Preparation method of CeCl3:Eu<3+> fluorescent probe array

Abstract

A preparation method of a CeCl3:Eu<3+> fluorescent probe array comprises the following four steps: 1, preparing a Eu(NO3)3 solution by using EuO to obtain an activator solution; 2, preparing a substrate solution by using Ce(NO3)3; 3, adjusting the pH value of a mixed solution formed by Eu(NO3)3, Ce(NO3)3, NaCl and citric acid to 6.0, and performing a reaction to obtain a CeCl3:Eu<3+> fluorescent probe; and 4, and performing silicon chip treatment and ion etching to obtain the fluorescent probe array. The emission spectrum band is red, and the negatively charged carboxyl group on the surface ofthe CeCl3:Eu<3+> fluorescent probe and a positively charged paraquat molecule spatially get close to each other due to anion and cation interaction, so fluorescence resonance energy transfer occurs,the fluorescence intensity of the fluorescent probe array is reduced, selective identification and detection of the paraquat molecule are realized, and the detection limit is 10<-9> mol.L<-1>.

Description

technical field [0001] The invention relates to the field of material science, in particular to CeCl with paraquat detection 3 :Eu 3+ Preparation method of fluorescent probe array. Background technique [0002] Paraquat (Paraquat) is a fast-killing herbicide with contact action and certain systemic action. The chemical name is 1-1-dimethyl-4-4-bipyridine cationic salt, which can be quickly absorbed by the green tissue of plants , so that it dies, it can control various annual weeds, has a strong killing effect on perennial weeds, and has no effect on non-green tissues. In the soil, it quickly combines with the soil to passivate, and is ineffective for plant roots, perennial rhizomes and perennial roots. Paraquat is extremely toxic to humans and has no specific antidote. It has been banned or strictly restricted in more than 20 countries. The diagnosis of paraquat poisoning is mainly based on the history of exposure and the clinical manifestations of mainly lung damage ac...

AI Technical Summary

Problems solved by technology

The CdTe quantum dot fluorescent probe prepared by this process is relatively cumbersome, and the emission wavelength of the quantum dot fluorescent probe is easily affected by the external environment, the photochemical stability is poor, and the fluorescence lifetime is short, which is far inferior to the performance of the rare earth fluorescent probe.

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