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Dual-Emissive Carbon Quantum Dot-Tb Nanocomposite as a Fluorescent Indicator for a Highly Selective Visual Detection of Hg(II) in Water
Author(s) -
Tapas Mondal,
Uttam Kumar Ghorai,
Shyamal K. Saha
Publication year - 2018
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.8b01159
Subject(s) - fluorescence , photoluminescence , luminescence , materials science , metal ions in aqueous solution , photochemistry , ion , photoinduced electron transfer , carbon fibers , quenching (fluorescence) , zeta potential , quantum dot , nanotechnology , analytical chemistry (journal) , chemistry , nanoparticle , electron transfer , optoelectronics , optics , organic chemistry , physics , composite number , composite material
We report very fast, green, and large-scale synthesis of amino-functionalized carbon quantum dots (CQDs) using a domestic microwave to investigate CQD-Tb-based dual emission for visual detection of toxic Hg 2+ . Citric acid and p -phenylenediamine are used as precursor materials to synthesize the CQD, which shows excitation-independent blue luminescence. To achieve the dual emission, Tb-containing CQD is synthesized in a very easy and cost-effective way. These dual-emissive fluorescent materials have been successfully used as a fluorescent indicator for visual detection of toxic Hg 2+ metal ions. An instant color change from blue to green in the presence of a very low amount of Hg 2+ under a UV lamp (λ 365nm ) is observed. The material is highly sensitive and selective toward detection of mercury ions in the presence of other metal ions. The photoluminescence quenching mechanism (photoinduced electron transfer process) has been explained using an electronic band diagram supported by zeta-potential and time-correlated single photon counting measurements.

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