Abstract
In this study, surface plasmon resonance (SPR) technique has been utilized to characterize the optical properties of chitosan-graphene quantum dots (CS-GQDs) thin film and dopamine (DA). Theoretical fitting of SPR dips yielded refractive indices of DA solutions and CS-GQDs thin films, as well as the thickness of the thin film. For DA solution, n and k values were the same as deionized water for all concentrations. The values of n and k for CS-GQDs thin film were 1.6990 and 0.1302 respectively before contacting DA. The experimental SPR reflectance curves obtained using CS-GQDs thin film were shifted continuously to the right with increasing DA concentrations. After adsorption of DA molecules, both n and thickness of the CS-GQDs thin film increased, while the value of k decreased. This, in turns, enhanced the SPR sensitivity towards DA. The obtained results underscore the appropriate and sufficient potential of the used technique to measure refractive index variations in real-time when very low concentration was used (1 fM) with refractive index sensitivity of 10.186°/RIU.
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Acknowledgements
F.B.K.E. acknowledges the support received from OWSD and Sida (Swedish International Development Cooperation Agency), the laboratory facilities provided by the Institute of Advanced Technology, Department of Physics, Department of Chemistry, Universiti Putra Malaysia.
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This research was funded by the Ministry of Education Malaysia through the Fundamental FRGS (FRGS/1/2019/STG02/UPM/02/1) and Universiti Putra Malaysia through Putra Grant (GP-IPB/2021/9700700).
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Conceptualization, Y.W.F. and F.B.K.E.; methodology, writing—original draft preparation, F.B.K.E.; supervision, validation, funding acquisition, Y.W.F.; writing—review and editing, Y.W.F. and F.B.K.E.; resources, Y.W.F., J.Y.C.L., and W.M.E.M.M.D.; software, Y.W.F., A.R.S., F.B.K.E., and W.M.E.M.M.D.; visualization, F.B.K.E. All authors have read and agreed to the published version of the manuscript.
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Eddin, F.B.K., Fen, Y.W., Sadrolhosseini, A.R. et al. Optical Property Analysis of Chitosan-Graphene Quantum Dots Thin Film and Dopamine Using Surface Plasmon Resonance Spectroscopy. Plasmonics 17, 1985–1997 (2022). https://doi.org/10.1007/s11468-022-01680-1
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DOI: https://doi.org/10.1007/s11468-022-01680-1