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

A technology of core-shell quantum dots and nuclear quantum dots, which is applied in the detection of trace explosives 4-nitrotoluene, and in the field of preparation of CdSe/ZnS core-shell quantum dots, which can solve the problem of no public 4-nitrotoluene compound technology Enlightenment, did not disclose the technical characteristics of core-shell quantum dot nitroaromatic compound nanomaterials, etc., to achieve the effects of good fluorescence stability, stable structure, and increased reaction rate

Inactive Publication Date: 2014-02-05
SHANDONG JIAOTONG UNIV
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Problems solved by technology

[0006] The above-mentioned documents do not disclose the technical characteristics of using core-shell quantum dots as nanomaterials for the dete

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

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Example Embodiment

[0032] Example 1: A method for preparing CdSe / ZnS core-shell quantum dots, the steps are as follows:

[0033] (1) 5mL of deionized water, add 0.19mmol NaOH while stirring, and pass N 2 After 10 minutes, add 0.035mmol of Se powder, add 0.051mmol of A1 powder after 10 minutes of reaction, heat up to 85℃, ultrasonic for 15min, get clear Na 2 Se precursor solution;

[0034] (2) Dissolve 0.12mmol of cadmium perchlorate in 50mL of deionized water, add 0.120mmol of methionine and 0.125mmol of mercaptopropionic acid under stirring, and adjust the pH to 8.5 with a 10% by mass NaOH solution -9.0, stirring at room temperature for 10min, adding Na 2 The Se precursor solution is heated to 85°C and ultrasonicated for 25 minutes to prepare a CdSe nuclear quantum dot solution;

[0035] (3) Add 0.110mmol of methionine and 0.110mmol of mercaptopropionic acid to the CdSe nuclear quantum dot solution, and keep it at 85°C for 10 minutes; at the same time, add 4.5mL of 0.01mol / L thioacetamide solution and...

Example Embodiment

[0038] Example 2: Drawing a standard curve, the steps are as follows:

[0039] (1) Dissolve 4-nitrotoluene in water / acetonitrile with a volume ratio of 1:2 to obtain 2.4×10 -9 mol / L~3.1×10 -7 mol / L 4-nitrotoluene standard solution; Dissolve the CdSe / ZnS quantum dots prepared in Example 1 in a phosphate buffer to prepare a 0.02 mg / mL CdSe / ZnS quantum dot solution;

[0040] (2) Take 1mL CdSe / ZnS quantum dot solution and 20uL 4-nitrotoluene standard solution in a 10mL colorimetric tube, dilute to 10mL with deionized water, shake it up, and after standing for 10min, add an appropriate amount of the Transfer the solution to a quartz cuvette, use 415nm as the excitation wavelength, and the excitation and emission slits are both 5nm, record the functional relationship between the fluorescence emission intensity at 580nm and the concentration of 4-nitrotoluene, and draw a standard curve;

[0041] 4-Nitrotoluene has a fluorescence quenching effect on CdSe / ZnS quantum dots; the concentration o...

Example Embodiment

[0045] Example 3 Detection of trace amounts of 4-nitrotoluene

[0046] (1) Accurately weigh out 5.000g sample, add 20ml water / acetonitrile extraction solution with a volume ratio of 1:1, then add 0.10g disodium ethylenediaminetetraacetic acid, ultrasound for 30 minutes, centrifuge at room temperature, extract the supernatant and residue Use the extract to extract once, combine the two extracts, filter, and spin-evaporate the filtrate to dryness and dilute to 1.00 ml to prepare a sample solution of 4-nitrotoluene;

[0047] (2) Take 1mL of CdSe / ZnS quantum dot solution and 20uL of 4-nitrotoluene sample solution in a 10mL colorimetric tube, dilute to 10mL with deionized water, shake it, and after standing for 5min, add an appropriate amount Transfer the solution to a quartz cuvette, use 415nm as the excitation wavelength, and record the fluorescence emission intensity at 580nm;

[0048] According to the standard curve, the concentration C of 4-nitrotoluene was calculated and the recove...

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Abstract

The invention discloses a preparation method of CdSe/ZnS core-shell quantum dots and an application of the CdSe/ZnS core-shell quantum dots in detecting trace explosive 4-nitrotoluene, and belongs to the technical fields of analytic chemistry and nanometer. The CdSe/ZnS core-shell quantum dots are produced from cadmium perchlorate, selenium powder, aluminum powder, methionine, thiohydracrylic acid, cadmium chloride, thioacetamide and zinc chloride; and the quantum dots are used for detecting the explosive 4-nitrotoluene. The method has high sensitivity, and is capable of detecting the 4-nitrotoluene low to 2.4*10<-9>mol/L.

Description

technical field [0001] The invention relates to a preparation method and application of CdSe / ZnS core-shell quantum dots, in particular to a preparation method of CdSe / ZnS core-shell quantum dots and an application for detecting trace explosives 4-nitrotoluene, belonging to analytical chemistry , Nanomaterial technology field. Background technique [0002] Nanomaterials have special structures and many characteristics different from traditional solid materials, such as surface effects, small size effects, quantum size effects, and macroscopic quantum tunneling effects. Quantum dots, also known as semiconductor nanocrystals, are nanocrystals composed of II-VI or III-V elements with a size between 1-100nm. [0003] Due to the small particle size and large specific surface area of ​​quantum dots, the surface contains more structural defects, which leads to the increase of electron traps in the forbidden band. When electrons or holes transition between the valence band and the ...

Claims

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Application Information

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IPC IPC(8): G01N21/64B82Y40/00
Inventor 匡芮杨文科赵海丽冯攸联闫荣金刘一石朱晓丽
Owner SHANDONG JIAOTONG UNIV
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