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Preparation method for fluorescence metal nano particles

A technology of metal nanoparticles and fluorescence, which is applied in the field of preparation of fluorescent metal nanoparticles, can solve the problems of weak emission fluorescence intensity, complicated preparation methods, low quantum yield, etc., and achieve improved fluorescence properties, good product dispersibility, and low price Effect

Inactive Publication Date: 2008-05-28
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

Tao Huang and Jie Zheng synthesized fluorescent gold and silver nanoparticles with a tiopronin molecule with a sulfhydryl group and a hydroxyl-terminated polyamide-amine dendrimer, respectively, although the stability of the core was greatly enhanced, Moreover, the quantum efficiency has been significantly improved, but its preparation method is more complicated, and the intensity of emitted fluorescence is still weak, that is, its low quantum yield makes it still limited in practical application; see

Method used

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  • Preparation method for fluorescence metal nano particles
  • Preparation method for fluorescence metal nano particles

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) In a 50ml Erlenmeyer flask, add the CTAB of 1.0g, the n-butanol of 2.0g, the n-octane of 5.0g and 0.5g, the aqueous solution that concentration is 0.01mol / L silver nitrate, obtain metal ion microemulsion ; Add the CTAB of 1.0g in the Erlenmeyer flask of 50ml, the n-butanol of 2.0g, the n-octane of 5.0g and 0.5g, concentration are the aqueous solution of 0.1mol / L sodium borohydride, obtain reducing agent microemulsion; Ultrasonic dispersion of metal ion microemulsion and reducing agent microemulsion, mixed uniformly and transparently;

[0028] (2) Add the reducing agent microemulsion to the metal ion microemulsion at a rate of 10 drops per minute at a rate of 1:1 at a temperature of 10° C. under magnetic stirring at a stirring speed of 500 rpm. After the dropwise addition, 0.19 g of dimercaptohexane was added, and the reaction was continued for 1 hour.

[0029] (3) At room temperature, the mixed solution after the reaction in step (2) was left to stand for 12 hours,...

Embodiment 2

[0031] (1) in the conical flask of 50ml, add the CTAB of 3.0g, the n-butanol of 6.0g, the n-octane of 21g and 1.5g, concentration are the aqueous solution of 0.1mol / L chloroauric acid, obtain metal ion microemulsion ; Add the CTAB of 3.0g in a conical flask of 50ml, the n-butanol of 6.0g, the n-octane of 21g and 1.5g, the aqueous solution that concentration is 0.8mol / L sodium borohydride, obtain reducing agent microemulsion; The metal ion microemulsion and the reducing agent microemulsion are ultrasonically dispersed separately, and the mixing is uniform and transparent;

[0032](2) Add the reducing agent microemulsion into the metal ion microemulsion at a rate of 100 drops per minute at a temperature of 30° C. under magnetic stirring at a stirring speed of 2000 rpm. After the dropwise addition, 0.32 g of dimercaptohexane was added, and the reaction was continued for 4 hours.

[0033] (3) At room temperature, the mixed solution after the reaction in step (2) was left to stand...

Embodiment 3

[0035] (1) in the conical flask of 50ml, add the CTAB of 1.0g, the n-butanol of 6.0g, the n-octane of 5.0g and 0.5g, the aqueous solution that concentration is 0.1mol / L cupric chloride, obtain metal ion Emulsion; in a 50ml conical flask, add 1.0g of CTAB, 6.0g of n-butanol, 5.0g of n-octane and 0.5g, a concentration of 0.1mol / L sodium borohydride in water to obtain a reducing agent microemulsion ; The metal ion microemulsion and the reducing agent microemulsion are ultrasonically dispersed, mixed uniformly and transparent.

[0036] (2) Add the reducing agent microemulsion into the metal ion microemulsion at a rate of 50 drops per minute at a temperature of 20° C. under magnetic stirring at a stirring speed of 1000 rpm. After the dropwise addition, add 0.25g of dimercaptohexane and continue to react for 4 hours

[0037] (3) At room temperature, the mixed solution after the reaction in step (2) was left to stand for 24 hours, so that the suspended matter therein was completely ...

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Abstract

A process for preparing fluorescent metal nano-particles belongs to the process for preparing nano-materials with fluorescent property, which aims to avoid needless and harsh preparing conditions to gain the nanometer metal particles which are modified by dimercapto compounds, emit royal purple fluorescence and provided with high quantum efficiency. The process for preparation is simple in operation, easy in fetching raw materials and low in price. The sequence of the invention includes the step of preparing reversed-phase micromulsion, titrating step and separating step. Gained final products are dispersed in organic solvent of normal hexane, chloroform and octane, and the final products are capable of emitting royal purple fluorescence under the shining of an ultraviolet lamp. The invention has the advantages of simple and safe operation, good repeatability, safe and available raw materials and low price, further, the achieved products are relatively good in dispersiveness, the fluorescent property is greatly modified, the quantum efficiency increases from 10-4 to about 12%, and the stability of the product is high. The invention has a potential application prospect in the respects of optical storage, full-color display and the like.

Description

technical field [0001] The invention belongs to a method for preparing nanometer materials with fluorescent properties, and in particular relates to a method for preparing fluorescent metal nanoparticles modified by dimercapto compounds. Background technique [0002] The core content of nanoscience and technology is to study the peculiar physical properties and mechanism of nanomaterials, and to make use of their characteristics. In recent years, nanomaterials, especially monolayer-protected nanoparticles (Monolayer-protected nanoparticles), have broad applications in light-emitting materials, optoelectronic devices, and photosensitive sensors due to their fluorescence emission properties in the visible light region and high stability. prospect. [0003] Thiol-modified metal nanoparticles with fluorescence emission properties have attracted the attention of theoretical and experimental researchers since they were synthesized by Brust and his assistants in 1994. The fluores...

Claims

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Application Information

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IPC IPC(8): C09K11/08
Inventor 杜桂焕范慧娟刘祖黎夏星姚凯伦孙绪燕
Owner HUAZHONG UNIV OF SCI & TECH
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