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Nitrogen‐Doped Carbon Quantum Dots as a “Turn‐Off” Fluorescent Probes for Highly Selective and Sensitive Detection of Mercury(II) Ions
Author(s) -
Cheng Zhenfang,
Du Fuyou,
Sun Lingshun,
Jiang Liping,
Ruan Guihua,
Li Jianping
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803716
Subject(s) - quantum yield , detection limit , fluorescence , tap water , mercury (programming language) , photoluminescence , analytical chemistry (journal) , ion , carbon fibers , luminescence , materials science , nitrogen , quantum dot , carbon quantum dots , doping , metal ions in aqueous solution , chemistry , photochemistry , inorganic chemistry , nanotechnology , optoelectronics , chromatography , optics , physics , organic chemistry , environmental engineering , composite number , computer science , composite material , programming language , engineering
A facile, economical and straightforward hydrothermal strategy was used to prepare highly luminescent nitrogen‐doped carbon quantum dots (N‐CQDs) by using citric acid and urea as the precursors. The as‐prepared N‐CQDs exhibited excellent excitation‐wavelength‐dependent photoluminescence property, high relative fluorescence quantum yield of up to 82.4%, and high selective response to Hg 2+ over other examined metal ions in water samples. Under the optimal conditions, the response was linearly proportional to the Hg 2+ concentration in the range of 0–250 μM with a detection limit of 1.3 nM. The established N‐CQDs based fluorescent sensor was then successfully applied for label‐free detection of Hg 2+ in environmental water samples (tap, lake, and well water). Satisfactory repeatability, reproducibility, recovery results (92.6‐116.8%) are achieved for the determination of Hg 2+ in real water samples.