NDLI: Optical sensing of ultra-trace $As^{3+}$ species using 2-mercaptoethanol capped CdTe Quantum Dots in aqueous medium

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Optical sensing of ultra-trace $As^{3+}$ species using 2-mercaptoethanol capped CdTe Quantum Dots in aqueous medium

Content Provider	Scilit
Author	Aman, Gyanan Khatei, Jayakrishna Mondal, Sandip Kumar, Arvind Mallik, Ramesh Chandra
Copyright Year	2019
Description	Journal: Materials Research Express This work describes the optical response of luminescent colloidal CdTe quantum dots (QDs) stabilized with 2-mercaptoethanol (ME) and thioglycolic acid (TGA) synthesized by a one-pot hydrothermal method for sensing As3+ ions in aqueous solution. The sensing behavior of CdTe QDs were determined by examining the fluorescence spectra with the varying molar concentration of As3+ ions in the solution. The fluorescence peaks of TGA-CdTe QDs (λ = 648 nm) depreciated in the presence of As3+ ions. However, ME-CdTe QDs (λ = 610 nm) peaks got enhanced in the presence of As3+ ions. The quenching responses of TGA-CdTe fluorescence peak is attributed to a non-radiative relaxation process due to the presence of traps states on the surface. On the other hand, luminescence enhancement of ME-CdTe QDs can be ascribed to the active surface-related radiative decay, owing to surface passivation of dangling bonds in QDs or due to the formation of higher bandgap AsTe shell structure formed on the ME-CdTe QDs. The detection limit in this method was found to be 10 nM L-1. Hence, establishing ME-CdTe as a suitable probe for ultra-trace detection of As3+ ion in aqueous solution.
Related Links	https://iopscience.iop.org/article/10.1088/2053-1591/ab57d7/pdf
ISSN	20531591
e-ISSN	20531591
DOI	10.1088/2053-1591/ab57d7
Journal	Materials Research Express
Issue Number	12
Volume Number	6
Language	English
Publisher	IOP Publishing
Publisher Date	2019-11-14
Access Restriction	Open
Subject Keyword	Journal: Materials Research Express
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics

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