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A Carbon‐Dot‐Based Fluorescent Probe for the Sensitive and Selective Detection of Copper(II) Ions
Author(s) -
Zheng Xiaochun,
Liu Wenjun,
Gai Qixiao,
Tian Zhaoshuo,
Ren Shoutian
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.201803584
Subject(s) - fluorescence , fourier transform infrared spectroscopy , copper , fluorescence spectroscopy , metal ions in aqueous solution , transmission electron microscopy , quantum yield , spectroscopy , materials science , selectivity , adsorption , infrared spectroscopy , ion , carbon fibers , analytical chemistry (journal) , chemistry , scanning electron microscope , nuclear chemistry , photochemistry , nanotechnology , chromatography , organic chemistry , chemical engineering , catalysis , optics , physics , composite material , quantum mechanics , composite number , metallurgy , engineering
Fluorescent carbon dots (CDs) are widely applied for the detection of heavy metal ions due to their nontoxicity, high sensitivity and stability. In this work, CDs were synthesized by a simple and green pyrolysis method without complicated post‐processing procedures and characterized by transmission electron microscope, X‐ray diffraction, fourier transform infrared spectroscopy, UV‐visible spectrophotometer and fluorescence spectroscopy. The CDs exhibited a relatively narrow size distribution of 3.5‐8.6 nm with an average size of 6.1 nm and their surface was decorated with abundant functional groups such as hydroxy and amino groups. They exhibited a strong fluorescent peak at 468 nm with a quantum yield of 25% under 365 nm UV irradiation. The CDs exhibited a strong fluorescence response to 70 μM Cu 2+ with the sensitivity up to 77% due to the complexation between the amino groups decorated on the CD surface and the adsorbed copper ions. They also exhibited short response times of less than 1 min, high response selectivity and good stability.