Method for preparing gold-platinum core-shell nanostructural material
A nanostructure and gold preparation technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of precise control of Pt deposition position without complex structure gold nanoparticles and other issues to achieve the effects of high-efficiency catalytic performance, simple process, good catalytic performance and SERS performance
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Embodiment 1
[0019] Based on temperature control, the in-situ reduction on the surface of hexahedral gold nanoparticles and the precise deposition of Pt on the sharp corners form a gold-platinum core-shell nanostructure covered with Pt on the sharp corners. The following steps are adopted:
[0020] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, the mixture was magnetically stirred for 1.5 h at a stirring speed of 600 rpm. The whole reaction was carried out at 20°C, where mM is the abbreviation of mmol / L.
[0021] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 20°C and continue stirring for 2h;
[0022] (3) Centrifuge and purify the product of step 2) for 3 times, the centrifugal speed is 1400, and the centrifugation time is 10 min. After purification, the precipitate ...
Embodiment 2
[0024] Based on temperature control, in situ reduction on the surface of hexahedral gold nanoparticles and precise deposition of Pt on the edges to form a gold-platinum core-shell nanostructure covered with Pt on the edges, the following steps are adopted:
[0025] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, and the mixture was magnetically stirred for 2 hours at a stirring speed of 400 rpm. The entire reaction was carried out at 25°C.
[0026] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 25°C and continue stirring for 2h;
[0027] (3) The product of step 2) was centrifuged and purified 3 times, the centrifugal speed was 1600 rpm, and the centrifugation time was 5 min. After purification, the precipitate was redispersed in 1 mL of water, and the prod...
Embodiment 3
[0029] Based on temperature control, in situ reduction on the surface of hexahedral gold nanoparticles and precise deposition of Pt on the surface to form a gold-platinum core-shell nanostructure covered with Pt and rough on the surface, the following steps are adopted:
[0030] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, the mixture was magnetically stirred for 1.5 h at a stirring speed of 600 rpm. The entire reaction was carried out at 35°C.
[0031] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 35°C and continue stirring for 2h;
[0032] (3) The product of step 2) was centrifuged and purified 3 times, the centrifugal speed was 1600 rpm, and the centrifugation time was 5 min. After purification, the precipitate was redispersed in 1mL of water, and t...
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