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Luminescence Enhancement based Sensing of L‐Cysteine by Doped Quantum Dots
Author(s) -
Pramanik Sabyasachi,
Roy Shilaj,
Bhandari Satyapriya
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202000466
Subject(s) - luminescence , quantum yield , quantum dot , passivation , doping , detection limit , ion , cysteine , materials science , metal ions in aqueous solution , chemistry , photochemistry , analytical chemistry (journal) , nanotechnology , optoelectronics , fluorescence , physics , optics , organic chemistry , layer (electronics) , chromatography , enzyme
The interaction of a presynthesized orange emitting Mn 2+ ‐doped ZnS quantum dots (QDs) with L‐Cysteine (L−Cys) led to enhance emission intensity (at 596 nm) and quantum yield (QY). Importantly, the Mn 2+ ‐doped ZnS QDs exhibited high sensitivity towards L−Cys, with a limit of detection of 0.4±0.02 μM (in the linear range of 3.3–13.3 μM) and high selectivity in presence of interfering amino acids and metal ions. The association constant of L−Cys was determined to be 0.36×10 5 M −1 . The amplified passivation of the surface of Mn 2+ ‐doped ZnS QDs following the incorporation and binding of L−Cys is accounted for the enhancement in their luminescence features. Moreover, the luminescence enhancement‐based detection will bring newer dimension towards sensing application.