Bimetal nano rod of branched gold core/platinum shell structure and preparation method thereof

A bimetallic nano, gold nanorod technology, applied in the coating and other directions, can solve the problems of gold and platinum nanorods that have not been reported, and achieve the effects of improving SERS properties, improving SPR characteristics, and improving poisoning phenomenon.

Inactive Publication Date: 2009-06-10
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the research on gold-platinum bimetallic nanomaterials is mostly limited to spherical nanoparticles. In the research of preparing rod-shaped gold-platinum nanorods using gold nanorods as templates, only polycrystalline gold-platinum nanostructures and epitaxially grown single crystals have been obtained. The preparation of dendritic gold-platinum nanorods has not been reported

Method used

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  • Bimetal nano rod of branched gold core/platinum shell structure and preparation method thereof
  • Bimetal nano rod of branched gold core/platinum shell structure and preparation method thereof
  • Bimetal nano rod of branched gold core/platinum shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First configure the following solutions:

[0047] 0.1M cetyltrimethylammonium bromide (C 19 h 42 N + Br - , hereinafter referred to as CTAB) aqueous solution: Weigh 3.64g of cetyltrimethylammonium bromide (analytical grade) and dissolve it in 100mL of deionized water; before use, it should be placed in a constant temperature water bath at 30°C to completely dissolve it.

[0048] 0.1M ascorbic acid (AA) aqueous solution: Weigh 0.176g of ascorbic acid (analytical pure) and dissolve it in 10mL of deionized water, and prepare temporarily before use.

[0049] 10mM tetrachloroauric acid (HAuCl 4 ·3H 2 O) Aqueous solution: Weigh 0.393g tetrachloroauric acid (analytical pure, domestic) and dissolve it in 100mL deionized water.

[0050] 10mM silver nitrate (AgNO 3 ) aqueous solution: weigh 0.425g of silver nitrate (analytical grade) and dissolve in 250mL of deionized water; store in the dark.

[0051] 2mM Potassium Platinous Chloride (K 2 PtCl 4 ) aqueous solution: Wei...

Embodiment 2

[0067] Get 2mL of the purified gold nanorod solution obtained in step 3 of Example 1 and put it into a test tube, and add 1mL of deionized water, 15.9uL of 10mM ascorbic acid aqueous solution (AA to platinum ion in dose ratio) and 79.6 uL 2mM potassium platinum chloride aqueous solution; mix well and put it in a constant temperature water bath at 30°C. After a few hours, the solution turns from maroon to gray-black, indicating the formation of a platinum shell structure; after 12 hours, the above reaction The solution was centrifuged at 12,000 rpm for 10 minutes; the supernatant was removed, the precipitate was diluted to the original volume with deionized water, and then centrifuged under the same conditions; so 2 to 4 times, the nanorods were separated from the reaction system to obtain gold Porous bimetallic nanorods with core / platinum shell structure. The resulting image with Figure 4 relatively close.

[0068] The molar ratio of ascorbic acid (AA) and potassium platini...

Embodiment 3

[0070] In this example, except that the volume of AA was selected as 79.6 μL (5 times excess of AA), the rest of the steps were the same as in Example 8, and the image of the obtained bimetallic nanorods with a gold core / platinum shell structure was similar to that in Example 2.

[0071] The molar ratio of ascorbic acid (AA) and potassium platinite chloride in the mixed solution described in this embodiment is 5:1; 1.

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Abstract

The invention provides a dendritic gold-core/platinum-shell bimetal nanometer rod and a preparation method thereof. The dendritic gold-core/platinum-shell bimetal nanometer rod comprises a cylindrical gold nanometer-rod core and a porous platinum-shell layer covering the outer surface of the cylindrical gold nanometer-rod core; the diameter of the cylindrical gold nanometer-rod core is 10 to 15 nanometers; the length of the cylindrical gold nanometer-rod core is 55 to 60 nanometers; the thickness of the porous platinum-shell layer is 0.4 to 8 nanometers; and the length of platinum grains covering the outside of a nanometer rod is 2 to 4 nanometers. The preparation method provided by the invention has the advantages of simplicity, flexibility, environmental protection, green chemistry and low energy consumption. In addition, the obtained bimetal nanometer rod with a gold-core/platinum-shell structure has the characteristics of high yield, narrow size distribution, stable structure and adjustable optical properties.

Description

technical field [0001] The invention relates to a gold-platinum bimetallic nanomaterial, in particular to a bimetallic nanorod with a single crystal gold core / dendritic platinum shell structure and a preparation method thereof. The method realizes a dendritic platinum shell structure by controlling the reaction process Epitaxy grows on cylindrical gold core structures. Background technique [0002] Since core-shell bimetallic nanoparticles exhibit superior performance to single-component metal nanoparticles in the fields of optics, magnetism, and catalysis, their preparation and property studies have attracted increasing attention. For example, oxides of calcium (Ca) or magnesium (Mg) wrap ferric oxide (Fe 2 o 3 ) followed by higher sulfur dioxide (SO 2 ) adsorption and hydrogen sulfide (H 2 S) Release activity. FePt / MFe 2 o 4 The magnetic properties of (Fe, Co) core-shell nanoparticles can be controlled by changing the thickness of the shell oxide. In addition, afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24
Inventor 冯莉莉吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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