One-step synthesis of a dual-emitting carbon dot-based ratiometric fluorescent probe for the visual assay of Pb2+ and PPi and development of a paper sensor

Yifang Gao; Yuan Jiao; Huilin Zhang; Wenjing Lu; Yang Liu; Hui Han; Xiaojuan Gong; Lei Li; Shaomin Shuang; Chuan Dong

doi:10.1039/C9TB01203F

One-step synthesis of a dual-emitting carbon dot-based ratiometric fluorescent probe for the visual assay of Pb²⁺ and PPi and development of a paper sensor†

Yifang Gao,^a Yuan Jiao,^a Huilin Zhang,^a Wenjing Lu,^a Yang Liu,^a Hui Han,^a Xiaojuan Gong,

^a Lei Li,

^ab Shaomin Shuang

^a and Chuan Dong

*^a

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* Corresponding authors

^a Department Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, China
E-mail: dc@sxu.edu.cn
Fax: +86-351-7018613
Tel: +86-351-7018613

^b Department of Chemical & Petroleum Engineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA, USA

Abstract

Herein, an easy and effective ratiometric fluorescent nanoprobe for the selective detection of Pb²⁺ and pyrophosphate (PPi) was developed based on label-free carbon dots (CDs). The CDs showed dual emission bands at 477 and 651 nm under a single-wavelength excitation (391 nm). Pb²⁺ and PPi were sequentially detected by the sensor with high reliability and accuracy via the exploitation of the fluorescence intensity ratio (F₄₇₇/F₆₅₁). The dual emission sensor exhibited high selectivity and excellent sensitivity for Pb²⁺ and PPi than for other analytes with detection limits as low as 0.055 μM and 0.089 μM, respectively. Moreover, the fluorescent CDs changed from pink to cyan and from cyan to pink and could be used as a fluorescent paper sensor for the visual detection of Pb²⁺ and PPi. To the best of our knowledge, this is the first report on the ratiometric fluorescence detection of Pb²⁺ and PPi by CDs; therefore, the as-synthesized CDs show great potential for application in the determination of Pb²⁺ and PPi in real samples.

Journal of Materials Chemistry B

One-step synthesis of a dual-emitting carbon dot-based ratiometric fluorescent probe for the visual assay of Pb²⁺ and PPi and development of a paper sensor†

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One-step synthesis of a dual-emitting carbon dot-based ratiometric fluorescent probe for the visual assay of Pb²⁺ and PPi and development of a paper sensor

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Journal of Materials Chemistry B