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Highly sensitive surface plasmon resonance optical detection of ferric ion using CTAB/hydroxylated graphene quantum dots thin film


Citation

Anas, Nur Ain Asyiqin and Yap, Wing Fen and Yusof, Nor Azah and Sheh Omar, Nur Alia and Mohd Daniyal, Wan Mohd Ebtisyam Mustaqim and Md Ramdzan, Nur Syahira (2020) Highly sensitive surface plasmon resonance optical detection of ferric ion using CTAB/hydroxylated graphene quantum dots thin film. Journal of Applied Physics, 128 (8). pp. 1-11. ISSN 0021-8979, 1089-7550

Abstract

The development of optical sensors for heavy metal ion detection has been rapidly growing; unfortunately, the current methods suffer limitations that led to the emergence of an outstanding technique called surface plasmon resonance (SPR) spectroscopy. In this paper, the performance of the SPR optical sensor in detecting ferric ions (Fe3+) was successfully enhanced by depositing novel cetyltrimethylammonium bromide modified hydroxylated graphene quantum dots (CTAB/HGQDs) onto a gold (Au) thin film using the spin coating technique. Upon exposure to Fe3+, the SPR responses of both CTAB/HGQDs thin film and bare Au thin film were compared and studied, emphasizing the sensitivity, binding affinity, full width at half maxima, signal-to-noise ratio, and data accuracy. The CTAB/HGQDs thin film achieved a high sensitivity value of 29.886° ppm−1 for Fe3+ up to 0.1 ppm. The strong binding affinity was confirmed using the Langmuir isotherm model calculation. To the end, the CTAB/HGQDs thin film was characterized using atomic force microscopy for morphological study, confirming its interaction with Fe3+.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
Centre of Foundation Studies for Agricultural Science
DOI Number: https://doi.org/10.1063/5.0018106
Publisher: American Institute of Physics
Keywords: Heavy metal; Ion; Optical sensor; Ferric
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 20 Sep 2021 23:51
Last Modified: 20 Sep 2021 23:51
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1063/5.0018106
URI: http://psasir.upm.edu.my/id/eprint/89190
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