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Size-controllable synthesis method for MSe (M equal to Cd, Pb) nanocrystals

A nano-crystal and size technology, applied in the fields of chemistry, materials science, and biology, can solve problems such as troubles, achieve strong operability, mild synthesis conditions, and less demanding effects

Inactive Publication Date: 2010-10-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

, however, since the precursors need to be synthesized by themselves, multi-step synthesis procedures are required to obtain the product quantum dots, which is troublesome

Method used

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  • Size-controllable synthesis method for MSe (M equal to Cd, Pb) nanocrystals
  • Size-controllable synthesis method for MSe (M equal to Cd, Pb) nanocrystals
  • Size-controllable synthesis method for MSe (M equal to Cd, Pb) nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] The preparation of example 1CdSe quantum dot:

[0028] This example uses the preparation of CdSe quantum dots to illustrate the preparation method of the present invention.

[0029] 1. [Cd(SG) 2 ] 2+ preparation of

[0030] will be 5.5×10 -5 mol glutathione (GSH) was dissolved in 11mL of 0.1M NaOH solution except peroxygen, under inert atmosphere, add 2.2×10 -5 mol cadmium chloride (CdCl 2 ) solution.

[0031] 2. -Se + Preparation of:

[0032] At room temperature and inert atmosphere, 8.8×10 -5 mol GSH, 2.2×10 -5 mol Na 2 SeO 3 , 8.8×10 -5 mol coenzyme II (NADPH) and glutathione reductase (GR) were mixed in 3 mL of pH 7.2 BR solution.

[0033] 3. Quantum dot generation

[0034] After raising the temperature of the solution in step (1) to 90°C, quickly add the freshly prepared solution in step (2) to (1), react at 90°C for 30 minutes, and cool to room temperature to obtain the desired CdSe quantum dots .

[0035] At fixed [Cd(SG) 2 ] 2+ with-Se + Under...

example 2

[0036] The preparation of example 2PbSe nano cubes:

[0037] 1. [Pb(SG) 2 ] 2+ Preparation of:

[0038] will be 5.5×10 -6 mol glutathione (GSH) was dissolved in 11mL of 0.1M NaOH solution except peroxygen, under inert atmosphere, add 2.2×10 -6 mol lead acetate (Pb(Ac) 2 ) solution.

[0039] 2. -Se + Preparation of:

[0040] At room temperature and inert atmosphere, 8.8×10 -6 mol GSH, 2.2×10 -6 mol Na 2 SeO 3 , 8.8×10 -6 mol coenzyme II (NADPH) and glutathione reductase (GR) were mixed in 3 mL of pH 7.2 BR solution.

[0041] 3. Crystal formation

[0042] After raising the temperature of the solution in step (1) to 90°C, quickly add the freshly prepared solution in step (2) into (1), react at 90°C for 10 minutes, and cool to room temperature to obtain the desired PbSe nanocube .

[0043] At fixed [Pb(SG) 2 ] 2+ with-Se + Under the condition of the solubility product, only change [Pb(SG) in the above steps 2 ] 2+ with-Se + The molar ratio (the molar ratio i...

example 3

[0044] The preparation of example 3PbSe nano cubes:

[0045] 1. [Pb(SG) 2 ] 2+ Preparation of:

[0046] will be 5.5×10 -6 mol glutathione (GSH) was dissolved in 11mL of 0.1M NaOH solution except peroxygen, under inert atmosphere, add 2.2×10 -6 mol lead acetate (Pb(Ac) 2 ) solution.

[0047] 2. -Se + Preparation of:

[0048] At room temperature and inert atmosphere, 8.8×10 -6 mol GSH, 2.2×10 -6 mol Na 2 SeO 3 , 8.8×10 -6 mol of coenzyme II (NADPH) and glutathione reductase (GR) (10 U per mole of substrate) were mixed in 3 mL of BR solution at pH 6.8.

[0049] 3. Crystal formation

[0050] After raising the temperature of the solution in step (1) to 80°C, quickly add the freshly prepared solution in step (2) to (1), react at 80°C for 15 minutes, and cool to room temperature to obtain the desired PbSe nanocube .

[0051] At fixed [Pb(SG) 2 ] 2+ with-Se + Under the condition of the solubility product, only change [Pb(SG) in the above steps 2 ] 2+ with-Se + T...

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Abstract

The invention discloses a size-controllable synthesis method for MSe (M equal to Cd, Pb) nanocrystals. By regulating the pH value of a system, the method simulates the optimal conditions of the reduction process of catalyzing sodium selenite (Na2SeO3) in vivo with glutathione reductase and coenzyme II outside cells to obtain low-valent Se, the low-valent Se reacts with glutathione-coordinated M2 plus ([M-(GS)2]2 plus) under the inert atmosphere, and thereby MSe (M equal to Cd, Pb) nanocrystals with good monodispersity, uniform grain size and fluorescence are obtained under the aqueous-phase condition. The method can control the size of the product by regulating the proportion between the Se precursor and the M precursor. The method is simple, and can repetitively prepare a large quantity of MSe (M equal to Cd, Pb) nanocrystals, moreover, because flammable, explosive and toxic metal organic compound is not used, safety is high, and the method can be widely applied to the field of chemical and material science.

Description

technical field [0001] The invention relates to a method for controllably synthesizing MSe (M=Cd, Pb) nano crystals by regulating biochemical reactions, belonging to the fields of biology, chemistry and material science. Background technique [0002] In recent years, II-VI quantum dots have been widely used in biomedical fields such as detection, separation, diagnosis, tracing, and imaging. How to obtain nanomaterials under green and mild conditions while controlling the morphology and performance of nanomaterials is the focus of much attention in this field. Usually, quantum dots required for practical applications are prepared by using extremely dangerous and expensive metal-organic compound raw materials or complicated and difficult-to-control operation methods. [0003] In 1989, Steigerwald reported that Cd(CH 3 ) 2 and (TMS) 2 E (TMS is a trimethylsilyl group; E=S, Se, Te) is mixed in different solvents to prepare CdE, and the reaction has gone through the process o...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B7/14
Inventor 庞代文崔然谷亦平田智全张志凌
Owner WUHAN UNIV
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