Method for hydrothermally synthesizing nano-Au with polyacrylic acid

A technology of polyacrylic acid and hydrothermal synthesis, which is applied in the field of nano-gold, which can solve the problems of wide particle size distribution, difficulty in controlling the size and shape of metal nanoparticles, and achieve the effects of narrow particle size distribution, uniform shape, and low raw material cost

Inactive Publication Date: 2008-07-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size and shape of metal nanoparticles obtained by these methods are not easy to control, and the particle size distribution is wide

Method used

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  • Method for hydrothermally synthesizing nano-Au with polyacrylic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 0.036 g of polyacrylic acid (molecular weight: 25000), dissolve it in 27 mL of water, and stir evenly; add 3 mL of chloroauric acid solution (0.01 M), and stir for 10 min to obtain a reaction precursor solution; pour the reaction precursor solution into polytetrafluoroethylene lined and loaded into an autoclave. After sealing, place it in an oven at 180°C for 4 hours; cool the reaction system to room temperature. The synthesized gold nanoparticles were separated from polyacrylic acid by centrifugation, and washed three times with ethanol. The obtained gold nanoparticles have a particle size of about 250 nm.

Embodiment 2

[0026] Take 0.144g sodium polyacrylate (molecular weight is 100000), dissolve in 28mL water, stir well; add 2mL chloroauric acid solution (0.01 M), stir for 10min, get the reaction precursor solution; pour the reaction precursor solution into polytetrafluoroethylene Vinyl lined and loaded into an autoclave. After sealing, place it in an oven at 140°C for 4 hours; cool the reaction system to room temperature. The synthesized gold nanoparticles were separated from sodium polyacrylate by centrifugation, and washed three times with ethanol. The particle size of the obtained gold nanoparticles is 150nm, and the size of the obtained gold nanosheets is 400nm and the thickness is 30nm.

Embodiment 3

[0028] Take 0.072g of polyacrylic acid (molecular weight: 240000), dissolve it in 29mL of water, and stir evenly; add 1mL of chloroauric acid solution (0.01M), and stir for 10min to obtain a reaction precursor solution; pour the reaction precursor solution into polytetrafluoroethylene lined and loaded into an autoclave. After sealing, place it in an oven at 200°C for 40 minutes; cool the reaction system to room temperature. The synthesized gold nanoparticles were separated from polyacrylic acid by centrifugation, and washed three times with ethanol. The obtained gold nanoparticles have a particle size of 100 nm.

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Abstract

The invention relates to a preparation method of gold-nano by poly-acrylic acid hydrothermal synthesis, relates to a gold-nano, which provides a gold-nano particle or gold-nano piece with form and shape can be changed through changing experimental conditions. The method is simple and applicable, has low cost and easy obtained material and is applicable for large-scale industrialization production. The production process has no pollution to environment, which is a method of gold-nano by poly-acrylic acid hydrothermal synthesis that meets the requirement of advocating 'green chemistry'. Water is added with polymer, stirred to dissolve; after the polymer is completely dissolved, auric chloride acid is added and stirred and before-reaction precursor solution is obtained; the before-reaction precursor solution is poured into polytetrafluoroethylene lining, put into a high pressure vessel and sealed to react; then the reaction device is cooled to room temperature and centrifugated, leading the gold-nano particle and the polymer to be separated; the gold-nano particle is washed with ethanol, and the gold-nano is obtained. The gold-nano generally comprises gold-nano particle or/and nano-glod piece.

Description

technical field [0001] The invention relates to a nano-gold, in particular to a method for synthesizing gold nano-particles and gold nano-sheets by polyacrylic acid hydrothermal method. Background technique [0002] Due to the surface effect, small size effect and macroscopic quantum tunneling effect of gold nanoparticles, it has many unique properties different from bulk gold, such as optical properties, catalytic properties and chemical reactivity, etc., and has broad application prospects in many fields. At present, the preparation methods of nano gold mainly include: redox method, photochemical method, template method, seed gold growth method and electrochemical reduction method. Polyacrylic acid (PAA) is an important class of water-soluble polymers with many excellent physical and chemical properties: 1) high viscosity; 2) good heat resistance; 3) strong hydration; 4) can block trace metal ions; 5) Good mechanical stability; 6) Strong adhesion to protein; 7) Good emuls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 张其清陈欣翁建李思越
Owner XIAMEN UNIV
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