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. 2023 Mar 23;14(4):711.
doi: 10.3390/mi14040711.

Fluorescence Properties of ZnOQDs-GO-g-C3N4 Nanocomposites

Tianze Liu  1 , Lei Wang  2 , Ruxue Jiang  2 , Yashi Tang  2 , Yuxin He  2 , Changze Sun  3 , Yuguang Lv  2 , Shuang Liu  4
Affiliations

Fluorescence Properties of ZnOQDs-GO-g-C3N4 Nanocomposites

Tianze Liu et al. Micromachines (Basel). .

Abstract

In this paper, the fluorescence properties of ZnOQD-GO-g-C3N4 composite materials (ZCGQDs) were studied. Firstly, the addition of a silane coupling agent (APTES) in the synthesis process was explored, and it was found that the addition of 0.04 g·mL-1 APTES had the largest relative fluorescence intensity and the highest quenching efficiency. The selectivity of ZCGQDs for metal ions was also investigated, and it was found that ZCGQDs showed good selectivity for Cu2+. ZCGQDs were optimally mixed with Cu2+ for 15 min. ZCGQDs also had good anti-interference capability toward Cu2+. There was a linear relationship between the concentration of Cu2+ and the fluorescence intensity of ZCGQDs in the range of 1~100 µM. The regression equation was found to be F0/F = 0.9687 + 0.12343C. The detection limit of Cu2+ was about 1.74 μM. The quenching mechanism was also analyzed.

Keywords: fluorescence probe; fluorescence properties; metal ion; nanocomposites.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Fluorescence emission spectra of ZCGQDs; (b) relative fluorescence intensity with the addition of 20 µM Cu2+ to ZCGQDs.
Figure 2
Figure 2
The plot of relative fluorescence intensity versus time.
Figure 3
Figure 3
(a) Fluorescence spectra of the different heavy metal ions added; (b) relative fluorescence intensity of the different heavy metal ions added.
Figure 4
Figure 4
Relative fluorescence intensity of ZCGQDs in the coexistence of Cu2+ with other metal ions.
Figure 5
Figure 5
(a) Fluorescence spectra of different concentrations of Cu2+; (b) fitted curve of the linear relationship.
Figure 6
Figure 6
(a) HRTEM image of ZCGQDs; (b) HRTEM image of ZCGQDs after Cu2+ was added.
Figure 7
Figure 7
UV–vis absorption spectra of mixed colloids.
See this image and copyright information in PMC

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