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Palladium nanoparticles and preparation method thereof

A technology of palladium nanoparticles and palladium salts, applied in the field of nanomaterials, can solve the problems of lack of industrial production potential, uncontrollable morphology of palladium nanoparticles, many reaction parameters, etc., and achieves low cost of raw materials, controllable morphology, High catalytic activity

Inactive Publication Date: 2015-04-08
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, palladium nanoparticles are mainly synthesized by the seed growth method proposed by Berhault (J.Phys.Chem.C, 2007, volume 111, page 5919). The seeds are then added to a growth solution containing cetyltrimethylammonium bromide (CTAB) solution, sodium chloropalladate, and ascorbic acid to continue growing to finally obtain palladium nanoparticles. This method requires a regulated reaction There are many parameters and poor controllability; the operation is cumbersome and does not have the potential for industrial production; the shape of the prepared palladium nanoparticles is uncontrollable and the dispersion is poor

Method used

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  • Palladium nanoparticles and preparation method thereof
  • Palladium nanoparticles and preparation method thereof

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Embodiment 1

[0043] A preparation method of palladium nanoparticles, comprising the following steps:

[0044] (1) Prepare K with a concentration of 1mol / L respectively 2 PdCl 4 Aqueous solution, 1mol / L cetyltrimethylammonium bromide aqueous solution and 100mmol / L ascorbic acid aqueous solution;

[0045] (2) Add 0.1mL of K 2 PdCl 4The aqueous solution was mixed with 0.2 mL of cetyltrimethylammonium bromide aqueous solution, and then 4.7 mL of ascorbic acid aqueous solution was added during stirring to obtain a mixed solution, and the mixed solution was stirred and reacted at 30° C. for 5 hours to obtain a reaction solution;

[0046] (3) Centrifuge the reaction solution in step (2) at 1000 RMP for 10 min. After the centrifugation, remove the supernatant to obtain a precipitate, wash the precipitate with water several times, and obtain palladium nanoparticles after washing.

[0047] figure 1 It is the TEM figure of the palladium nanoparticle that embodiment 1 makes, and scale bar is 200n...

Embodiment 2

[0050] A preparation method of palladium nanoparticles, comprising the following steps:

[0051] (1) Prepare Na with a concentration of 1mol / L respectively 2 PdCl 4 aqueous solution, 1mol / L cetyltrimethylammonium chloride aqueous solution containing potassium bromide and 1mol / L formaldehyde solution; wherein, the concentration of Br in the cetyltrimethylammonium chloride aqueous solution containing potassium bromide is 1mol / L L, the concentration of cetyltrimethylammonium chloride is 1mol / L;

[0052] (2) Add 5mL of Na 2 PdCl 4 The aqueous solution was mixed with 10 mL of cetyltrimethylammonium chloride aqueous solution containing potassium bromide, and then 100 mL of formaldehyde aqueous solution was added to obtain a mixed solution during stirring, and the mixed solution was stirred and reacted at 90° C. for 12 hours to obtain a reaction liquid;

[0053] (3) Centrifuge the reaction solution in step (2) at 15000 RMP for 5 min. After the centrifugation, remove the supernata...

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Abstract

The invention discloses palladium nanoparticles which are in the shape of concave cubes, wherein the surfaces of the concave cubes consist of high-index crystal surfaces. The invention further discloses a preparation method of the palladium nanoparticles. The preparation method comprises the following steps: mixing palladium salt with a surfactant, adding a reducer aqueous solution while stirring to obtain a mixed solution, and performing stirring reaction on the mixed solution at 10-90 DEG C for 1-12 hours, wherein the mixed solution contains Br-ions and the molar ratio of the surfactant to the palladium salt is 2 to 1; after the reaction is finished, performing centrifuging, and washing to obtain the palladium nanoparticles. The palladium nanoparticles are prepared by a seed-free one-step method; the preparation process is simple, environment-friendly and mild in reaction condition; the prepared palladium nanoparticles are controllable in shape and relatively good in dispersity.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a palladium nanoparticle and a preparation method thereof. Background technique [0002] In recent years, palladium, as an important platinum group element, has attracted people's widespread interest. Palladium is widely used as a catalyst, and its catalytic performance is relatively outstanding. [0003] At present, palladium nanoparticles are mainly synthesized by the seed growth method proposed by Berhault (J.Phys.Chem.C, 2007, volume 111, page 5919). The seeds are then added to a growth solution containing cetyltrimethylammonium bromide (CTAB) solution, sodium chloropalladate, and ascorbic acid to continue growing to finally obtain palladium nanoparticles. This method requires a regulated reaction There are many parameters and poor controllability; the operation is cumbersome and does not have the potential for industrial production; the morphology of the prepared pall...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24B82Y40/00
Inventor 蔡林涛谢晓滨高冠慧
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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