Preparation method of Ag+ doped CdTe quantum dots, product thereof and application of product

A technology of quantum dots and deionized water, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of low test sensitivity, small detection range of mercury ion concentration, long time consumption, etc. Effect

Active Publication Date: 2019-01-25
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0007] Currently, for Hg 2+ The detected quantum dot system mainly includes Cd-based quantum dots, such as CdSe, CdTe or CdS; in order to improve the quantum light rate and photochemical stability, CdSe / ZnS, CdTe / CdS, CdTe / ZnS quantum dots with core-shell structure are also used in Hg 2+ However, due to the complex preparation process, time-consuming and difficult preparation of quantum dots with core-shell structure, there is no report of practical application
[0008] Therefore, the current practical application of Hg 2+ The detected quantum dots still have problems such as low test sensitivity and small range of linear correlation between fluorescence intensity and mercury ion concentration, which leads to a small detection range of mercury ion concentration by quantum dot fluorescent probes

Method used

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  • Preparation method of Ag+ doped CdTe quantum dots, product thereof and application of product
  • Preparation method of Ag+ doped CdTe quantum dots, product thereof and application of product
  • Preparation method of Ag+ doped CdTe quantum dots, product thereof and application of product

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Embodiment 1

[0047] (1) Preparation of CdTe: Ag by aqueous phase method + powder:

[0048] Sodium borohydride and tellurium powder are used as raw materials, deionized water is used as a solvent, and a transparent sodium telluride hydride solution is formed by reacting at 30°C for 2-3 hours in a nitrogen atmosphere. With Cd(NO 3 ) 2 , AgNO 3 As raw material, mercaptopropionic acid as stabilizer, by molar ratio Cd(NO 3 ) 2 :AgNO 3 : mercaptopropionic acid=19:1:40 mix and dissolve in deionized water, slowly add 1M sodium hydroxide solution dropwise while stirring, adjust pH=6, transfer the solution to a 250ml three-necked round-bottomed flask, in a nitrogen atmosphere, Stir at 80°C for 30min. Rapidly inject the newly prepared sodium telluride hydride solution into a three-necked round-bottomed flask, and condense and reflux at 100°C for 24 hours under a nitrogen atmosphere. Add the same volume of acetone to the clear and transparent solution obtained by the reaction, and centrifuge t...

Embodiment 2

[0057] The preparation process is the same as that in Example 1, except that in step (1), 1M sodium hydroxide solution is added dropwise to adjust the pH to 4.5.

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Abstract

The invention discloses a preparation method of Ag+ doped CdTe quantum dots, a product thereof and application of the product in Hg2+ detection. The preparation method includes the following steps that (1) soluble salt of metal Cd, soluble salt of metal Ag and a stabilizer are mixed and dissolved in deionized water, the pH value is regulated to be 4.5-6, and a mixed solution is obtained; (2) undera protective atmosphere, a newly-prepared sodium hydrogen telluride solution and the mixed solution prepared in step (1) are mixed to be uniform, and after a reflux condensation reaction, aftertreatment is performed to obtain CdTe:Ag+ powder; (3) a ligand exchange is adopted to prepare the Ag+ doped CdTe quantum dots. According to the preparation method, the process is simple and controllable; the prepared Ag+ doped CdTe quantum dots form new doping peaks in photoluminescence spectra, so that when a quantum dot fluorescence probe is used for Hg2+ detection, the fluorescence intensity and theHg2+ concentration have two linear correlation regions, and the Hg2+ detection range of the quantum dot fluorescence probe is widened.

Description

technical field [0001] The invention relates to the field of preparation of quantum dots, in particular to an Ag + Preparation method of doped CdTe quantum dots and its products and applications. Background technique [0002] Mercury is a toxic pollutant that is persistent, bioaccumulative, and biomagnifying. It has a great negative impact on human health and the ecological environment. It is urgent to establish a detection system for mercury ions to effectively control mercury pollution and reduce or avoid its harm. [0003] Traditional mercury ion detection methods mainly include atomic fluorescence spectrometry, mass spectrometry, inductively coupled plasma, atomic emission spectrometry, spectrophotometry, cyclic voltammetry, etc. These methods have high sensitivity and good precision, but the operation is cumbersome, complicated, time-consuming, and the required instruments are expensive, which is not conducive to popularization and use. [0004] Atomic fluorescence s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88G01N21/64
CPCC09K11/883G01N21/643G01N2021/6432
Inventor 赵高凌卢王威詹凌曈李华正韩高荣
Owner ZHEJIANG UNIV
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