Pd@Pt thin layer nano particle and preparing method thereof
A nanoparticle and thin-layer technology, which is applied in the field of Pd@Pt thin-layer nanoparticles and its preparation, can solve the problems of poor epitaxiality of the Pt shell, inability to accurately control the thickness and number of layers of the shell, etc.
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Embodiment 1
[0041] Put 30mg of polyvinylpyrrolidone and 2mL of ethylene glycol in a 25mL single-necked flask and heat it to 160°C; after 10min, inject 1mL of ethylene glycol solution containing 8.9mg of sodium chloropalladate and 16.7μl of hydrochloric acid; then inject 55μl of hydrochloric acid In a flask; keep at 160° C. for 10 minutes, put the beaker into an ice-water bath to terminate the reaction, and prepare Pd icosahedral nanoparticles, which are centrifuged for later use.
[0042] The icosahedral phase of Pd was dispersed in 6 mL of oleylamine and transferred to a single-necked flask; then 2 mL of oleylamine solution dissolved with 2.2 mg of chloroplatinic acid was added, and then the flask was heated to 180 ° C for 3 h. Finally centrifuged to get Pd 二十面体 @Pt thin layer nanoparticles. characterize it, such as figure 1 As shown, clearly see Pd 二十面体 The shape and size distribution of @Pt thin-layer nanoparticles are uniform, with an average diameter of 15.5nm, and the Pt epitaxia...
Embodiment 2
[0044] Mix 105mg of polyvinylpyrrolidone, 60mg of ascorbic acid, 5mg of potassium bromide, 185mg of potassium chloride and 8.0mL of deionized water in a 20mL strain bottle and heat to 80°C. After 10 minutes, inject 3mL of 57mg of sodium chloropalladate The aqueous solution was kept at 80°C for 3h. Cubic nanoparticles of Pd with an average size of 6 nm were prepared and centrifuged for later use.
[0045] Mix 105mg polyvinylpyrrolidone, 100μl formaldehyde, 0.2mL aqueous solution containing 6nm Pd cubes and 8.0mL deionized water in a 20mL seed bottle and heat to 80°C. After 10 minutes, inject 3mL dissolved in 20mg chloropalladium acid Sodium aqueous solution, kept at 60 ° C for 3h. Pd octahedral nanoparticles with an average size of 15.2 nm were prepared and centrifuged for later use.
[0046]Disperse the octahedral phase of Pd in 12mL of oleylamine in a single-necked flask, add 6mL of oleylamine solution dissolved with 5.4mg of chloroplatinic acid, heat the flask to 180°C f...
Embodiment 3
[0048] Mix 105mg of polyvinylpyrrolidone, 60mg of ascorbic acid, 400mg of potassium bromide and 8.0mL of deionized water in a 20mL strain bottle and heat to 80°C. After 10 minutes, inject 3mL of an aqueous solution containing 57mg of sodium chloropalladate and keep for 80 ℃ reaction 3h. Cubic nanoparticles of Pd with an average size of 13 nm were prepared and centrifuged for later use.
[0049] The cube of Pd was phase-transferred and dispersed in 30 mL of oleylamine in a single-necked flask, and 10 mL of oleylamine solution dissolved with 15.5 mg of chloroplatinic acid was added, and the flask was heated to 180 ° C for 3 h. Centrifuge to get Pd 立方体 @Pt thin layer nanoparticles. characterize it, such as image 3 As shown, clearly see Pd 立方体 @Pt thin-layer nanoparticles have uniform morphology and size distribution, with an average diameter of 14nm. The Pt epitaxial layer is 2-3 layers.
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