A kind of preparation method of silver nanocluster
A technology of silver nanoclusters and silicon nanowires, which is applied in Raman scattering, material excitation analysis, etc., and can solve problems such as unfavorable silver nanocluster applications
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Embodiment 1
[0029] 20 μL of 1.5 mM AgNO 3 The aqueous solution was mixed with 50 μL of 100 μM DNA (5’-AATTCCCCCCCCCCCCCTTAA-3’) in 20 mM PB7.4 buffer, 110 μL of 20 mM PB7.0 buffer was added, shaken vigorously for 30 s, and placed in ice water for 15 min. The 20mM PB7.0 buffer is a chloride ion-free phosphate buffer at pH 7.0; the PB7.4 buffer is a chloride ion-free phosphate buffer at pH 7.4.
[0030] The silicon nanowire array was placed in a 4% HF solution for 30 min, washed with deoxygenated water, and ultrasonicated to obtain a suspension of silicon nanowires with surface silicon-hydrogen bonds at 4 μg / mL. Add 20 μL of this suspension immediately to the above AgNO 3 and DNA mixture, shake vigorously for 30s, place in a refrigerator at 4°C for 10 hours, take the supernatant, and obtain silver nanoclusters with an emission wavelength of 570 nm. Luminescence spectra of the obtained silver nanoclusters figure 1 and TEM figure 2 shown.
[0031] The preparation method of the silicon n...
Embodiment 2
[0035] Dissolve 96 μL of 1.5 mM AgNO 3 The aqueous solution was mixed with 90 μL of 100 μM DNA (5’-CCCACCACCCCTCCCA-3’) in 20 mM PB7.4 buffer, 34 μL of 20 mM PB7.0 buffer was added, shaken vigorously for 1 min, and placed in ice water for 30 min.
[0036] The silicon nanowire array was placed in a 2% HF solution for 40 min, washed with deoxygenated water, and ultrasonicated to obtain a suspension of silicon nanowires with silicon-hydrogen bonds on the surface at 4 μg / mL. Add 20 μL of this suspension immediately to the above AgNO 3 and DNA mixture, shake vigorously for 1 min, place in a 4°C refrigerator for 5 hours, take the supernatant, and obtain silver nanoclusters with emission wavelengths of 625 nm and 823 nm. Luminescence spectra of the obtained silver nanoclusters Figure 4 with 5 shown.
[0037] Preparation method of silicon nanowire array: Take n(100) silicon wafers of different sizes, perform ultrasonic cleaning with anhydrous acetone, absolute ethanol, and distil...
Embodiment 3
[0039]Dissolve 36 μL of 1.5 mM AgNO 3 The aqueous solution was mixed with 90 μL of 100 μM DNA (5’-CCCCCCCCCCCC-3’) in 20 mM PB7.4 buffer, 34 μL of 20 mM PB7.0 buffer was added, shaken vigorously for 2 min, and placed in ice water for 10 min.
[0040] The silicon nanowire array was placed in 8% HF solution for 10 min, washed with deoxygenated water, and ultrasonicated to obtain a suspension of silicon nanowires with silicon-hydrogen bonds on the surface at 4 μg / mL. 20 μL of this suspension was immediately added to the above-mentioned AgNO3 and DNA mixture, shaken vigorously for 3 minutes, placed in a refrigerator at 4°C for 8 hours, and the supernatant was taken to obtain silver nanoclusters with an emission wavelength of 630 nm. result with figure 2 resemblance.
[0041] Preparation method of silicon nanowire array: Take n(100) silicon wafers of different sizes, ultrasonically clean them with 50% acetone, 60% ethanol, and distilled water for 15 minutes in sequence, and plac...
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