Abstract
Although plenty of carbon dots have been synthesized by many kinds of synthesis methods, their potential in metal sensing applications is still limited. Herein, the application of carbon dots-cellulose nanocrystals (CDs-CNC) thin film towards manganese ions sensing was demonstrated experimentally using surface plasmon resonance (SPR) sensor. The experimental results showed that the CDs-CNC thin film-based SPR sensor provides the detection of parts per billion concentrations of Mn2+ in an aqueous solution with high sensitivity response of 0.0534° ppb-1. The thickness and refractive index of thin films were then determined by fitting the experimental SPR spectra using the WinSpall simulation program. The proposed CDs-CNC thin film-based SPR sensor exhibit better sensing performance in comparison to the previous film-based sensor, suggesting the suitable technology candidate for environmental monitoring applications.
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