Method for preparing metal nanomaterial with simulated cell structure

A technology of metal nano and metal nano particles, which is applied in the field of metal nano material preparation, can solve the problems of inability to synthesize nanostructures, damage of nano-metal core morphology, and inability to form cell-like nanostructures. simple effect

Inactive Publication Date: 2012-04-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the high temperature conditions of heating and boiling, the original shape of the nano-metal core is easily destroyed, and the shape change of the optically anisotropic metal nanoparticles will lead to the difficulty that the cell-li

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  • Method for preparing metal nanomaterial with simulated cell structure
  • Method for preparing metal nanomaterial with simulated cell structure
  • Method for preparing metal nanomaterial with simulated cell structure

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[0019] Example 1: Synthesis of gold nanorods that mimic cell structure

[0020] figure 1 It is a schematic diagram of the synthesis mechanism of the preparation method of the cell-like structure metal nano material of the present invention.

[0021] First, on the surface of metal nanoparticles a, the metal ions in the added metal salt solution are reduced by forming a core-shell structure reducing agent to form another metal shell on the surface of the original metal nanoparticles, thereby A binary metal core-shell structure b is formed; then, on the surface of the above-mentioned binary metal core-shell structure, the high-valent metal ions in the subsequently added metal salt solution are reduced to an intermediate low-valence state by a reducing agent that forms a cell-like structure The metal ions; finally, the metal shell is sacrificed by the displacement reaction between the two metals to form a cell-like structure c. Since the nanostructure composed of metal core, cavity an...

Example Embodiment

[0036] Example 2: Synthesis of gold nano-sheets imitating cell structure

[0037] The specific steps of the synthesis process of the cell-like nano-gold sheet in this embodiment are as follows:

[0038] Step 1: Synthesis of gold nanoflake seeds: Dilute 1mL 0.01M chloroauric acid solution and 1mL 0.01M trisodium citrate solution to 40mL ice bath and mix, then add 1mL 0.1M sodium borohydride, at 1000-1500 rpm Stir for 2-4 minutes at a high rotation speed of 1 minute, and let stand for 2-4 hours at 25-30°C.

[0039] Step 2: Mix 225mL of 0.05M CTAB with 1mL of 0.1M KI, 1.25mL of 0.1M ascorbic acid, 1.25mL of 0.1M NaOH, and 6.25mL of 0.01M chloroauric acid solution. Then, from the conical flask containing 225mL of mixed solution Take 22.5mL from C and place it in Erlenmeyer Flask B, then take 2.25mL from Erlenmeyer B to Erlenmeyer Flask A. Finally, add 225uL of seeds to Erlenmeyer Flask A and quickly transfer Erlenmeyer Flask A Pour the solution into Erlenmeyer Flask B, and then immedia...

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Abstract

The invention discloses a method for preparing a metal nanomaterial with a simulated cell structure, which is characterized by comprising the following steps of: reducing metal ions in an external metal salt solution on surfaces of metal nanoparticles by using a reducing agent for forming a core-shell structure to form a binary metal core-shell structure; reducing high-valence metal ions in a subsequently added metal salt solution into middle and low-valence metal ions on the surface of the binary metal core-shell structure by using a reducing agent for forming the simulated cell structure; and sacrificing a metal shell through displacement reaction between two kinds of metal to form a simulated cell metal nanostructure consisting of a metal core, a cavity and metal walls. The severe condition required by the conventional single high-temperature metal displacement reaction is avoided, the shape of the original nanometal core can be completely kept, and the nanometal material of which the inner cavity contains the movable metal core is formed; and the metal nanomaterial can be applied to fields of environment detection, industrial catalysis, biomedicine and the like and is high in universality, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterial preparation, and in particular relates to a liquid-phase preparation method at room temperature of a metal nanomaterial with a cell-like structure. Background technique [0002] According to the British "Nano Today" (Nano Today, 2009, 4, 494) and the European Elsevier Press "Materials Science and Engineering" (Elsvier, Materials Science and Engineering R: 2010, 70, 44), the current preparation of hollow Porous metal nanomaterials mainly adopt metal replacement reaction at high temperature. However, due to the high temperature conditions of heating and boiling, the original shape of the nano-metal core is easily destroyed, and the shape change of the optically anisotropic metal nanoparticles will lead to the difficulty that the cell-like nanostructure cannot be formed. The biggest limitation of the method is that it can only form a nanostructure with a complete inner cavity, and it is i...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 王进郑广超孔令涛徐敬尧刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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