 2022 01:53
Last Modified: 11 Apr 2022 01:53

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