Method for preparing gold nanoparticles

A gold nanoparticle, nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. Uniformity, nano- or micro-morphological differences, etc., to achieve good surface plasmon resonance properties, no toxic side effects, easy preparation and preservation

Inactive Publication Date: 2012-10-03
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most methods obtain nano or micro structures with various shapes and sizes, and the shapes are very different, and even the shapes and sizes of gold nanoparticles are largely uneven, and are often accompanied by problems such as separation difficulties[ Bri?as R P, Hu M H, Qian L P, Lymar E S, Hainfeld J F, Gold Nanoparticle Size Controlled by Polymeric Au(I) Thiolate Precursor Size [J]. J. Am. Chem. Soc. 2008, 130 (3): 975 –982. Huanga K W, Yua C J, Tseng W L. Sensitivity enhancement in the colorimetric detection of lead (II) ion using gallic acid–capped gold nanoparticles: Improving size distribution and minimizing interparticle repulsion [J]. Biosensors and Bioelectronics, 2010, 25 (5): 984–989. Nadagouda M N, Hoag G, Collins J, Varma R S, Green Synthesis of Au Nanostructures at Room Temperature Using Biodegradable Plant Surfactants [J]. Cryst. Growth Des. 2009, 9 (11): 4979 –4983.]
The optical properties of such synthetic gold nanoparticles are usually not obvious, and they can usually only be used as catalysts, etc.

Method used

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  • Method for preparing gold nanoparticles
  • Method for preparing gold nanoparticles
  • Method for preparing gold nanoparticles

Examples

Experimental program
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Embodiment 1

[0020] First, chloroauric acid (HAuCl 4 ·3H 2O) be made into 0.1M / L aqueous solution, take 20mL and 5M / L 2,6-pyridinedicarboxylic acid aqueous solution 20mL mix and stir under the water bath heating condition of 80 ℃, after reaction lasts 15 minutes, the color of solution From the original nearly colorless to pink, the color gradually deepens as time goes by, and finally turns red. After the reaction is stopped, the solution is slowly cooled to room temperature, and the resulting solution is centrifuged at 8000 rpm. Centrifuge at the speed of 10 minutes, discard the supernatant, remove the unreacted reducing agent 2,6-pyridinedicarboxylic acid, and re-disperse the obtained precipitate into ultrapure water with the same volume as the original, and then obtain 2 , 6-pyridinedicarboxylic acid protected gold nanoparticles. The obtained gold nanoparticles were tested for their absorption by ultraviolet-visible spectroscopy (UV-vis) to verify their surface plasmon resonance proper...

Embodiment 2

[0022] First, chloroauric acid (HAuCl 4 ·3H 2 O) be made into 0.1M / L aqueous solution, get 30mL and 5M / L 2,6-pyridinedicarboxylic acid aqueous solution 5mL mix and stir under the water bath heating condition of 50 ℃, after reaction continues 30 minutes, the color of solution From the original nearly colorless to pink, the color gradually deepens as time goes by, and finally turns red. After the reaction is stopped, the solution is slowly cooled to room temperature, and the resulting solution is centrifuged at 6000 rpm. Centrifuge at a speed of 15 minutes, discard the supernatant, and remove the unreacted reducing agent 2,6-pyridinedicarboxylic acid, and then ultrasonically disperse the resulting precipitate into ultrapure water of the same volume as the original to obtain 2 , 6-pyridinedicarboxylic acid protected gold nanoparticles. The obtained gold nanoparticles were tested for their absorption by ultraviolet-visible spectroscopy (UV-vis) to verify their surface plasmon re...

Embodiment 3

[0024] First, chloroauric acid (HAuCl 4 ·3H 2 O) be made into 0.1M / L aqueous solution, take 25mL and 5M / L 2,6-pyridinedicarboxylic acid aqueous solution 15mL mix and stir under the water bath heating condition of 70 ℃, after reaction continues 20 minutes, the color of solution From the original nearly colorless to pink, the color gradually deepens as time goes by, and finally turns red. After the reaction is stopped, the solution is slowly cooled to room temperature, and the resulting solution is centrifuged at 7000 rpm. Centrifuge at a speed of 15 minutes, discard the supernatant, and remove the unreacted reducing agent 2,6-pyridinedicarboxylic acid, and then ultrasonically disperse the resulting precipitate into ultrapure water of the same volume as the original to obtain 2 , 6-pyridinedicarboxylic acid protected gold nanoparticles. The obtained gold nanoparticles were tested for their absorption by ultraviolet-visible spectroscopy (UV-vis) to verify their surface plasmon ...

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Abstract

The invention belongs to the field of a nano material and particularly relates to a method for preparing gold nanoparticles. The method selects 2,6-dipicolinic acid (PDCA) as a reducing agent to reduce chloroauric acid to generate the gold nanoparticles by reaction; and then the 2,6-dipicolinic acid is used as a protecting agent on the surfaces of the gold nanoparticles; and the reaction condition is moderate and the gold nanoparticles are spherical nanoparticles which are mono-dispersed and uniform. The obtained gold nanoparticles are characterized by an ultraviolet-visible light spectrum (UV-vis), a transmission electron microscope (TEM) and x-ray energy spectrum analysis. The result shows that the particles are spherical, are uniform in size, the diameters of the particles are 6-8nm and the dispersion degree of the gold nanoparticles is high. The method for preparing the gold nanoparticles has the advantages of convenience for operation, moderate condition, and high yield, adopts environment-friendly materials, and also can be used for controllably preparing the mono-dispersed gold nanoparticles.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for preparing gold nanoparticles. Background technique [0002] In recent years, noble metal nanoparticles (such as gold and silver nanoparticles) have attracted extensive attention from researchers due to their excellent properties such as optics, catalysis, and biocompatibility. The size, shape and structure control of gold and silver nanoparticles and the corresponding Research on the properties of materials has become a frontier hotspot in materials science and related fields. Among them, gold nanoparticles are a kind of nanomaterials studied earlier, which are generally called colloidal gold in biological research. Its particle size is generally between 1-100 nm. Due to the nature of surface plasmon resonance, it presents different colors with the change of particle size, which is conducive to naked eye observation and has strong color rendering abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
Inventor 高婷苏忠民柴芳罗顺睿赵亮
Owner NORTHEAST NORMAL UNIVERSITY
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