The novel up/down-conversion dual-emission carbon dots for dual-channel ratiometric fluorescence detection of pH and Cu2

[Display omitted] •Novel up/down-conversion dual-emission carbon dots (U/D-CDs) were prepared successfully.•The up/down-conversion ratiometric fluorescence probes based on U/D-CDs for pH and Cu2+ sensing were developed, respectively.•The probes for pH and Cu2+ sensing achieved the fluorescence visua...

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Bibliographic Details
Published inSpectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 320; p. 124648
Main Authors Zhu, Yulin, Zhu, Mengqi, Zhou, Qiuju, Shu, Qunwei, Tan, Kejun
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.11.2024
Subjects
Carbon dots
Copper ions
pH response
Ratiometric fluorescence
Up/down-conversion
Ratiometric fluorescence
pH response
Carbon dots
Copper ions
Up/down-conversion
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Summary:[Display omitted] •Novel up/down-conversion dual-emission carbon dots (U/D-CDs) were prepared successfully.•The up/down-conversion ratiometric fluorescence probes based on U/D-CDs for pH and Cu2+ sensing were developed, respectively.•The probes for pH and Cu2+ sensing achieved the fluorescence visualization.•The up-conversion probe can eliminate background fluorescence interferences. Up/down-conversion dual-emission carbon dots (U/D-CDs) are rare and have potential in analytical sensing. Herein, a kind of novel U/D-CDs was prepared successfully by a one-step solvothermal method. The prepared U/D-CDs exhibited similar dual-emission behaviors at excitation wavelengths of 300 nm and 680 nm, respectively. In addition, U/D-CDs displayed good photostability and salt-resistance. Due to the protonation-deprotonation, U/D-CDs showed strong pH dependence in the pH range of 2.0–8.0, which developed an up/down-conversion dual-channel ratiometric fluorescence (FL) probe of pH. The FL intensity of U/D-CDs can be effectively quenched by Cu2+ through the static quenching effect. Meanwhile, an obvious color change from yellow-green to blue can be observed under ultraviolet light with the increase of Cu2+ concentration. The up/down-conversion dual-channel ratiometric fluorescence sensor can be used for the visual sensing of pH and Cu2+, which also eliminates background signals and improves its accuracy and selectivity in complex samples.
ISSN:1386-1425
DOI:10.1016/j.saa.2024.124648