A method for phase transfer of noble metal nanoparticles
A nanoparticle and noble metal technology, applied in the field of nanomaterials, can solve problems such as poor phase inversion effect, yield loss, and nanoparticle agglomeration
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Embodiment 1
[0033] Mix 105mg of polyvinylpyrrolidone, 60mg of ascorbic acid, 400mg of potassium bromide and 8mL of deionized water in a 20mL strain bottle, and heat it to 80°C. After 10 minutes, inject 3mL of an aqueous solution containing 57mg of sodium chloropalladate, and keep for 80 ℃ reaction 3h. Aqueous palladium cubes with an average size of 13nm were obtained, such as figure 1 (a) shown.
[0034] After centrifuging and cleaning the aqueous phase palladium cubes with deionized water, disperse them into 30 mL of ethanol, add 18 mL of oleylamine and 12 mL of toluene, and heat to 80°C for 8 hours with magnetic stirring; centrifuge the mixed solution with cyclohexane and ethanol, and finally palladium Nanocubes can be uniformly dispersed in cyclohexane as figure 1 (b) shown.
Embodiment 2
[0036] Mix 105mg of polyvinylpyrrolidone, 60mg of ascorbic acid, 5mg of potassium bromide, 185mg of potassium chloride and 8mL of deionized water in a 20mL seed bottle and heat to 80°C. After 10 minutes, inject 3mL of 57mg sodium chloropalladate solution Aqueous solution, kept at 80 ° C for 3h. Aqueous palladium cubes with an average size of 6 nm were prepared and centrifuged for future use.
[0037] Mix 105 mg of polyvinylpyrrolidone, 100 μL of formaldehyde, 0.2 mL of an aqueous solution containing 6 nm palladium cubes and 8 mL of deionized water in a 20 mL inoculum bottle and heat to 80 ° C. After 10 minutes, inject 3 mL of 20 mg sodium chloropalladate solution Aqueous solution, kept at 60 ° C for 3h. Aqueous nano-palladium octahedrons with an average size of 15.2nm were obtained, such as figure 2 (a) shown.
[0038] The nano-palladium octahedron in the aqueous phase was centrifugally cleaned with deionized water and then dispersed into 20 mL of ethanol. After adding 12 ...
Embodiment 3
[0040] 100mg of polyvinylpyrrolidone, 16mg of platinum acetylacetonate, 10.4mL of benzyl alcohol, 0.1mL of oleylamine and 1.5mL of formaldehyde were mixed and dissolved, then transferred to a 15mL hydrothermal kettle, and heated to 180°C for 15 hours to obtain platinum nanorods.
[0041] The platinum nanorods prepared in the polar solvent were washed by centrifugation with ethanol and then dispersed into 20 mL of ethanol. After adding 18 mL of oleylamine, the mixture was heated to 80° C. and magnetically stirred for 6 h. The mixed solution was cleaned by centrifugation with cyclohexane and ethanol, and finally the platinum nanorods could be uniformly dispersed in cyclohexane, such as image 3 shown.
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