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
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[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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