双发射碳量子点比率型荧光探针测定环境水样中Ag<sup>+</sup>

doi:10.11896/cldb.24110233

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Abstract A new single excitation dual-emission carbon quantum dots (OP-CQDs) was prepared by one-step hydrothermal method using o-phenylene-diamine (OPD) as the ingredient. The OP-CQDs had independent double emission peaks at 348 nm and 557 nm under the excitation at 300 nm. In the presence of Ag⁺, the fluorescence signal at 348 nm was quenched, while the signal at 557 nm was almost unchanged. Therefore, a novel Ag⁺ratiometric fluorometric method was established using the fluorescence reference signal at 557 nm and the response signal at 348 nm. The detection limit for Ag⁺was 4.0×10^-8 mol/L, and the concentration of Ag⁺showed two linear relationships with F₅₅₇/F₃₄₈ within the scope of 5.0×10^-8—3.0×10^-6 mol/L and 3.0×10^-6—5.0×10^-5 mol/L. Moreover, the reaction mechanism was investigated and discussed by the variation of UV-Vis absorption spectrum and the change of quenching constant caused by temperature change. The fluorescence probe is simple, fast and highly sensitive for Ag⁺detection in environmental water.

Key words： dual-emission carbon quantum dot o-phenylenediamine (OPD) ratiometric fluorescent probe silver ion (Ag⁺)

Published: Online: 2026-02-13

CLC number:

O657.3

Corresponding Authors: Mahy6614@163.com

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	ZHANG Yuecheng
	LI Miao
	ZHANG Yarong
	ZHANG Xinjie
	SUN Lingbo
	MA Hongyan

Cite this article:

ZHANG Yuecheng,LI Miao,ZHANG Yarong, et al. A Dual-emission CQDs Ratiometric Fluorescent Probe for Detecting Ag⁺ in Environmental Water Samples[J]. Materials Reports, 2026, 40(3): 24110233-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24110233 OR https://www.mater-rep.com/EN/Y2026/V40/I3/24110233

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