Gold nanocluster/carbon dot composite fluorescent nanoparticles and production method and application in tetracycline detection thereof
A technology of composite fluorescence and gold nanoclusters, applied in nano-optics, nanotechnology, nanotechnology and other directions, can solve the problems of poor water solubility of nanocomposite materials, complex preparation methods, etc., to overcome the lack of stability, simple synthesis method and selectivity. Good results
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Embodiment 1
[0018] Example 1: 20 mL of 10 mmol / L chloroauric acid aqueous solution and 30 mL of 10 mmol / L N-acetyl-L-cysteine aqueous solution were mixed uniformly, and 10 mL of 1.5 mol / L glucose aqueous solution was added to the above solution, After mixing evenly, heat in a 700 W microwave oven for 20 min, and redissolve the reaction product in water to obtain a gold nanocluster / carbon dot composite fluorescent nanoparticle solution. The fluorescence emission peak of the gold nanoclusters / carbon dots composite fluorescent nanoparticles is around 535 nm. Under ultraviolet light, when observed with a black background, it presents yellow-green fluorescence with a quantum yield of 16.5% and a fluorescence lifetime of 3.5 µs.
Embodiment 2
[0019] Example 2: 50 mL of 20 mmol / L chloroauric acid aqueous solution and 50 mL of 20 mmol / L N-acetyl-L-cysteine aqueous solution were mixed uniformly, and 20 mL of 3 mol / L glucose aqueous solution was added to the above solution, After mixing evenly, place it in an 800 W microwave oven and heat for 30 min. The reaction product is redissolved in water to obtain a gold nanocluster / carbon dot composite fluorescent nanoparticle solution. The fluorescence emission peak of the gold nanoclusters / carbon dots composite fluorescent nanoparticles is around 540 nm. Under ultraviolet light, when observed with a black background, it presents yellow-green fluorescence with a quantum yield of 15.5% and a fluorescence lifetime of 2.8 μs.
Embodiment 3
[0020] Embodiment 3: Mix 10 mL 5 mmol / L chloroauric acid aqueous solution and 10 mL 5 mmol / L N-acetyl-L-cysteine aqueous solution, add 2 mL 1 mol / L glucose aqueous solution to the above solution, After mixing evenly, heat in a 500 W microwave oven for 10 min, and redissolve the reaction product in water to obtain a gold nanocluster / carbon dot composite fluorescent nanoparticle solution. The fluorescence emission peak of the gold nanoclusters / carbon dots composite fluorescent nanoparticles is around 530 nm. Under ultraviolet light, when observed with a black background, it exhibits yellow-green fluorescence, with a quantum yield of 16.0% and a fluorescence lifetime of 3.1 μs.
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