Preparation method of palladium nano crystal

A palladium nano- and single-crystal technology, which is applied in the field of palladium nano-single crystal preparation, can solve the problems of palladium nano-single crystal morphology being single and not conducive to the systematic study of palladium nano-crystals, and achieve the effect of preventing aggregation and precipitation and high yield

Inactive Publication Date: 2010-07-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The palladium nano single crystal morphology prepared by the method provided in the prior art is single, which is unfavorable for systematically studying the relationship between the morphology of palladium nanocrystal and its growth conditions

Method used

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  • Preparation method of palladium nano crystal
  • Preparation method of palladium nano crystal
  • Preparation method of palladium nano crystal

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preparation example Construction

[0036] An embodiment of the present invention provides a method for preparing a palladium nano single crystal, the steps comprising:

[0037] Mixing cetyltrimethylammonium bromide aqueous solution, potassium iodide solution, chloropalladium acid solution and palladium nano cube seed solution to obtain a mixed solution;

[0038] Add ascorbic acid solution to the mixed solution, fully react, and crystallize palladium nano single crystal;

[0039] Palladium nano single crystals are separated from the reacted solution.

[0040] The invention adopts the seed growth method to synthesize polyhedral palladium nano single crystal. According to the present invention, the cetyltrimethylammonium bromide is a commonly used surfactant in the seed growth method, which can stabilize nanocrystals, prevent their aggregation and precipitation, and promote the formation of uniform and regular morphology of nanocrystals to a certain extent. . The concentration of the cetyltrimethylammonium brom...

Embodiment 1

[0052] 10 mmol / L of chloropalladium acid solution is configured as follows:

[0053] 0.1773 g of palladium chloride was dissolved in 10 ml of 0.2 mol / liter hydrochloric acid solution and then diluted to 100 ml.

Embodiment 2

[0055] Stabilize 5 milliliters of 100 mmol / L cetyltrimethylammonium bromide aqueous solution in a water bath at 80 degrees Celsius, then add 25 microliters of 1 mM mol / L potassium iodide solution, half an hour later, add 125 The fresh ascorbic acid solution of the 10 mmol / liter chloropalladium acid solution of preparing in the embodiment 1 of microliter, the palladium nano cube seed solution of 40 microliters and 50 microliters 100 mmol / liter;

[0056] After reacting for 1 hour, the resulting solution was centrifuged, and the precipitate collected was washed with water and dried to obtain a rhombohedral palladium nano single crystal, such as figure 1 As shown, the formed rhombic dodecahedral palladium nano single crystal has the characteristics of high yield and high monodispersity.

[0057] In the presence of 80 degrees Celsius and 25 microliters of 1mM mole / liter potassium iodide, 80 degrees Celsius is a higher temperature for the present invention, which can promote the dep...

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Abstract

The embodiment of the invention discloses a preparation method of palladium nano crystals, comprising the following steps: adding potassium iodide solution in cetyl trimethylammonium bromide water solution to obtain mixed solution; adding palladouschloride acid solution, palladium nano cubic seed solution and ascorbic acid solution respectively into the mixed solution, and reacting fully; and crystallizing out palladium nano crystals from solution after reaction. cetyl trimethylammonium bromide severs as a surfactant, can stabilize and prevent nano crystals from precipitation, and plays a role in promoting the nano crystals to form uniform and neat shape. Ascorbic acid servers as a reducing agent in the reaction process to reduce bivalent palladium in palladouschloride acid solution into nulvalent palladium atom. Potassium iodide can absorb on the surface of the palladium nano crystals so as to influence the shape of the nano crystals. The preparation method in the invention can synthesize nano crystals in a controllable manner to form palladium nano crystals with various shapes, and is favor of researching the relationship between the shape of the palladium nano crystals and growth conditions thereof.

Description

technical field [0001] The invention relates to the technical field of metal nanocrystals, in particular to a method for preparing palladium nanometer single crystals. Background technique [0002] Compared with macroscopic metal materials, metal nanocrystals exhibit many unique properties, which are closely related to the morphology and size of nanocrystals. In order to study these special properties of metal nanocrystals, controllable synthesis methods of metal nanocrystals have attracted extensive attention. Palladium is one of the noble metals, generally known for its high hydrogen storage capacity and high catalytic activity for organic chemical reactions such as Stille, Heck, Suzuki, etc. Therefore, the synthesis of palladium nanocrystals with controllable morphology and size will have important application value in the fields of catalysis, hydrogen storage, and gas sensing. [0003] Among many metal nanostructures, metal nanosingle crystals have attracted extensive ...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/02
Inventor 徐国宝牛文新
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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