Abstract
In this study, water-dispersible manganese (II)-ion-doped ZnS nanocrystals (ZnS:Mn NCs) were synthesized by capping the surface with polar cysteamine (Cyst) molecules. The obtained NC products were physically and optically characterized using various spectroscopic methods. Additionally, the surface charge and the degree of aggregation for the ZnS:Mn-Cyst NCs in water were determined using electrophoretic and hydrodynamic light scattering methods. The results indicated the formation in water of NC agglomerates with an average size of 278 nm and a positive surface charge (+10.39 mV) at ambient temperature. The positively charged NCs were applied as photosensors for the detection of a specific anion in an aqueous solution. As a result, the ZnS:Mn-Cyst NCs showed an exclusive luminescence quenching effect upon addition of nitrite (NO2− ) ions. Finally, the Stern-Volmer kinetic study on the luminescence quenching mechanism proposed an energy transfer via dynamic collisions between the oppositely charged ZnS:Mn-Cyst NCs and NO2− ions.
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Sim, Y., Hwang, CS. Photosensor Activities of Cysteamine-Capped ZnS:Mn Nanocrystals in the Direct Detection of Nitrite Ions by Fluorescence Quenching in Aqueous Solutions. Journal of the Korean Physical Society 72, 424–430 (2018). https://doi.org/10.3938/jkps.72.424
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DOI: https://doi.org/10.3938/jkps.72.424