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Preparation method for cadmium sulfide quantum dots

A technology for quantum dots and cadmium sulfide, which is applied in the field of preparation of cadmium sulfide quantum dots, can solve the problems of narrow size distribution, luminous efficiency, complicated operation steps, poor crystal shape of quantum dots, etc. Simple, uniform size results

Inactive Publication Date: 2012-08-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are mainly two synthesis methods for the preparation of cadmium sulfide quantum dots: one is aqueous phase synthesis, which uses relatively cheap reagents, relatively simple preparation conditions, and good biocompatibility, but the synthesized quantum dots have poor crystal form and poor surface The defect is obvious, the luminous efficiency is relatively low, and the size distribution is wide; the other is synthesized in an organic system by the method of colloid chemistry. This method has better crystal shape, less surface defects, narrow size distribution, and higher luminous efficiency. The raw materials are expensive, highly toxic, the operation steps are cumbersome, and the process is difficult to control

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  • Preparation method for cadmium sulfide quantum dots
  • Preparation method for cadmium sulfide quantum dots
  • Preparation method for cadmium sulfide quantum dots

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Embodiment 1

[0018] A method for preparing cadmium sulfide quantum dots of the present invention, using cadmium metal wire and thioacetamide (TAA) as raw materials, using an electrochemical method with a controllable current to electrolyze in an aqueous solution to synthesize cadmium sulfide quantum dots, specifically includes the following steps :

[0019] 1. After mixing the thioacetamide (TAA) solution with a concentration of 0.05-0.15 mol / L and the potassium chloride solution with a concentration of 1-3 mol / L, add mercaptopropionic acid and distilled water, and stir , use 1mol / L sodium hydroxide solution to adjust the pH value to 10-13 to obtain the electrolyte solution, wherein the mixing volume ratio of thioacetamide solution and potassium chloride solution is (1-3):(3-6); The volume ratio of thioacetamide solution, mercaptopropionic acid and distilled water is (1~3):(0.1~0.3):(20~30);

[0020] 2. Pass high-purity nitrogen gas into the electrolyte for 20-40 minutes, remove the air, ...

Embodiment 2

[0027] A method for preparing cadmium sulfide quantum dots of the present invention, using cadmium metal wire and thioacetamide (TAA) as raw materials, using an electrochemical method with a controllable current to electrolyze in an aqueous solution to synthesize cadmium sulfide quantum dots, specifically includes the following steps :

[0028] 1. Weigh 0.188 g of thioacetamide (TAA), dissolve it in 50 mL of water in a beaker, and prepare 50 mL of TAA solution with a concentration of 0.05 mol / L;

[0029] 2. Weigh 3.73 g of potassium chloride (KCl), dissolve it in 50 mL of water in a beaker, and prepare 50 mL of KCl solution with a concentration of 1 mol / L;

[0030] 3. Add 1 mL of TAA solution and 3 mL of KCl solution prepared above into a small beaker, stir to mix evenly; then add 100 uL of mercaptopropionic acid and 20 mL of water, and use 1 mol of / L of sodium hydroxide solution to adjust the pH to 10 to obtain the electrolyte;

[0031] 4. Before the start of electrolysis,...

Embodiment 3

[0034] A method for preparing cadmium sulfide quantum dots of the present invention, using cadmium metal wire and thioacetamide (TAA) as raw materials, using an electrochemical method with a controllable current to electrolyze in an aqueous solution to synthesize cadmium sulfide quantum dots, specifically includes the following steps :

[0035] 1. Weigh 0.563 g of thioacetamide (TAA), dissolve it in 50 mL of water in a beaker, and prepare 50 mL of TAA solution with a concentration of 0.15 mol / L;

[0036] 2. Weigh 11.18 g of potassium chloride (KCl), dissolve it in 50 mL of water in a beaker, and prepare 50 mL of KCl solution with a concentration of 3 mol / L;

[0037] 3. Add 3 mL of TAA solution and 6 mL of KCl solution prepared above into a small beaker, stir to mix evenly; then add 300uL mercaptopropionic acid and 30 mL of water, and use 1 mol / The sodium hydroxide solution of L adjusts the pH value to be 13, promptly obtains electrolytic solution;

[0038] 4. Before the sta...

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Abstract

The invention discloses a preparation method for cadmium sulfide quantum dots. The preparation method is characterized by including steps of uniformly mixing thioacetamide liquor with the concentration of 0.05-0.15mol / L and potassium chloride liquor with the concentration of 1-3mol / L, adding thiohydracrylic acid and water to stir, and adjusting a pH (potential of hydrogen) value to 10-13 so as to obtain electrolyte; leading high-purity nitrogen into the electrolyte and maintaining for 20-40 min to remove air; and inserting a cadmium metal wire of a working electrode and a platinum wire of an auxiliary electrode into the electrolyte to stir, then applying phase step oxidation current with 10-1000 microamperes onto the cadmium working electrode, electrolyzing for 60-240min, and obtaining cadmium sulfide quantum dot stock solution after electrolyzing. The preparation method has the advantages that the method is simple, convenient, environment-friendly and fast and is low in cost, water solubility of products is good, and the prepared cadmium sulfide quantum dots are uniform in size and good in fluorescence and electrochemiluminescence performance.

Description

technical field [0001] The invention relates to the technical field of preparation of nano inorganic compound semiconductor materials, in particular to a preparation method of cadmium sulfide quantum dots. Background technique [0002] Quantum dots (Quantum Dots, QDs) is a new kind of luminescent material, its particle size generally ranges from 2 to 20 nm, and it is generally composed of nanoparticles of group II ~ VI or group III ~ V elements. In recent years, due to their special physical and chemical properties, the research and application of quantum dots have attracted much attention and attention. Cadmium sulfide (CdS) quantum dots have good chemical stability, surface modification and unique photoelectric properties. application space. Therefore, while maintaining its good photoelectric properties, seeking a simple, "green", fast and safe synthesis method of CdS quantum dots has been a research hotspot. [0003] At present, there are mainly two synthesis methods f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
Inventor 郭智勇郝婷婷杜书平李琴芬
Owner NINGBO UNIV
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