Gold nanoparticle-molybdenum disulfide-gold ultra-sensitive SERS substrate material and preparation method thereof
A technology of gold nanoparticles and molybdenum disulfide, which is applied in the field of detection, can solve the problems of complex operation, structural design defects, and the inability of SERS substrates to be widely used, and achieve the effects of good stability and simple preparation methods
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Embodiment 1
[0023] Mix 200 μl of 50 mg / ml chloroauric acid solution with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of 1 wt% sodium citrate solution, and heat to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.5g cysteine and dissolve it in 100ml deionized water to obtain solution A. Dissolve 0.5 g of sodium molybdate in 100 ml of deionized water to obtain solution B. Solution A and solution B were mixed and sonicated for 2 hours at a volume ratio of 2:1 to obtain a molybdenum sulfide precursor solution. Take 40-80ml of gold nanoparticle solution, mix it with molybdenum sulfide precursor solution, and conduct a hydrothermal reaction at 200°C for 12 hours. After the reaction, the solution is centrifuged, washed, and dried for 24 hours to obtain a gold nanoparticle-molybdenum sulfide core-shell structure. nanomaterials. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the soluti...
Embodiment 2
[0026] Mix 200 μl of 70 mg / ml chloroauric acid solution with 100 ml of deionized water, heat to boiling, then add dropwise 700 μl of 2wt% sodium citrate solution, and heat to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.7g cysteine and dissolve it in 100ml deionized water to obtain solution A. Take 0.7g of sodium molybdate and dissolve it in 100ml of deionized water to obtain solution B. Solution A and solution B were mixed and ultrasonicated for 2 hours at a volume ratio of 2:1, and 40-80ml of gold nanoparticle solution was added, mixed with the ultrasonic mixture of A and B above, and hydrothermally reacted at 200°C for 12 hours. After the reaction, the solution was centrifuged , cleaning, and drying for 24 hours, the gold nanoparticle-molybdenum sulfide core-shell nanomaterial can be obtained. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the solution is spin-coated on a clean silic...
Embodiment 3
[0029] 200 μl of 80 mg / ml chloroauric acid solution and 100 ml of deionized water were mixed, heated to boiling, then 700 μl of 3 wt% sodium citrate solution was added dropwise, heated to 100° C. for 10 minutes to obtain a gold nanoparticle solution. Take 0.8g cysteine and dissolve it in 100ml deionized water to obtain solution A. Dissolve 0.8g of sodium molybdate in 100ml of deionized water to obtain solution B. Solution A and solution B were mixed and ultrasonicated for 3 hours at a volume ratio of 2:1, and 40-80ml of gold nanoparticle solution was added, mixed with the ultrasonic mixture of A and B above, and hydrothermally reacted at 200°C for 12 hours. After the reaction, the solution was centrifuged , cleaning, and drying for 24 hours, the gold nanoparticle-molybdenum sulfide core-shell nanomaterial can be obtained. Gold nanoparticles-molybdenum disulfide core-shell nanomaterials are dispersed in ethanol, and about 200 μl of the solution is spin-coated on a clean sili...
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