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Literature DB >> 30707370

Nitrogen doped graphene quantum dots as a fluorescent probe for mercury(II) ions.

Yongfeng Liu¹, Xiaosheng Tang¹, Ming Deng¹, Yulong Cao¹, Yujia Li¹, Hua Zheng¹, Fuhui Li¹, Fabin Yan¹, Tianyi Lan¹, Leilei Shi¹, Lei Gao¹, Ligang Huang¹, Tao Zhu², Hao Lin¹, Yongzhong Bai³, Dingrong Qu³, Xianbin Huang³, Feng Qiu³.

Abstract

A highly selective fluorescent probe for Hg2+ is reported. It consists of nitrogen doped graphene quantum dots (NGQDs) that are nearly spherical in shape, have an average diameter of 2.7 nm and excitation-independent emission. The blue fluorescence of the NGQDs (with maximum excitation/emission at 378/447 nm) is quenched by Hg2+ due to both dynamic and static quenching. The probe has a wide detection range (2.5 μM - 800 μM) and a limit of detection of 2.5 μM. The dynamic and static quenching constants are 417 M-1 and 63500 M-1, respectively. The probe was used to quantfy Hg2+ in spiked real water samples with satisfactory results. Graphical abstract ᅟ.

Entities: Chemical Gene

Keywords: Fluorescence quenching; Fluorescent probe; Hg2+ detection; Modified Stern-Volmer equation; Nitrogen doped graphene quantum dots; Static and dynamic quenching

Year: 2019 PMID： 30707370 DOI： 10.1007/s00604-019-3249-4

Source DB: PubMed Journal: Mikrochim Acta ISSN： 0026-3672 Impact factor: 5.833

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