Method for detecting nitrite ions based on gold-silver core-shell nano-particle SERS technology
A technology of nitrite ions and nanoparticles, which is applied in the fields of food safety and material chemistry to achieve the effects of improving detection speed, good enhancement effect and wide detection range
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[0034] (1) Preparation of gold nanoparticles: mix 0.5 mL of 0.1M chloroauric acid and 200.0 mL of deionized water and heat to boiling under magnetic stirring, add 3.0 mL of 1% trisodium citrate, and stir the mixed solution for 30 minutes Until it becomes wine red, gold nanoparticles are successfully synthesized;
[0035] (2) Preparation of gold and silver core-shell nanoparticle solution: add 1% trisodium citrate 8.0mL to the boiling gold nanoparticle solution, add 1mM silver nitrate 34.0mL dropwise at a rate of one drop every 30s, and the solution continues Stir for 30 minutes, with the color changing from wine red to orange; centrifuge at 12000.0 rpm for 8 minutes; dry at room temperature to obtain gold and silver core-shell nanoparticles, add deionized water to dissolve, and set aside; figure 1 As shown, figure 1 Where a is the SEM characterization diagram of the gold-silver core-shell nanoparticles under the condition of 0.5μm; b is the SEM characterization diagram of the gold...
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