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Adjustable gold nanostructure as well as preparation method and application thereof

A gold nanostructure and nanoseed technology, applied in the field of nanomaterials, can solve problems such as complex processing of hard templates, changing nanostructure growth conditions, etc., to achieve good catalytic activity and mass activity, improved catalytic performance, and good anti-aggregation properties Effect

Inactive Publication Date: 2021-04-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of such a hard template usually requires more complicated processing methods, and it is easy to introduce impurities to change the growth conditions of the nanostructure.

Method used

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  • Adjustable gold nanostructure as well as preparation method and application thereof
  • Adjustable gold nanostructure as well as preparation method and application thereof
  • Adjustable gold nanostructure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Synthesis of 3D gold nanograss and gold nanoislands:

[0048] APTES solutions with concentrations of 0.1mM, 0.01mM, and 0.6μM (pH 5, solvent mixed with ethanol and water) were added to 4ml vials, and the prepared 15nm gold nanoparticles were added thereto. The mixture was left to stand for 1 hour. A growth solution containing 4-mercaptophenylacetic acid (4-MPAA), chloroauric acid, and ascorbic acid was added to each vial under vigorous stirring to induce nanowire growth, wherein The molar ratio is 1:3:3. After 5 min of growth, the reaction was terminated with ethanol. The gold nanostructures obtained under different APTES concentrations are as follows figure 1 shown. figure 1 a obtained the gold nano-island structure, figure 1 b, c obtained gold nanograss structure.

[0049] In addition, gold nanorods, gold nanotriangular sheets and gold nanocubes are used to replace gold nanoparticles to carry out the above steps, and the obtained gold nanograss-like structure is...

Embodiment 2

[0051] Synthesis of 3D Gold Nanotadpole Structures:

[0052] APTES solution (0.1 mM concentration, pH 7, solvent is a mixed solution of ethanol and water) was first mixed with PVA for 10 minutes and then added to a 4 ml vial, and the prepared 40 nm gold nanoparticles were added thereto. The mixture was left to stand for 1 hour. A growth solution containing 4-mercaptophenylacetic acid (4-MPAA), chloroauric acid, and ascorbic acid was added to the vial under vigorous stirring to induce the growth of the nanowires, where moles of 4-mercaptophenylacetic acid, chloroauric acid, and ascorbic acid The ratio is 2:1:1. After 10 min of growth, the reaction was terminated with ethanol.

[0053] The obtained gold nanostructures are as image 3 shown. Gold nano tadpole structures with different numbers of tails can be obtained by changing the action time of APTES and PVA.

Embodiment 3

[0055] Synthesis of three-dimensional pompom-like gold nanosprings:

[0056] The APTES and PVP solutions were fully mixed, wherein the concentration of APTES was 1 μM, the solvent was a mixed solution of ethanol and water, the pH was 8, the concentration of PVP was 0.05M, and the molecular weight of PVP was 40,000. Silica nanoparticles of 20 nm diameter were then added. APTES hydrolyzes and condenses on the silica surface, providing surface amine groups. After 1 hour, gold nanoparticles with a particle size of 40 nm were added to allow the amine-functionalized silica nanoparticles to attach to the surface of the gold nanoparticles. Then add the ligand 4-mercaptophenylacetic acid (4-MPAA), tetrachloroauric acid (HAuCl 4 ) and the growth solution of reducing agent L-ascorbic acid to start the growth of nanowires, wherein the molar ratio of 4-mercaptophenylacetic acid, chloroauric acid and ascorbic acid is 1:1:1. The color of the mixture gradually changed from pink to black in...

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Abstract

The invention discloses an adjustable gold nanostructure and a preparation method and application thereof. The preparation method comprises the following steps of: adding nano seeds into a first solution containing 3-aminopropyltriethoxysilane; and then adding a growth solution containing a ligand, chloroauric acid and a reducing agent to enable gold nanowires to grow on the surfaces of the nano seeds, and terminating the reaction to obtain the adjustable gold nanostructure. According to the preparation method, required raw materials are simple and easy to obtain, the operation process is simple, convenient and safe, a plurality of complex composite nanostructures can be obtained, and a potential catalyst is provided for various catalytic reactions; and the method has high practicability.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and in particular relates to gold nanostructures with different shapes formed based on the types and timings of addition of surfactants, their preparation methods and applications. Background technique [0002] The structure determines the nature, and the nature determines the use. Nanomaterial synthesis is one of the most critical topics in the nanoscience community, as it is the cornerstone of the entire materials research and application. So far, there are mainly two ways to synthesize nanomaterials of various shapes: top-down (decomposition) and bottom-up (growth). The top-down (decomposition) method includes ball milling and etching, etc. Its advantage is that it can easily prepare various exotic three-dimensional structures, and can also prepare porous materials that inherit the original morphology and structure. But the disadvantage is the waste of materials. When large-scale materials are e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00C23C18/44B82Y40/00
CPCB22F9/24C23C18/44B82Y40/00B22F2009/245B22F2301/255B22F1/07
Inventor 陈虹宇王亚雯王伟玉于贝贝
Owner NANJING UNIV OF TECH
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