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Preparation method for monodisperse gold nanoparticle and assembly thereof

A gold nanoparticle and nanoparticle technology, which is applied in the field of preparation of noble metal nanoparticles, can solve the problems of low aggregation degree and pore density, and achieve the effects of low cost, simple process and simple equipment

Inactive Publication Date: 2013-04-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In the above-mentioned prior art, the removal rate of the organic phase is too fast, and the sharply increased oil-water interface energy leads to rapid concentration of nanoparticles in the microemulsion cavity, which makes the nanoparticles agglomerate sharply, and finally obtains a high degree of aggregation and pores. densely packed particle aggregates

Method used

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  • Preparation method for monodisperse gold nanoparticle and assembly thereof
  • Preparation method for monodisperse gold nanoparticle and assembly thereof
  • Preparation method for monodisperse gold nanoparticle and assembly thereof

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preparation example Construction

[0015] The preparation method of the monodisperse gold nanoparticle and assembly thereof of the present invention, its preferred embodiment comprises:

[0016] First, gold nanoparticles were prepared by reflux method: 82.4mgHAuCl 4 4H 2 O mixed with 5.5ml oleylamine with a mass concentration of 80% and 50ml cyclohexane, stirred at room temperature and passed argon for more than 30min, then rapidly raised to 90°C and kept at this temperature for 10h, then gradually cooled to room temperature , and then use ethanol to wash off the unreacted solvent and by-products in the reaction, centrifuge to obtain gold nanoparticles, and disperse the obtained gold nanoparticles into 2ml of cyclohexane;

[0017] Then, the porous gold nanoparticle aggregates were prepared by the oil-water two-phase microemulsion method and the process of slowly volatilizing the organic phase.

[0018] The preparation of the gold nanoparticle aggregates comprises steps:

[0019] First prepare the aqueous sol...

specific Embodiment

[0024] First, oleylamine-protected gold nanoparticles were prepared, and then porous gold nanoparticle aggregates were prepared through the process of oil-water two-phase microemulsion and slow volatilization of the organic phase. The concrete operation steps of this preparation method are as follows:

[0025] Preparation of gold nanoparticles:

[0026] Preparation of gold nanoparticles (about 10.7nm in size) by reflux method: 82.4mg (0.2mmol) HAuCl 4 4H 2 O, 5.5ml (14mmol) of oleylamine (tech.80%, ACROS) and 50ml of cyclohexane were mixed and poured into a 100ml three-necked flask. The system was stirred at room temperature and passed through argon for about 30 min to completely remove the air in the reaction system, then the temperature was rapidly raised to 90° C. and maintained at this temperature for 10 h. After stopping the reaction, the system was gradually cooled to room temperature, the unreacted solvent and by-products in the reaction were washed away with ethanol...

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Abstract

The invention discloses a preparation method for a monodisperse gold nanoparticle and an assembly thereof. The preparation method comprises the following steps of: firstly, preparing the monodisperse gold nanoparticle with a reflux method: mixing 82.4mg of HAuCl4.4H2O, 5.5ml of oleylamine with the mass concentration of 80% and 50ml of cyclohexane, stirring and introducing argon in for more than 30 minutes at the room temperature, then quickly raising temperature to 90DEG C, keeping for 10 hours at the temperature, gradually cooling to the room temperature, then, washing away solvent which does not react in the solution and byproducts in the reaction by ethanol, and carrying out centrifugation to obtain the gold nanoparticle; dispersing the obtained gold nanoparticle into 2ml of cyclohexane; and then, preparing a porous gold nanoparticle aggregate with an oil-water two-phase micro-emulsion method in a process of slowly volatilizing an organic phase. The preparation method has the advantages of simple technology, low cost, simple equipment and high sensitivity and can be applied to the preparation of other functional nanoparticle aggregates.

Description

technical field [0001] The invention relates to a preparation technology of noble metal nanoparticles, in particular to a preparation method of monodisperse gold nanoparticles and an assembly thereof. Background technique [0002] Noble metal materials (Au, Ag, Cu) are multifunctional materials and are widely used in many fields such as: bioengineering, biochemistry, pharmaceutical transportation, catalytic degradation, surface-enhanced Raman scattering (SERS), etc. Since SERS can realize the rapid and ultrasensitive detection of organic single molecules, noble metal materials are of great significance for the trace detection of organic compounds. [0003] In the prior art, many studies have focused on the self-assembled structure of noble metal nanoparticles, because there are a large number of "hot spots" in the structure, and usually exhibit unique physicochemical properties such as optical, electrical, and optoelectronic properties. Such as three-dimensional close-packe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 刘艳颜张云霞李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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