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Method for preparing nano/micron gold hierarchical structure material

A technique for preparing gold with a hierarchical structure, which is applied in the field of preparing nano/micro-scale gold hierarchical structure materials, can solve the problems of low yield, complicated preparation process, and poor monodispersity, and achieve high yield, simple operation, and stable shape Effect

Inactive Publication Date: 2011-11-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method has the disadvantages of complicated preparation process, low yield and poor monodispersity.

Method used

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  • Method for preparing nano/micron gold hierarchical structure material
  • Method for preparing nano/micron gold hierarchical structure material
  • Method for preparing nano/micron gold hierarchical structure material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, preparation meatball type, the multi-protrusion type on the surface and the spherical gold hierarchical structure material with sheet-like structure on the surface

[0037] (1) Dissolve C18N3 in twice distilled water to prepare a 0.5 mM C18N3 aqueous solution.

[0038] (2) At room temperature, add 30 μ L (or 70 μ L, or 80 μ L) mass concentration of 2% (48 mM) chloroauric acid aqueous solution to 2.45 mL C18N3 aqueous solution, make the concentration of chloroauric acid in the mixed solution be 0.58 Mm (or 1.33 mM, 1.52mM)

[0039] (3) After the above mixed solution was mixed for 30 seconds, 0.25 mL (20 mM) of ascorbic acid aqueous solution was quickly added, shaken gently, and allowed to stand for 1 hour.

[0040] (4) The above product solution was centrifuged at 3000r / min for 5min, the supernatant was removed, and the precipitated product was washed with twice distilled water. So cycle 3 times.

[0041] (5) Drop each sample washed by centrifugation ont...

Embodiment 2

[0042] Embodiment 2, the preparation surface multi-protrusion type gold nanostructure material and the nano gold flower that the surface is sheet-like structure

[0043] (1) Dissolve C18N3 in twice distilled water to prepare a 0.5 mM C18N3 aqueous solution.

[0044] (2) At room temperature, 80 μL of 2% (48 mM) chloroauric acid aqueous solution was added to 2.45 mL of C18N3 aqueous solution, so that the concentration of chloroauric acid in the mixed solution was 1.52 mM.

[0045] (3) After mixing the above mixed solution for 30 seconds, quickly add 0.25 mL (or 0.3 mL, or 0.35 mL) of 20 mM ascorbic acid aqueous solution, shake gently, and let stand for 1 hour.

[0046] (4) The above product solution was centrifuged at 3000r / min for 5min, the supernatant was removed, and the precipitated product was washed with twice distilled water. So cycle 3 times.

[0047] (5) The sample of centrifugation washing is dropped on silicon chip, room temperature is dried, obtains the electron mi...

Embodiment 3

[0049] Embodiment 3, the preparation method of the gold nano single crystal with many protrusions on the surface is as follows:

[0050] (1) Dissolve C18N3 in twice distilled water to prepare a 0.5 mM C18N3 aqueous solution.

[0051] (2) Add 10 μL (or 20 μL, or 30 μL) of 2% (48 mM) chloroauric acid aqueous solution to 2.45 mL of C18N3 aqueous solution at room temperature.

[0052] (3) After mixing the above mixed solution for 30 seconds, quickly add 0.25 (20 mM) ascorbic acid aqueous solution, shake gently, and let stand for 1 hour.

[0053] (4) The above product solution was centrifuged at 6000r / min for 5min, the supernatant was removed, and the precipitated product was washed with double distilled water. So cycle 3 times.

[0054] (5) Drop the centrifuged washed sample onto the silicon wafer and dry it at room temperature. The scanning electron micrograph of the product of adding 20 μ L of chloroauric acid solution is as follows Figure 5 As shown, it can be seen that th...

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Abstract

The invention discloses a method for preparing a gold hierarchical structure material. In the method, the nano / micron gold hierarchical structure material is prepared by reducing chloroauric acid at normal temperature, wherein a 'dendritic' surfactant C18N3 serves as a template and protective agent; and ascorbic acid serves as a reducing agent. Bubbles formed by the surfactant C18N3 serve as the template; and a C18N3 protected stable gold nano hierarchical structure is obtained through reduction by using the ascorbic acid. Compared with the conventional method, the method is simple and low incost; and the hierarchical structure prepared by the method has high monodispersity, controllable appearance and the like. The nano / micron gold hierarchical structures with different appearances can be obtained by simply adjusting the amount of the surfactant, the chloroauric acid and the ascorbic acid, and comprise three-dimensional gold nanostructures such as a gold nanocrystal with a pluralityof protrusions on the surface, nearly spherical hollow nanoparticles, a meatball-shaped structure, a spherical structure with rodlike protrusions on the surface, a nano / micron spherical structure with sheet-like surface and the like.

Description

technical field [0001] The invention relates to a method for preparing a nano / micro-level gold hierarchical structure material. Background technique [0002] In recent years, due to the unique properties and broad potential application prospects of noble metal micro- and nano-materials in optics, electricity, acoustics, magnetism, and mechanics, the synthesis and preparation of micro-nano noble metals has attracted extensive attention. Nano-hierarchical structure is a new type of nano-structure material that has emerged in recent years. Due to the coupling and synergistic effects of multi-level, multi-dimensional, and multi-component, hierarchical structure materials have undoubtedly become the most powerful carrier to meet the requirements of material development. In a broad sense, hierarchical structure materials include polyhedrons with special structures (such as multipods, stars, etc.), two-dimensional and three-dimensional superarrangements of zero-dimensional or one-d...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 江龙贾文峰李津如
Owner INST OF CHEM CHINESE ACAD OF SCI
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