Preparation method and application of red fluorescent copper nano-clusters
A technology of copper nanoclusters and red fluorescence is applied in the field of preparation of red fluorescence copper nanoclusters, and achieves the effects of low instrument requirements, large Stocks displacement and short processing time.
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Embodiment 1
[0035] A preparation method of red fluorescent copper nanoclusters, comprising the following steps: mixing 100 μL 50mmol / L copper nitrate solution and 1mL 150mmol / L 2-mercapto-5-benzimidazole sulfonic acid dihydrate sodium salt solution, mixing with 0.1 The pH of the mol / L NaOH solution was adjusted to 5.0, stirred at room temperature for 10 min, and then the reaction mixture was sonicated at a power of 500 W for 10 min to obtain an aqueous solution of red fluorescent copper nanoclusters. The fluorescence emission peak of the red fluorescent copper nanocluster is around 618nm, and when observed with a black background under an ultraviolet lamp, it presents red fluorescence with a quantum yield of 0.04%.
Embodiment 2
[0037] A preparation method of red fluorescent copper nanoclusters, comprising the following steps: mixing and shaking 100 μL 70 mmol / L copper nitrate solution and 500 μL 120 mmol / L 2-mercapto-5-benzimidazole sulfonic acid dihydrate sodium salt solution with 0.1 The pH of the mol / L NaOH solution was adjusted to 5.7, stirred at room temperature for 10 min, and then the reaction mixture was sonicated at a power of 150 W for 20 min to obtain an aqueous solution of red fluorescent copper nanoclusters. The fluorescent emission peak of the red fluorescent copper nanocluster is around 630nm, and when observed with a black background under an ultraviolet lamp, it presents red fluorescent light with a quantum yield of 0.09%.
Embodiment 3
[0039] A preparation method of red fluorescent copper nanoclusters, comprising the following steps: mixing and shaking 100 μL 100 mmol / L copper nitrate solution and 300 μL 100 mmol / L 2-mercapto-5-benzimidazole sulfonic acid dihydrate sodium salt solution with 0.1 The pH of the mol / L NaOH solution was adjusted to 6.3, stirred at room temperature for 10 min, and then the reaction mixture was sonicated at a power of 300 W for 15 min to obtain an aqueous solution of red fluorescent copper nanoclusters. The fluorescence emission peak of the red fluorescent copper nanocluster is around 642nm, and when observed with a black background under an ultraviolet lamp, it presents red fluorescence with a quantum yield of 0.31%.
[0040] Add 100 μL of red fluorescent copper nanocluster aqueous solution and 1 mL of phosphate buffer solution (PBS, pH=6.3 0.03 mol / L) into the UV cuvette and fluorescence cuvette, and measure the UV-visible absorption spectrum and fluorescence excitation and Emiss...
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