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Preparation method of platinum nanoparticles

A technology of platinum nanoparticles and chloroplatinic acid, which is applied in the field of preparation of platinum nanoparticles, can solve the problems of sodium borohydride inhalation toxicity, high reaction risk factor, and environmental hazards, and achieve high application prospects and commercial value. Inexpensive, easy-to-remove effect

Inactive Publication Date: 2012-07-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, currently, in order to prepare platinum nanoparticles with a particle size below 10nm, most of the literature uses sodium borohydride as a strong reducing agent. The reaction mechanism is to use the strong reducing H produced by sodium borohydride in water to reduce the oxidation state. Platinum has a large reaction risk factor and the raw material is not easy to preserve; moreover, sodium borohydride itself has inhalation toxicity and is very harmful to the environment

Method used

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  • Preparation method of platinum nanoparticles
  • Preparation method of platinum nanoparticles
  • Preparation method of platinum nanoparticles

Examples

Experimental program
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Embodiment 1

[0018] Add 0.8g of glucose and 0.2g of ascorbic acid into 30mL of deionized water, stir for 10min to completely dissolve the glucose and ascorbic acid, then place the above solution in a 60°C water bath, drop in 1mL of 10mM chloroplatinic acid, and react for 15min to obtain platinum nanoparticles Sol. Sampling from it, using a laser particle size analyzer (ZETASIZER 3000HS A ) to test the prepared platinum nanoparticles, the average particle size is 46nm.

Embodiment 2

[0020] Add 0.54g of glucose and 0.132g of ascorbic acid into 30mL of deionized water, stir for 10min to completely dissolve the glucose and ascorbic acid, then place the above solution in a water bath at 80°C, drop in 1mL of 10mM chloroplatinic acid, and react for 5min to obtain platinum nanoparticles Sol. Take a sample from it, use the laser particle size analyzer to test the prepared platinum nanoparticles, the average particle diameter is 4.5nm, use the transmission electron microscope to carry out the morphology characterization of the sample, the obtained TEM picture is shown in figure 1 , it can be seen from the figure that the obtained platinum nanoparticles have good dispersion and an average particle diameter of 4nm, which is consistent with the results measured by the laser particle size analyzer.

Embodiment 3

[0022] Add 0.8g of glucose and 0.2g of ascorbic acid to 30mL of deionized water, stir for 10min to completely dissolve the glucose and ascorbic acid, then place the above solution in a water bath at 90°C, drop in 1mL of 20mM chloroplatinic acid, and react for 4min to obtain platinum nanoparticles Sol. Samples were taken therefrom, and the prepared platinum nanoparticles were tested using a laser particle size analyzer, and the average particle diameter was 35nm.

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Abstract

The invention discloses a preparation method of platinum nanoparticles, which comprises the following steps: dissolving glucose and ascorbic acid in water, wherein the concentration of the ascorbic acid is 0.01-0.2mol / L, and the molar ratio of the glucose to the ascorbic acid is 1-15:1; then, adding chloroplatinic acid in a water bath at 60-90 DEG C and reacting for 3-60 minutes to obtain platinum nanoparticles, wherein the molar ratio of the chloroplatinic acid to the ascorbic acid is 1:25-200; and transferring the obtained platinum nanoparticles into a water bath at 50-55 DEG C, adding the chloroplatinic acid of which the molar weight is 0.3-2 times the molar weight of the chloroplatinic acid added in the first time, and regulating the duration time of the water bath to regulate and control the sizes of the platinum nanoparticles. Platinum nanoparticles which have good dispersibility can be prepared under optimal conditions by adopting the method of the invention, and the average particle diameter of the platinum nanoparticles is less than 10nm; the reagents used are nontoxic and harmless; and the invention has the advantages of mild reaction conditions and low cost and can realize regulation and control of the sizes of the nanoparticles.

Description

technical field [0001] The invention relates to a method for preparing platinum nanoparticles, belonging to the field of nanotechnology. Background technique [0002] Metal nanoparticles have attracted more and more attention because they can be used not only as catalysts, photocatalysts, sensors and magnetic fluids, but also in the fields of optics, electronics and magnetic devices. Due to their novel characteristics, these nanoparticles have high application value in many disciplines such as physics, chemistry, biology, medicine, and material science. [0003] However, most of the preparation methods of metal nanoparticles reported in the literature are heavily dependent on toxic organic reagents, or there is a greater risk in the preparation process. Finding a green and environmentally friendly method for preparing metal nanocolloid particles is a hot research topic now. In particular, currently, in order to prepare platinum nanoparticles with a particle size below 10nm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 赵兴中胡浩陈仁杰卜呈浩
Owner WUHAN UNIV
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