CN1876290A - Aqueous phase synthesis method for preparing nanometer gold grains - Google Patents
Aqueous phase synthesis method for preparing nanometer gold grains Download PDFInfo
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- CN1876290A CN1876290A CN 200610052129 CN200610052129A CN1876290A CN 1876290 A CN1876290 A CN 1876290A CN 200610052129 CN200610052129 CN 200610052129 CN 200610052129 A CN200610052129 A CN 200610052129A CN 1876290 A CN1876290 A CN 1876290A
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Abstract
The invention discloses a process of preparing nanometer gold grains in aqueous phase, comprising following steps: (1) alkalizing acyclic compound to acrylate compounds, preparing aqueous solution; (2) stirring and boiling chlorauric acid solution, adding it into acrylate compound solution, heating and stirring continuously for 15-25 minutes and getting nanometer gold size solution; the adding amount proportion between said acrylate compound and chlorauric acid by mole is 5-100: 1. The invention employs acrylate compound as reducer and stabilizer, the preparation is preceded in boiling aqueous phase, and the grain size of prepared nanometer grain is 10 to 100nm.
Description
Technical field
The present invention relates to a kind of preparation method of nano Au particle, specifically, relate to a kind of nanometer gold grains in aqueous phase.
Background technology
Nano Au particle makes it have a wide range of applications in catalysis, optics, electricity and biotechnology field owing to having the characteristics such as small-size effect, skin effect and quantum size effect that big specific area, high surface energy, high surface-active show.Because the specific physical chemical property that nano Au particle shows depends on particle size, shape strongly; the character of interparticle distance and the organic ligand shell that shields, thereby controlled synthetic dispersed nano gold particle with definite shape, size and part seems particularly important.
The preparation method of nano Au particle mainly contains two kinds of approach at present: physical method and chemical method.Physical method commonly used has mechanical ball-milling method, physical vaporous deposition, metallo-organic compound steam synthetic method etc.But owing to physical method equipment is had relatively high expectations, and the particle size distribution broad that obtains, and chemical method is easy and simple to handle, particle size shape controllability is better, so have more broad applicability.At present, the chemical preparation process of nano Au particle mainly contains following several: solution reduction method (comprising two phase process and homogeneous phase method), plant golden growth method, template (tree-shaped polymeric method and star-type polymer method) etc.
Wherein the homogeneous phase legal system is equipped with nano Au particle because of its novelty and ease-to-operate, extremely both at home and abroad scientific research personnel's attention.The homogeneous phase method can obtain the different nano Au particle of performance by selecting different reducing agents, and it is free more to make part select, can make the nano Au particle that has various reactive groups as required, it is participated in various chemical reactions as a kind of function monomer, for the preparation of nm of gold and function compound thereof is laid a good foundation.
Nano Au particle homogeneous phase solution preparation method need add reducing agent and stabilizing agent respectively both at home and abroad at present, and the particle degree of purity that makes is not high, and the purification process complexity brings difficulty for next step application of nano Au particle.
Summary of the invention
The invention provides a kind of with the acrylates compounds simultaneously as reducing agent and stabilizing agent, the preparation surface is coated with the nanometer gold grains in aqueous phase of two keys.
A kind of preparation nanometer gold grains in aqueous phase may further comprise the steps:
1. the acrylic compounds alkalization is the acrylates compounds, and is made into the aqueous solution.
2. get chlorauric acid solution, stir, boil, the acrylates compounds aqueous solution of disposable then adding step in 1. continues to add thermal agitation 15～25min, obtains gold colloidal nanaparticles; The addition of described acrylates compounds and gold chloride is 5～100: 1 with molar ratio computing.
Described acrylic compounds is the unsaturated monomer compound that contains acrylic acid structure that the 2-position replaces.
Described acrylic compounds is preferably a kind of in acrylic acid, 2-methacrylic acid, itaconic acid, the itaconic acid monoesters.
Advantage of the present invention is: acrylates is simultaneously as reducing agent and stabilizing agent, and the nano Au particle that obtains is comparatively pure, and the surface has two keys and is easy to next step application; Preparation process is boiled under the condition at water and is carried out, and technology is simple, and the nano Au particle granularity is 10～100nm, and gold particle is less, the difficult precipitation.
