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A Facile Hg 2+ ‐related Quenching Photoluminescence Sensor Based on Nitrogen‐doped Graphene Quantum Dots
Author(s) -
Du ShiMan,
Shang BingBing,
Zhang XiaoRu,
Feng Fu,
Zhang ShengHui,
Qi BaoPing
Publication year - 2020
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12095
Subject(s) - photoluminescence , quantum dot , graphene , quenching (fluorescence) , masking agent , detection limit , quantum yield , selectivity , luminescence , materials science , tap water , analytical chemistry (journal) , fluorescence , absorption spectroscopy , photochemistry , spectroscopy , chemistry , inorganic chemistry , nanotechnology , optoelectronics , catalysis , optics , chromatography , organic chemistry , quantum mechanics , environmental engineering , physics , engineering
A Hg 2+ ‐related quenching photoluminescence (PL) sensor was fabricated based on nitrogen‐doped graphene quantum dots (N‐GQDs) as the luminescent agent and glutathione as the masking agent to detect Hg 2+ in tap water. The addition of Hg 2+ significantly reduced the PL intensity of N‐GQDs, which was attributed to coordination reaction inducing the aggregation of N‐GQDs. The Hg 2+ ‐related quenching PL sensor with glutathione as the masking agent has good selectivity and accuracy. The sensor showed a linear relationship ranging from 0.5 to 110 nM with the detection limit 0.08 nM (S/N = 3). The proposed method was applied to the determination of Hg 2+ in tap water, and the results were consistent with atomic absorption spectroscopy (AAS).