A green fluorescent silver nanocluster and its preparation method and application
A technology of silver nanoclusters and green fluorescence, applied in nanotechnology, fluorescence/phosphorescence, chemical instruments and methods, etc., to achieve high sensitivity, small size, and accurate detection results
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Embodiment 1
[0014] Example 1: 1 mL of 2 mmol / L silver nitrate solution and 1 mL of 0.05 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously for 12 h with a magnetic stirrer. Then, the reaction mixture was centrifuged at 10,000 rpm for 10 min, and the supernatant was collected to obtain fluorescent silver nanoclusters. The fluorescence emission peak of the silver nanocluster is around 480 nm, and when observed with a black background under an ultraviolet lamp, it presents green fluorescence with a quantum yield of 4.2%.
Embodiment 2
[0015] Example 2: 1 mL of 8 mmol / L silver nitrate solution and 5 mL of 0.25 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously for 48 h with a magnetic stirrer. Then, the reaction mixture was centrifuged at 10,000 rpm for 10 min, and the supernatant was obtained to obtain fluorescent silver nanoclusters. The fluorescence emission peak of the silver nanocluster is around 480 nm, and when observed with a black background under an ultraviolet lamp, it presents green fluorescence with a quantum yield of 4.5%.
Embodiment 3
[0016] Example 3: 1 mL of 10 mmol / L silver nitrate solution and 8 mL of 0.1 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously with a magnetic stirrer for 24 h, then, the reaction mixture was centrifuged at 10,000 rpm for 10 min to obtain supernatant to obtain fluorescent silver nanocluster solution.
[0017] The silver nanocluster aqueous solution was dropped on a copper grid with a carbon film, and tested after vacuum drying. The average particle size of the fluorescent silver nanoclusters was measured to be 1.8 nm, and the particle size distribution was uniform, such as figure 1 shown. Add the silver nanocluster stock solution (100 μL) and 1 mL of phosphate buffer solution (PBS, pH=7, 0.01 mol / L) into the fluorescence cuvette, and measure its ultraviolet absorption spectrum and fluorescence excitation and emission spectra, such as figure 2 As shown, the maximum fluorescence excitation and emission peaks of the silver nanoclusters are around 3...
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