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A kind of preparation method of water-dispersible gold nanowire

A gold nanowire, dispersive technology, applied in nanotechnology, nanotechnology, metal processing equipment and other directions, can solve the problems of unfriendly environment, time-consuming, limited application, etc., and achieve the effect of good appearance and environmental friendliness

Active Publication Date: 2021-04-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the few years since the first report, some researchers have used long-chain amide-amine derivatives as layered growth templates to replace oleylamine to prepare water-dispersible gold nanowires. Friendly, time-consuming, and thus not ideal
In addition, there is no literature report on the use of hydrophilic groups such as mercaptopropionic acid to replace hydrophobic oleylamine to prepare ultrathin water-dispersible AuNWs.
[0005] In actual research and application, since most of the one-dimensional gold nanowires are prepared by the oleylamine template method, the oil solubility limits its application in the aqueous phase.
At present, most researched and commercially available ultrathin AuNWs are only soluble in organic solvents, thus limiting their application in tissue engineering and other fields.

Method used

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  • A kind of preparation method of water-dispersible gold nanowire
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  • A kind of preparation method of water-dispersible gold nanowire

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preparation example Construction

[0029] A method for preparing water-dispersible gold nanowires, comprising the steps of:

[0030] 1) The first is the preparation of oil-soluble gold nanowires: gold precursor solution (HAuCl 4 ) with the help of the growth template molecule oleylamine, triisopropylsilane gradually reduced Au + After 24-48 hours, the color of the solution changes from initial yellow to deep red at room temperature, indicating that Au + The -amine complex was completely reduced to oleylamine-modified gold nanowires and dispersed in hexane solution; then purified in ethanol.

[0031] 2) Next is the exchange of surface hydrophilic ligands: under strong alkaline conditions, 3-mercaptopropionic acid, which has a strong affinity with gold atoms, is exchanged with oleylamine, which is hydrophobic on the surface. After purification, the final morphology remains good. , Water-dispersible gold nanowires.

[0032] In step 1), the specific preparation method of oil-soluble gold nanowires is:

[0033] ...

Embodiment 1

[0044] Example 1 Preparation and purification of oil-soluble AuNWs

[0045] a) Weigh 20mg HAuCl 4 ·3H 2 O, dissolved in a 5mL seed bottle containing 6mL oleylamine and 26mL hexane, fully shaken to dissolve, and then filtered with a 0.22μm filter to remove insoluble matter;

[0046] b) Add 8mL triisopropylsilane solution, shake and mix;

[0047] c) Place the strain bottle in a water bath at 25°C, let it stand for 24 hours to react, and obtain the crude product;

[0048] d) Take 2.5 mL of the crude AuNWs solution prepared above, add 5 mL of absolute ethanol, and mix well by pipetting, and the AuNWs can be seen to precipitate out;

[0049] e) Centrifuge at 4000rpm for 5min, remove the supernatant, add 2.5mL hexane to the precipitate to disperse;

[0050] During this process, purification was performed 2-3 times to minimize the presence of gold nanoparticles.

Embodiment 2

[0051] Example 2 Preparation and purification of oil-soluble AuNWs

[0052] a) Weigh 50mg HAuCl 4 ·3H 2 O, dissolved in a 100mL beaker containing 1.8mL oleylamine and 50mL hexane, fully shaken to dissolve, and then filtered with a 0.22μm filter to remove insoluble matter;

[0053] b) Add 2.5mL triisopropylsilane solution, seal it, and mix it evenly with magnetic stirring;

[0054] c) Place the beaker in a water bath at 25°C and let it stand for a reaction for 48 hours to obtain a crude product;

[0055] d) Take 2.5mL of the crude AuNWs solution prepared above, add 7.5mL of absolute ethanol, and mix well by pipetting, and the precipitation of AuNWs can be seen;

[0056] e) Centrifuge at 4000rpm for 5min, remove the supernatant, add 2.5mL hexane to the precipitate to disperse;

[0057] During this process, purification was performed 2-3 times to minimize the presence of gold nanoparticles.

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Abstract

The invention discloses a method for preparing water-dispersible gold nanowires, which belongs to the technical field of nanomaterials. First, oleylamine is used as a stabilizer and a one-dimensional growth template, and triisopropylsilane is used as an efficient gold reducing agent to prepare oleylamine. Surface functionalized oil-soluble gold nanowires with a diameter of about 2nm and an aspect ratio of more than 1000; then replace the surface hydrophobic oleylamine with 3-mercaptopropionic acid or thioglycolic acid-containing molecular reagents that have a strong affinity with gold atoms , and finally prepared gold nanowires with good shape retention and water dispersibility. A method for preparing water-dispersible gold nanowires of the present invention uses a hydrophilic group substitution method to obtain water-dispersible nanowires; at the same time, it is confirmed by SEM results that AuNWs have good morphology and the aspect ratio is basically maintained; at the same time , the preparation method is simple, not only environmentally friendly but also low in cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of water-dispersible gold nanowires. Background technique [0002] Gold nanomaterials such as nanoparticles, nanorods, and nanoclusters are among the most promising nanomaterials for biomedical applications. Due to its high conductivity, easy preparation and modification, diverse nanostructures, and minimal cytotoxicity, it has been widely used in tissue engineering and medical sensor devices. [0003] One-dimensional gold nanowires (AuNWs) have attracted great interest due to their high aspect ratio, unique electrical, optical, and magnetic properties. Due to the large anisotropy and good assembly ability of AuNWs, it has become an important building block for the connection of nanoelectronics and molecular devices. The current preparation methods of AuNWs are mainly based on template-assisted, nanoparticle assembly, surfactant medi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/07B22F1/0547B22F1/0545
Inventor 黄宁平李小佩
Owner SOUTHEAST UNIV