Method for preparing silica/silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way
A technology of silica and shell structure, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of difficulty in adjusting the absorption peak of core-shell structure, easy aggregation of particles, complicated preparation methods, etc., and achieve enhanced Raman scattering , Catalyze chemical reactions, enhance the effect of dye luminescence
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Embodiment 1
[0020] Add 0.1 g of silica spheres with a diameter of 300 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 1 gram of PVP to 220 milliliters of water and stir to dissolve, add 0.5 milliliters of 1 mol / liter silver nitrate aqueous solution, prepare 3 parts of this solution, add 0.2 milliliters and 0.4 milliliters of silica ball solutions with small silver particles on the surface, respectively, 0.8 milliliters, then add 0.2 milliliters of formaldehyde, ...
Embodiment 2
[0026] Add 0.1 g of silica spheres with a diameter of 1000 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 1 g of PVP to 220 ml of water and stir to dissolve, add 0.5 ml of 1 mol / L silver nitrate aqueous solution, and prepare 3 equal parts of this solution. Add 0.2 milliliters, 0.4 milliliters, and 0.8 milliliters of silica sphere solutions with small silver particles on the surface, then add 0.2 milliliters of formaldehyde and 0.4 milliliters of amm...
Embodiment 3
[0028] Add 0.1 g of silica spheres with a diameter of 300 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 0.5 g of PVP to 220 ml of water and stir to dissolve, add 0.5 ml of 1 mol / L silver nitrate aqueous solution, and prepare 3 equal parts of this solution. Add 0.2 milliliters, 0.4 milliliters, and 0.8 milliliters of silica sphere solutions with small silver particles on the surface, then add 0.2 milliliters of formaldehyde and 0.4 milliliters of am...
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