Dual-mode colorimetric and fluorescent detection of cobalt ions based on N, B co-doped carbon quantum dots and p-phenylenediamine derived nanoparticles

Nitrogen, boron co-doped carbon quantum dots (gCQDs), and a coloration probe (PPD-NPs) with response to cobalt ions (Co 2+ ) were prepared by using 4-hydroxyphenylboric acid as the common precursor, with ethylenediamine and p-phenylenediamine (PPD) adopted as nitrogen-doped reagents, respectively. A...

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Bibliographic Details
Published in:Mikrochimica acta (1966) 2024-05, Vol.191 (5), p.233-233, Article 233
Main Authors: Hu, Anqi, Chen, Guoqing, Li, Lei, Ma, Chaoqun, Yang, Taiqun, Gao, Hui, Gu, Jiao, Zhu, Chun, Wu, Yamin
Format: Article
Language:English
Subjects:
Absorption spectra
Analytical Chemistry
Black tea
Carbon dots
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cobalt
Colorimetry
Drinking water
Ethylenediamine
Fluorescence
Microengineering
Nanochemistry
Nanoparticles
Nanotechnology
Nitrogen
Original Paper
Phenylenediamine
Quantum dots
Reagents
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Summary:Nitrogen, boron co-doped carbon quantum dots (gCQDs), and a coloration probe (PPD-NPs) with response to cobalt ions (Co 2+ ) were prepared by using 4-hydroxyphenylboric acid as the common precursor, with ethylenediamine and p-phenylenediamine (PPD) adopted as nitrogen-doped reagents, respectively. A noticeable brown-to-purple color change can be observed with the addition of Co 2+ , and a broad absorption band emerges at 535 nm. At the same time, gCQDs, which is introduced as the fluorescence signal source, will be significantly quenched due to the enhanced inner filtration effect, induced by the overlap between the emission spectrum of gCQDs and the emerging absorption band. Therefore, a colorimetric/fluorescent dual-mode sensing probe for Co 2+ is constructed by combining the recognition unit PPD-NPs and the fluorescent gCQDs into PPD-NP/gCQD. Under the optimized experimental conditions, the calculated limits of detection are 1.51 × 10 −7 M and 3.75 × 10 −7 M for the colorimetric mode and the fluorescence mode, respectively, well qualified for the determination of Co 2+ maximum permitted level in drinking water. The feasibility of the proposed method has been verified in tap water, lake water, and black tea samples. Graphical Abstract
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-024-06310-7