Lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots

Abstract

The invention relates to lanthanide rare earth ytterbium-doped silver sulfide quantum dots, a preparing method thereof and applications of the quantum dots. The ytterbium-doped silver sulfide quantum dots are prepared by adopting silver sulfide quantum dots as a matrix, and by steps of doping Yb<3+> as an activating ion and growing a heterogeneous sulfur layer on the surfaces of the silver sulfide quantum dots. The chemical formula of the ytterbium-doped silver sulfide quantum dots is Ag2S:Yb<3+>. The preparing method includes 1) reacting sodium diethyldithiocarbamate trihydrate and silver nitrate to obtain a precursor; 2) dissolving the precursor into dodecanethiol, and heating and reacting the mixture to obtain the silver sulfide quantum dots; 3) mixing ytterbium acetate and olaquindox to obtain a ytterbium ion solution; 4) mixing sulfur powder and octadecene to obtain a sulfur solution; and 5) adding the silver sulfide quantum dots, the octadecene and the olaquindox into a reaction container, fully stirring the added materials, adding the ytterbium solution into the reaction container with existence of argon, reacting the mixture, then adding the sulfur solution, and reacting the mixture to obtain the lanthanide rare earth ytterbium-doped silver sulfide quantum dots. The lanthanide rare earth ytterbium-doped silver sulfide quantum dots have good photochemical performance and low toxicity.

Description

technical field [0001] The invention relates to the technical field of preparation of quantum dots, in particular to a lanthanide rare earth ytterbium-doped silver sulfide quantum dot and its preparation method and application. Background technique [0002] In recent years, molecular imaging technology has been developing day by day. Its application can improve the diagnosis level of diseases to the stage of molecular abnormalities, detect lesions at the molecular level, and directly observe a series of processes such as the cause, occurrence, and development of diseases in vivo, and observe Abnormal changes and characteristics of diseases at the genetic and molecular levels. As a key technology for molecular imaging, near-infrared fluorescence imaging is easy to operate, consumes less reagents, and has high sensing sensitivity to target molecules. It is a good method for functional imaging of biomolecules. Near-infrared (NIR) imaging depends on the fluorescent probe-near-i...

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Problems solved by technology

However, most of the current quantum dots are heavy metal sulfide selenide quantum dots, which are difficult to be widely used due to the presence of heavy metal toxic ions.

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