Fluorescence Properties of ZnOQDs-GO-g-C3N4 Nanocomposites

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 center dot 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 similar to 100 mu M. The regression equation was found to be F-0/F = 0.9687 + 0.12343C. The detection limit of Cu2+ was about 1.74 mu M. The quenching mechanism was also analyzed.

Automated summary

This paper investigates the fluorescence properties of ZnOQD-GO-g-C3N4 composite materials (ZCGQDs). The addition of a silane coupling agent (APTES) in the synthesis process is explored, and it is found that the addition of 0.04 g/mL APTES results in the highest relative fluorescence intensity and quenching efficiency. The selectivity of ZCGQDs for metal ions, especially Cu2+, is studied, and ZCGQDs show good selectivity. The linear relationship between Cu2+ concentration and ZCGQDs fluorescence intensity in the range of 1 to 100 μM is established, with a detection limit of about 1.74 μM.