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Preparation method and application of CdTe/ZnS core-shell quantum dots

A technology of core-shell quantum dots and quantum dots, which is applied in the field of analytical chemistry and nanotechnology, can solve the problems of no public disclosure of quantum dots to detect nitroaromatic compounds, technical characteristics of quantum dot nanomaterials, etc., and achieve structural Stability, good fluorescence stability, and the effect of increasing the reaction rate

Inactive Publication Date: 2014-02-05
SHANDONG JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above documents do not disclose the technical characteristics of using quantum dots as nanomaterials for the detection of nitroaromatic compounds, nor do they publicly disclose the use of quantum dots as a technical inspiration for the detection of nitroaromatic compounds

Method used

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  • Preparation method and application of CdTe/ZnS core-shell quantum dots
  • Preparation method and application of CdTe/ZnS core-shell quantum dots
  • Preparation method and application of CdTe/ZnS core-shell quantum dots

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: A kind of CdTe / ZnS core-shell quantum dots, the preparation steps are as follows:

[0035] Dissolve 0.12 mmol of cadmium perchlorate in 50 mL of deionized water, add 0.105 mmol of methionine and 0.105 mmol of mercaptopropionic acid under stirring, adjust the pH of the solution to 8.5-9.0 with triethanolamine, and stir at room temperature for 10 min , adding 0.035mmol of sodium tellurite (Na 2 TeO 3 ), raising the temperature to 85°C, ultrasonication for 10min, adding 0.045mmol of hydrazine hydrate, and ultrasonication for 10min, to obtain a CdTe nuclear quantum dot solution;

[0036] Add 0.105mmol of methionine and 0.105mmol of mercaptopropionic acid to the CdTe nuclear quantum dot solution, and keep warm for 10min; at the same time, add dropwise 4.0mL of 0.01mol / L thioacetamide solution and 0.05mol / L zinc chloride solution 2.5mL, the dropping time is 5min; 85℃ ultrasonication for 15min to prepare CdTe / ZnS core-shell quantum dot solution;

[0037] The p...

Embodiment 2

[0039] Embodiment 2: draw the standard curve that detects trace amount of nitrobenzene, the steps are as follows:

[0040] (1) Dissolve nitrobenzene in water / acetonitrile with a volume ratio of 1:1.5 to obtain 3.2×10 -9 mol / L~2.7×10 -7 mol / L nitrobenzene standard solution; CdTe / ZnS core-shell quantum dots were dissolved in phosphate buffer to prepare a 0.025 mg / mL CdTe / ZnS core-shell quantum dot solution;

[0041] (2) Take 1mL of CdTe / ZnS core-shell quantum dot solution and 20uL of nitrobenzene standard solution in a 10mL colorimetric tube, dilute to 10mL with deionized water, shake it well, let it stand for 5min, and then add an appropriate amount of This solution transfers in the quartz cuvette, uses 395nm as the excitation wavelength, records the functional relationship between the fluorescence emission intensity and the standard solution concentration of nitrobenzene, and draws a standard curve;

[0042] Nitrobenzene has a fluorescence quenching effect on CdTe / ZnS core-s...

Embodiment 3

[0045] Embodiment 3: the detection of sample

[0046] (1) Dissolve nitrobenzene in water / acetonitrile with a volume ratio of 1:1.5 to obtain 3.0×10 -9 mol / L nitrobenzene standard solution; CdTe / ZnS core-shell quantum dots were dissolved in phosphate buffer to prepare a 0.025 mg / mL CdTe / ZnS core-shell quantum dot solution;

[0047] (2) Accurately weigh 5.000g of sample, add 20mL of water / acetonitrile extraction solution with a volume ratio of 1:1, then add 0.10g of disodium ethylenediaminetetraacetate, ultrasonicate for 30min, centrifuge at room temperature, extract the supernatant, and recycle the residue Extract once with the extract, combine the two extracts, filter, rotary evaporate the filtrate to dryness, and dilute to 1.0mL to prepare a sample solution of nitrobenzene;

[0048] (3) Take 1mL CdTe / ZnS core-shell quantum dot solution and blend it with 20uL nitrobenzene sample solution, dilute it to 10mL with deionized water, shake it well, and after standing still for 5min...

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Abstract

The invention discloses a CdTe / ZnS core-shell quantum dot, a preparation method of the CdTe / ZnS core-shell quantum dots and an application of the CdTe / ZnS core-shell quantum dots in detecting trace explosive, and belongs to the technical fields of analytic chemistry and nanometer. The CdTe / ZnS core-shell quantum dots are produced from cadmium perchlorate, methionine, thiohydracrylic acid, sodium tellurite, hydrazine hydrate, thioacetamide and zinc chloride; and the quantum dots are used for detecting the explosive nitrobenzene. The method is capable of detecting the nitrobenzene low to 1.2*10<-9>mol / L.

Description

technical field [0001] The invention relates to a CdTe / ZnS core-shell quantum dot, a preparation method thereof and an application for detecting trace explosive nitrobenzene, belonging to the technical fields of nanotechnology and analytical chemistry. Background technique [0002] Quantum dots (quantum dots) are granular objects with a three-dimensional size below 100nm composed of a small number of atoms. The movement of electrons inside them is restricted in all directions. Therefore, the quantum confinement effect is particularly obvious, which leads to discontinuous electrons similar to atoms. Energy level structure, therefore, quantum dots are also called artificial atoms. Quantum dots have many unique nano-properties, one of which is luminescent properties. Changes in the size and chemical composition of quantum dots can make their fluorescence emission wavelengths cover the entire visible light region or even the infrared region. The smaller the size, the wavelength ...

Claims

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Application Information

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IPC IPC(8): C09K11/88C01B19/04C01G9/08
Inventor 匡芮闫荣金杨文科赵海丽刘一石朱晓丽冯攸联
Owner SHANDONG JIAOTONG UNIV
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