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Method for producing ultra-small water soluble near-infrared Ag2S quantum dots

A water-soluble, quantum dot technology, applied in the direction of chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problems that are not suitable for biological analysis and biological imaging, and achieve the advantages of large-scale application, small size, and promotion of crystallization. The effect of type conversion

Active Publication Date: 2013-12-11
NANKAI UNIV
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  • Description
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Problems solved by technology

But at the same time, due to the toxic heavy metal elements such as cadmium or lead, these quantum dots are not suitable for biological analysis and biological imaging.

Method used

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  • Method for producing ultra-small water soluble near-infrared Ag2S quantum dots

Examples

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Effect test

Embodiment 1

[0020] An ultra-small water-soluble near-infrared Ag 2 The preparation method of S quantum dots is prepared by a one-pot method, and the steps are as follows:

[0021] 1) In a 50 ml round bottom flask, mix 5 ml of bovine serum albumin solution with a concentration of 50 mg / ml and 5 ml of an aqueous solution with a concentration of 10 mmol / l AgNO 3 Mix the aqueous solution evenly, and react at room temperature for 5 minutes under magnetic stirring to obtain a colorless transparent liquid;

[0022] 2) Use 0.5 ml of NaOH aqueous solution with a concentration of 1 mol / L to adjust the pH of the above liquid to 12.0;

[0023] 3) According to the steps 1) and 2) above, prepare three volumes of 10.5 ml liquids and add them to three containers respectively. Add 0.5 ml of liquids with concentrations of 16.7 mmol / L, 25 mmol / L and 100 mmol / L sodium sulfide aqueous solution to adjust the molar ratio of Ag element to S element to be 6:1, 4:1, 2:1. After stirring and reacting for 12 hours...

Embodiment 2

[0026] An ultra-small water-soluble near-infrared Ag 2 The preparation method of S quantum dots adopts a one-pot method, and the steps and methods are basically the same as those in Example 1, except that the chalcogen compound is thioacetamide.

[0027] Get the Ag that 2 milliliters of this embodiment prepares 2 The S quantum dot solution was used as a sample for observing fluorescence and characterizing, and the test results were similar to those in Example 1.

Embodiment 3

[0029] An ultra-small water-soluble near-infrared Ag 2 The preparation method of S quantum dots adopts a one-pot method, and the steps and methods are basically the same as those in Example 1, except that the chalcogen compound is glutathione.

[0030] Get the Ag that 2 milliliters of this embodiment prepares 2 The S quantum dot solution was used as a sample for observing fluorescence and characterizing, and the detection results were similar to those in Example 1.

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Abstract

The invention relates to a method for producing ultra-small water soluble near-infrared Ag2S quantum dots, which adopts the one-pot method for production. The method for producing ultra-small water soluble near-infrared Ag2S quantum dots comprises the following steps of: 1) uniformly mixing a protein water solution with an AgNO3 water solution and carrying out reaction for 5 minutes at the normal temperature under the condition of magnetic stirring; 2) adjusting the pH value of the liquid with a NaOH water solution to 12.0; and 3) adding a chalcogenide water solution with the concentration of 10-100 millimole / l into the liquid and adjusting the mole ratio of the Ag element and the S element to (6-1):1, and reacting for 12 hours under the conditions of stirring and 37 DEG C to produce the ultra-small water soluble near-infrared Ag2S quantum dots of smaller than 2 nanometers. The method has the advantages that the quantum dots produced by the method have the excellent properties of no-toxic heavy metal elements, small size, good water solubility, high luminous efficiency, adjustability in fluorescence spectra within near-inferred areas and the like; and the production method is safe, easy and convenient to operate, has small toxicity and low cost, and is easy to popularize and use in a large scale.

Description

【Technical field】 [0001] The invention relates to the field of preparation of quantum dots, in particular to an ultra-small size water-soluble near-infrared Ag 2 Preparation method of S quantum dots. 【Background technique】 [0002] Quantum dots are semiconductor nanocrystals or microcrystals, spherical substances with a diameter of 1-12 nanometers composed of II-VI, III-V, IV-VI or I-III-VI period elements. Such nanoparticles exhibit different properties from macroscopic substances, including high quantum emission yields, size-tunable emission spectra, and narrow spectral bands. In addition, controlling the size can tune the position of the emission spectrum. The unique properties of quantum dots are based on their own quantum effects. When the particle size reaches the nanometer level, the size effect, quantum confinement effect, macroscopic quantum tunneling effect and surface effect are caused by the size confinement, thus deriving a nanosystem with a common view. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G5/00B82Y40/00C09K11/58
Inventor 严秀平汪勇
Owner NANKAI UNIV
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