Method for preparing metal nanomaterial with simulated cell structure

A metal nanometer and cell-like technology, which is applied in the field of room temperature liquid phase preparation of metal nanomaterials, can solve the problems of inability to synthesize nanostructures, damage to the morphology of nanometer metal cores, and inability to form cell-like nanostructures, and achieves a simple preparation method, Widespread effect

Inactive Publication Date: 2014-04-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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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-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 impossible to synthesize a cell-like nanostructure with a mobile metal core in the inner cavity.

Method used

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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

Examples

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Embodiment 1

[0019] Example 1: Synthesis of nano-gold rods imitating cell structure

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

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

Embodiment 2

[0036] Embodiment 2: the synthesis of nano gold sheet of imitation cell structure

[0037] The specific steps of the synthesis process of the nano-gold flakes imitating the cell structure of the present embodiment are as follows:

[0038] Step 1: Synthesis of nano-gold flake 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 speed of 10 minutes, and stand at 25-30°C for 2-4 hours.

[0039] Step 2: Mix 225mL 0.05M CTAB with 1mL 0.1M KI, 1.25mL 0.1M Ascorbic Acid, 1.25mL 0.1M NaOH and 6.25mL 0.01M Chlorauric Acid solution, then, from the Erlenmeyer flask containing 225mL of the mixture Take 22.5mL from C and put it into Erlenmeyer flask B, then take 2.25mL from Erlenmeyer flask B into Erlenmeyer flask A, finally, add 225uL seeds to Erlenmeyer flask A, quickly put the Pour the solution into the Erlenmeyer flask B, then immediate...

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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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Patent Type & Authority Patents(China)
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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