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Method for controllably synthesizing near-infrared Ag2Se nano crystal

A nanocrystal and near-infrared technology, which is applied in the fields of chemistry, materials science and biology, can solve the problems of non-fluorescent properties and large particle size of quantum dots, and achieve the effects of strong operability, stable synthesis process and mild synthesis conditions

Inactive Publication Date: 2012-06-27
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned methods of various metal compound / elemental organic matter routes, although AgNO can already be used 3 Quantum dots are prepared with inorganic compounds such as Se, but usually the prepared quantum dots have large particle size and no fluorescent properties.

Method used

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  • Method for controllably synthesizing near-infrared Ag2Se nano crystal
  • Method for controllably synthesizing near-infrared Ag2Se nano crystal
  • Method for controllably synthesizing near-infrared Ag2Se nano crystal

Examples

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Effect test

example 1

[0026] Example 1 Ag 2 Preparation of Se quantum dots:

[0027] In this example, Ag 2 The preparation of Se quantum dots is used to illustrate the preparation method of the present invention.

[0028] 1. [Ag-Al] + preparation of

[0029] Convert 4.4×10 -6 mol L-alanine (L-Al) was dissolved in 6mL of 0.1M NaOH solution except peroxygen, under inert atmosphere, add 4.4×10 -6 mol silver nitrate solution.

[0030] 2. -Se + Preparation of:

[0031] At room temperature and inert atmosphere, 4.4×10 -6 mol GSH, 1.1×10 -6 mol Na 2 SeO 3 , 1.1×10 -6 mol coenzyme Ⅱ (NADPH) and glutathione reductase (GR) (according to each mole substrate Na 2 SeO 3 Add 8U) and mix in 4 mL of pH 7.5 BR solution.

[0032] 3. Quantum dot generation

[0033]After heating the solution in step (1) to 90°C, quickly add the freshly prepared solution in step (2) to (1), react at 90°C for 10 minutes, and cool to room temperature to obtain the desired Ag 2 Se quantum dots.

[0034] In fixed [Ag-Al] ...

example 2

[0035] Example 2 Ag 2 Preparation of Se quantum dots:

[0036] In this example, Ag 2 The preparation of Se quantum dots is used to illustrate the preparation method of the present invention.

[0037] 1. [Ag-Al] + preparation of

[0038] Convert 4.4×10 -6 mol L-alanine (L-Al) was dissolved in 6mL of 0.1M NaOH solution except peroxygen, under inert atmosphere, add 2.2×10 -6 mol silver nitrate solution.

[0039] 2. -Se + Preparation of:

[0040] At room temperature and inert atmosphere, 3.3×10 -6 mol GSH, 1.1×10 -6 mol Na 2 SeO 3 , 1.1×10 -6 mol coenzyme Ⅱ (NADPH) and glutathione reductase (GR) (according to each mole substrate Na 2 SeO 3 Add 7U) and mix in 4 mL of pH 6.5 BR solution.

[0041] 3. Quantum dot generation

[0042] After heating 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 Ag 2 Se quantum dots.

[0043] In fixed [Ag-Al]...

example 3

[0044] Example 3 Ag 2 Preparation of Se quantum dots:

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Abstract

The invention discloses a method for controllably synthesizing Ag2Se nano crystal. The method comprises the following steps of: obtaining low-valence Se in processes of simulating glutathione reductase in an organism outside cells and reducing sodium selenite (Na2SeO3) by using coenzyme, reacting the low-valence Se and Ag<+> coordinated with alanine in an inert atmosphere, and thus obtaining the Ag2Se nano crystal with good monodispersity, uniform particle size and different fluorescence emission wavelengths under the condition of aqueous phase. In the method, the size and the fluorescence emission wavelength of the product are controlled by controlling the ratio of the Se precursor to the Ag precursor. The method is easy and convenient, can be repeated for preparation, does not require inflammable, explosive and toxic metallic organic compounds, is good in safety, and can be applied in the fields of chemistry and material science more widely.

Description

technical field [0001] The invention relates to a controllable synthesis of Ag by regulating biochemical reactions 2 The invention discloses a method for preparing Se nanocrystals, belonging to the fields of biology, chemistry and material science. Background technique [0002] Since the autofluorescence and absorption of biological blood and tissues are very low in the near-infrared region, near-infrared materials are very important for biological imaging and live detection. In addition, the biocompatibility, toxicity, and small size of near-infrared materials are also important issues in biological applications. While synthesizing nanomaterials under green and mild conditions, controlling the size and performance of nanomaterials is the focus of much attention in this field. The preparation methods of quantum dots usually use dangerous and expensive metal-organic compound raw materials or complicated and difficult-to-control operation methods. The resulting quantum dot ...

Claims

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Application Information

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IPC IPC(8): C12P3/00
Inventor 庞代文崔然谷亦平张志凌
Owner WUHAN UNIV
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