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Preparation method of cadmium sulfide quantum dots

A technology of quantum dots and cadmium sulfide, which is applied in the field of preparation of cadmium sulfide quantum dots, can solve the problems of few reports of electrochemical and electrocatalytic properties.

Inactive Publication Date: 2018-11-30
QIDONG CHUANGLU NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, studies on QDs have mainly focused on their optical properties, while few studies on their electrochemical and electrocatalytic properties have been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of cadmium sulfide quantum dots, comprising the steps of: adding 25 parts of MPA with a volume fraction of 98% to 70 parts of CdCl with a concentration of 0.02mol / L 2 In the solution, stir magnetically at 30°C for 15 minutes, then adjust the pH to 9.5 with NaOH with a concentration of 1mol / L, continue stirring for 40 minutes, and finally add 30 parts of NaOH with a concentration of 0.02mol / L slowly. 2 S solution, stirred evenly, transferred the solution to a round-bottomed flask, heated and refluxed at 70°C for 12h to obtain MPA-wrapped CdS QDs; mixed the obtained quantum dot solution with 65 parts of absolute ethanol, and centrifuged at 15000r / min for 8min, The resulting precipitate was dispersed in 8 parts of water, 25 parts of isopropanol was added, centrifuged again, washed, and repeated three times, and finally the precipitate was dispersed in water to obtain a quantum dot stock solution, which was stored at 4°C in the dark; all raw materials ar...

Embodiment 2

[0017] A preparation method of cadmium sulfide quantum dots, comprising the steps of: adding 20 parts of MPA with a volume fraction of 98% to 65 parts of CdCl with a concentration of 0.02mol / L 2 In the solution, stir magnetically at 25°C for 10 minutes, then adjust the pH to 9.4 with NaOH with a concentration of 1 mol / L, continue stirring for 35 minutes, and finally add 25 parts of NaOH with a concentration of 0.02 mol / L slowly. 2 S solution, stirred evenly, transferred the solution to a round-bottomed flask, heated and refluxed at 65°C for 11h to obtain MPA-wrapped CdS QDs; mixed the obtained quantum dot solution with 60 parts of absolute ethanol, and centrifuged at 15000r / min for 5min, The resulting precipitate was dispersed in 7 parts of water, 20 parts of isopropanol was added, centrifuged again, washed, and repeated three times, and finally the precipitate was dispersed in water to obtain a quantum dot stock solution, which was stored at 4°C in the dark; all raw materials ...

Embodiment 3

[0019] A preparation method of cadmium sulfide quantum dots, comprising the steps of: adding 30 parts of MPA with a volume fraction of 98% to 75 parts of CdCl with a concentration of 0.02mol / L 2 In the solution, stir magnetically at 35°C for 20 minutes, then adjust the pH to 9.6 with NaOH with a concentration of 1 mol / L, continue stirring for 45 minutes, and finally add 35 parts of NaOH with a concentration of 0.02 mol / L slowly. 2 S solution, stirred evenly, transferred the solution to a round-bottomed flask, heated and refluxed at 75°C for 13h to obtain MPA-wrapped CdS QDs; mixed the obtained quantum dot solution with 70 parts of absolute ethanol, and centrifuged at 15000r / min for 10min, The resulting precipitate was dispersed in 9 parts of water, 30 parts of isopropanol was added, centrifuged again, washed, and repeated three times, and finally the precipitate was dispersed in water to obtain a quantum dot stock solution, which was stored at 4°C in the dark; all raw materials...

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Abstract

The invention discloses a preparation method of cadmium sulfide quantum dots. The preparation method comprises: adding MPA into a CdCl2 solution, stirring the solution for 10-20min, adjusting pH to 9.4-9.6 through NaOH, stirring the solution for 35-45min, adding a Na2S solution into the mixture, carrying out uniform stirring, transferring the solution into a round bottom flask, carrying out heating reflux at 65 to 75 DEG C for 11-13h to obtain MPA-coated CdS QDs, mixing the quantum dot solution and absolute ethanol, carrying out centrifugation, dispersing the precipitates in water, adding isopropanol into the solution, carrying out centrifugation and washing, repeating the above process three times, dispersing the precipitates in water to obtain a quantum dot stock solution and storing thequantum dot stock solution at 4 DEG C in the dark. The preparation method is simple, is easy to operate, successfully prepares cadmium sulfide quantum dots with good chemical stability and good photoelectric properties, has good sensitizing effects on the Ru(bpy)3<2+> ECL signal and has a great market prospect.

Description

technical field [0001] The invention relates to a preparation method of cadmium sulfide quantum dots. Background technique [0002] Electrochemiluminescence (ECL) detection technology has the advantages of high sensitivity, good selectivity, and strong controllability, and is widely used in the detection of various substances. Ruthenium terpyridine (Ru(bpy) 3 2+ ) is one of the earliest ECL substances, and is widely used because of its good solubility, high luminous efficiency, redox reversibility, and stable chemical properties. Ru(bpy) 3 2+ The ECL generally requires the participation of co-reactants, commonly used co-reactants are tripropylamine (TPrA), C 2 o 2- 4 , N 2 h 4 , S 2 o 2- 8 etc. Although they have good sensitization effects, they have problems such as poor stability, toxicity, and background interference, which limit Ru(bpy) 3 2+ applications in certain fields. Quantum dots (QDs) are a new type of semiconductor nanomaterials with excellent opto...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00B82Y40/00
CPCC09K11/883B82Y20/00B82Y40/00
Inventor 不公告发明人
Owner QIDONG CHUANGLU NEW MATERIAL CO LTD
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