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Method for preparing gold crystals by adopting surface active agent molecule C18N3

A surfactant and gold preparation technology, applied in the field of preparation of micron and nanometer materials, can solve the problems of low product yield, unclear mechanism, small product size, etc., and achieve easy control of particle size, high product purity, and good dispersibility. Effect

Inactive Publication Date: 2012-07-25
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 requiring special preparation conditions, or the yield of the obtained product is small, and the size of the obtained product is also small and the mechanism is not clear.

Method used

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  • Method for preparing gold crystals by adopting surface active agent molecule C18N3
  • Method for preparing gold crystals by adopting surface active agent molecule C18N3
  • Method for preparing gold crystals by adopting surface active agent molecule C18N3

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1. The preparation method of spherical gold nanoparticle crystal, the steps are as follows:

[0031] (1) Prepare 20ml of KCl aqueous solution (concentration: 0.5M) first, and heat it to 80°C under stirring.

[0032] (2) When the temperature reaches 80° C., add 5 ml of 10 mM C18N3 aqueous solution; add 0.4 ml of 4.5 mM chloroauric acid aqueous solution after one minute.

[0033] (3) Stop the reaction after 40 minutes of reaction. The product was put into a centrifuge and centrifuged at a speed of 8000r / min for 15min, and the gold nanoparticles were settled and washed with double distilled water. So cycle 4 times.

[0034] (4) Collect the precipitate obtained after centrifugation and washing with a copper grid covered with Formvorer, and observe the obtained gold nanoparticles with a transmission electron microscope. ; Figure 1(b) is the X-ray powder diffraction pattern (XRD pattern) of the product, from which it can be seen that the particles are dominated ...

Embodiment 2

[0035] The preparation method of the gold micron crystal of embodiment 2. decahedral shape, the steps are as follows:

[0036] (1) Prepare 20ml of KCl aqueous solution (concentration: 0.5M) first, and heat it to 80°C under stirring.

[0037] (2) When the temperature reaches 80° C., add 2 ml of 10 mM C18N3 aqueous solution; add 0.4 ml of 4.5 mM chloroauric acid aqueous solution after one minute.

[0038] (3) Stop the reaction after 60 minutes of reaction. The product was left to stand at room temperature for 72 hours.

[0039] (4) The product is then placed in a centrifuge and centrifuged at a speed of 6000r / min for 15min, and the gold microparticles are settled and washed with double distilled water. So cycle 4 times.

[0040] (5) collect the precipitate obtained after centrifugal washing, observe the obtained decahedron-shaped gold microcrystals with a scanning electron microscope, and the length of each side of the decahedron-shaped gold microcrystals is 2 μm, see Fig. 2 ...

Embodiment 3

[0041] The preparation method of the gold nanocrystal of embodiment 3. decahedral shape, the steps are as follows:

[0042] (1) Prepare 200ml of KCl aqueous solution (concentration: 0.5M), and heat it to 80°C under stirring.

[0043] (2) When the temperature reaches 80° C., add 2 ml of 10 mM C18N3 aqueous solution; add 0.4 ml of 4.5 mM chloroauric acid aqueous solution after one minute.

[0044] (3) Stop the reaction after 60 minutes of reaction.

[0045] (4) The product is then placed in a centrifuge and centrifuged at a speed of 6000r / min for 15min, and the gold nanoparticles are settled down and washed with double distilled water. So cycle 4 times.

[0046] (5) collect the precipitate that obtains after centrifugal washing with the copper net that has been covered with Formvorer, observe the obtained gold nanocrystal of decahedron shape with transmission electron microscope, the side length of each side of the gold nanocrystal of decahedron shape is all 20nm, see image ...

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Abstract

The invention relates to a method for preparing gold crystals from nanometer to micrometer by adopting surface active agent molecule C18N3 as reducing agent and protecting agent. The surface active agent molecule C18N3 is not only adopted as the reducing agent to reduce chloroauric acid and obtain crystal nucleus, but also used as a sort of good protecting agent to facilitate the shape control and the growth of the metal crystals. Compared with the conventional method, the surface active agent molecule C18N3 is adopted in hydrothermal method applied in the invention to prepare the metal crystals, the prepared metal crystals have better shape controllability. By simply adjusting the molar ratio between the surface active agent molecule C18N3 and the chloroauric acid as well as the concentration of chloride in the solution, the metal crystals with different shapes can be prepared, including sphere, decahedron, plane triangle, plane pentagon and plane hexagon and two-dimension sheet shape.

Description

technical field [0001] The invention relates to a method for preparing micron and nanometer materials, in particular to a method for preparing nanometer to micron-sized gold crystals by using the reductive properties of "dendritic" surfactant molecule C18N3 as a protective agent. Background technique [0002] Recently, with the continuous development of electronic technology, precious metal micro- and nano-materials with unique properties and broad potential application prospects in optics, electricity, acoustics, magnetism, and mechanics have attracted extensive attention. In particular, some non-spherical noble metal micro and nano materials, such as rods, dendrites, tubes, flakes, etc., have greatly aroused everyone's interest because of their good catalytic and optical properties. Since the properties of noble metal micro and nanomaterials are largely determined by their shape and size, the synthesis of shape and size controllable noble metal micro and nanomaterials has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/60C30B7/14
Inventor 江龙林官华鲁闻生崔文娟
Owner INST OF CHEM CHINESE ACAD OF SCI
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