Preparation method of polymer-protected fluorescent copper nanoclusters
A technology of nano-clusters and polymers, applied in nano-technology, chemical instruments and methods, luminescent materials, etc., can solve the problems of easy oxidation, large size of Cu nanoparticles, and less research on Cu nano-clusters, and achieve stable performance, Inexpensive and mild reaction conditions
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Embodiment 1
[0018] A method for preparing polymer-protected fluorescent copper nanoclusters, comprising the steps of:
[0019] (1) Dissolve 500 μL of polyethyleneimine (PEI) solution with a concentration of 0.1 g / mL and 300 μL of 4-hydroxyethylpiperazineethanesulfonic acid (HEPES) solution with a concentration of 10 mmol / l in 2020 μL of pure water , stir for 5min;
[0020] (2) Add 150 μL of copper nitrate solution with a concentration of 100 mmol / l to the solution in step (1), and stir for 20 min;
[0021] (3) Add 30 μL of formaldehyde to the solution in step (2) under magnetic stirring, and heat at 50° C. for 20 min to obtain a blue solution, which is a polymer-protected fluorescent copper nanocluster. The electron microscope patterns of the polymer-protected fluorescent copper nanoclusters are as follows: figure 1 As shown, the fluorescence spectrum is as figure 2 shown.
Embodiment 2
[0023] A method for preparing polymer-protected fluorescent copper nanoclusters, comprising the steps of:
[0024] (1) 800 μL of chitosan solution with a concentration of 0.1 g / mL and 500 μL of 10 mmol / l 4-hydroxyethylpiperazineethanesulfonic acid (HEPES) solution were dissolved in 1390 μL of pure water and stirred for 20 min;
[0025] (2) Add 300 μL of 100 mmol / l copper nitrate solution to the solution in step (1), and stir for 5 min;
[0026] (3) Add 10 μL of formaldehyde to the solution in step (2) under magnetic stirring, and heat at 70° C. for 50 min to obtain a blue solution, which is a polymer-protected fluorescent copper nanocluster.
Embodiment 3
[0028] A method for preparing polymer-protected fluorescent copper nanoclusters, comprising the steps of:
[0029] (1) Dissolve 300 μL of lysine solution with a concentration of 0.1 g / mL and 600 μL of 4-hydroxyethylpiperazineethanesulfonic acid (HEPES) solution with a concentration of 10 mmol / l in 1980 μL of pure water, and stir for 10 min;
[0030] (2) Add 100 μL of copper nitrate solution with a concentration of 100 mmol / l to the solution in step (1), and stir for 15 min;
[0031] (3) Add 20 μL of formaldehyde to the solution in step (2) under magnetic stirring, and heat at 80° C. for 80 min to obtain a blue solution, which is a polymer-protected fluorescent copper nanocluster.
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