Sea urchin-shaped hollow gold and silver alloy nano particle and preparation method and application thereof
A gold-silver alloy and nanoparticle technology, which is applied in the interdisciplinary field of nanoscience and biological science, can solve the problems of poor electric field enhancement effect, complicated preparation method, and low detection sensitivity, and achieve uniform appearance, simple process method, and repeatability Good results
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Embodiment 1
[0040] 1) Dissolve 9 mg of silver nitrate in 50 mL of ultrapure water, heat to boiling, then quickly add 1.2 mL of 1% trisodium citrate aqueous solution, keep boiling for 20 minutes, and then cool to room temperature to obtain particle size 20nm silver colloid;
[0041] 2) Dilute 2.4mL to a concentration of 10×10 -3 Add mol / L chloroauric acid solution and 4.3mL ultrapure water into a 25mL glass bottle, then stir at 300 rpm at 15°C, add 0.9mL silver colloid and 2.4mL The concentration is 10×10 -3 mol / L levodopa aqueous solution, after adding the levodopa aqueous solution, continue to stir with a stirring speed of 300 rpm for 1 minute, and then stir with a stirring speed of 100 rpm for 4 minutes to obtain a reaction solution; the reaction solution is centrifuged , the solid product obtained by centrifugation is washed once with formic acid of 500mmol / L and ammonia water with a mass concentration of 25-28%, and then washed twice with ultrapure water to obtain sea urchin-shaped ...
Embodiment 2
[0044] 1) Dissolve 9 mg of silver nitrate in 50 mL of deionized water, heat to boiling, then quickly add 1.2 mL of trisodium citrate aqueous solution with a mass concentration of 1%, keep boiling for 20 minutes, and then cool to room temperature to obtain a particle size of 20nm silver colloid;
[0045] 2) Dilute 2.4mL to a concentration of 10×10 -3 mol / L chloroauric acid solution and 5.1mL of deionized water were added to a 25mL glass bottle, and then stirred at a stirring speed of 200 rpm at 15°C. During the stirring process, 0.9mL of silver colloid and 2.4 Concentration in mL is 10×10 -3 mol / L levodopa aqueous solution, then stirred and reacted for 4 minutes at a stirring speed less than 200 revolutions per minute to obtain a reaction solution; the reaction solution was centrifuged, and the solid product obtained by centrifugation was successively washed with 500 mmol / L formic acid, mass concentration Wash once with 25-28% ammonia water, and then wash twice with ultrapure...
Embodiment 3
[0047] 1) Dissolve 4 mg of silver nitrate in 50 mL of deionized water, heat to boiling, then quickly add 0.6 mL of trisodium citrate aqueous solution with a mass concentration of 1%, keep boiling for 3 minutes, and then cool to room temperature to obtain silver colloid;
[0048] 2) Dilute 2.4mL to a concentration of 10×10 -3 Add mol / L chloroauric acid solution and 4mL deionized water into a 25mL glass bottle, then stir at a stirring speed of 200 rpm at 15°C, add 0.1mL silver colloid and 2.4mL The concentration is 10×10 -3 mol / L levodopa aqueous solution, then stirred and reacted for 4 minutes at a stirring speed less than 200 revolutions per minute to obtain a reaction solution; the reaction solution was centrifuged, and the solid product obtained by centrifugation was successively washed with 500 mmol / L formic acid, mass concentration Wash once with 25-28% ammonia water, and then wash twice with ultrapure water to obtain sea urchin-shaped hollow gold-silver alloy nanoparticl...
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