The inventive method coats based on the anionic bilayer of propylene acid group, by Coulomb repulsion effect and steric effect nano Au particle is played stabilization.The propylene acid radical anion is coated on the particle skin with double-deck form, and the particle outermost layer is electronegativity, can be soluble in water, avoided reunion by the Coulomb repulsion effect between the particle; On the other hand, because this double-decker, the propylene acid radical anion also plays certain steric hindrance, and interparticle distance was bigger when particle was close mutually, the difficult reunion.
Description of drawings
Fig. 1 is an acrylates compounds bilayer clad nano gold particle model schematic diagram.
Fig. 2 is the nano Au particle transmission electron microscope photo that the Sodium methacrylate for preparing of the present invention coats, and the average grain diameter of gold particle is 16nm.
Fig. 3 is that the nano Au particle UV, visible light that the Sodium methacrylate for preparing of the present invention coats absorbs spectrogram, and maximum absorption band is 537nm.
Fig. 4 is the nano Au particle size distribution plot that Sodium methacrylate coats.
Specific implementation method
Embodiment 1:
1) is Sodium methacrylate with methacrylic acid with the NaOH alkalization, and is made into the aqueous solution of 80mM.
2) get 10ml HAuCl
4(1mM) aqueous solution boils about 10min, disposable then adding 5ml Sodium methacrylate (80mM) aqueous solution.Continue heating 15min, obtain clarifying pink nm of gold sol solution, the average grain diameter of nano Au particle is 16nm.
Embodiment 2:
1) is PAA with acrylic acid with the NaOH alkalization, and is made into the aqueous solution of 80mM.
2) get 10ml HAuCl
4(1mM) aqueous solution boils about 10min, disposable then adding 5ml PAA (80mM) aqueous solution.Continue heating 15min, obtain clarifying pink nm of gold sol solution, the average grain diameter of nano Au particle is 25nm.
Embodiment 3:
1) is itaconic acid dodecyl monoester sodium salt with itaconic acid dodecyl monoesters with the KOH alkalization, and is made into the aqueous solution of 80mM.
2) get 10ml HAuCl
4(1mM) aqueous solution boils about 10min, disposable then adding 5ml dodecyl monoester sodium salt (80mM) aqueous solution.Continue heating 15min, obtain clarifying pink nm of gold sol solution, the average grain diameter of nano Au particle is 35nm.
Claims (3)
1. one kind prepares nanometer gold grains in aqueous phase, may further comprise the steps:
1. the acrylic compounds alkalization is the acrylates compounds, and is made into the aqueous solution;
2. get chlorauric acid solution, stir, boil, the acrylates compounds aqueous solution of disposable then adding step in 1. continues to add thermal agitation 15～25min, obtains gold colloidal nanaparticles; The addition of described acrylates compounds and gold chloride is 5～100: 1 with molar ratio computing.
2. preparation nanometer gold grains in aqueous phase according to claim 1 is characterized in that: described acrylic compounds is the unsaturated monomer compound that contains acrylic acid structure that the 2-position replaces.
3. preparation nanometer gold grains in aqueous phase according to claim 2 is characterized in that: described acrylic compounds is a kind of in acrylic acid, 2-methacrylic acid, itaconic acid, the itaconic acid monoesters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610052129 CN1876290A (en) | 2006-06-23 | 2006-06-23 | Aqueous phase synthesis method for preparing nanometer gold grains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610052129 CN1876290A (en) | 2006-06-23 | 2006-06-23 | Aqueous phase synthesis method for preparing nanometer gold grains |
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| CN1876290A true CN1876290A (en) | 2006-12-13 |
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Family Applications (1)
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| CN 200610052129 Pending CN1876290A (en) | 2006-06-23 | 2006-06-23 | Aqueous phase synthesis method for preparing nanometer gold grains |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266946A (en) * | 2011-07-27 | 2011-12-07 | 厦门大学 | Method for preparing nano-golden particle |
| CN110132953A (en) * | 2019-05-20 | 2019-08-16 | 齐鲁工业大学 | A kind of gold nanoparticle and its preparation method and application of asparatate modification |
-
2006
- 2006-06-23 CN CN 200610052129 patent/CN1876290A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266946A (en) * | 2011-07-27 | 2011-12-07 | 厦门大学 | Method for preparing nano-golden particle |
| CN110132953A (en) * | 2019-05-20 | 2019-08-16 | 齐鲁工业大学 | A kind of gold nanoparticle and its preparation method and application of asparatate modification |
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