Preparation method of surface reinforced Raman scattering sensing device based on photonic crystal band edge effect
A surface-enhanced Raman and photonic crystal technology, applied in the field of chemical and biological sensing, can solve the problems of poor reproducibility and cumbersome steps, and achieve the effects of good reproducibility, enhanced interaction and improved sensitivity
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Embodiment 1
[0026] 1) Use an amino modification solution containing 3-aminopropyltriethoxysilane (APTES) to monodisperse SiO with a diameter of 262nm 2 The microspheres were modified with amino groups. The volume ratio of APTES and isopropanol in the modification solution was 1:200, and refluxed at 80°C for 3 hours. The suspension was centrifuged and washed with ethanol and purified water respectively to obtain amino-modified SiO 2 Microspheres, dry for later use. Add double-distilled water in the three-necked round bottom flask, add chloroauric acid after being heated to boiling, in the solution, chloroauric acid concentration is 0.28mmol / L, then add sodium citrate, make the mol ratio of chloroauric acid and sodium citrate be 1:5, the stirring reaction was stopped after 45 minutes to obtain a wine-red solution, which was cooled to room temperature, and continued to stir until the color did not change, and was set aside.
[0027] 2) Prepare amino-modified SiO with a concentration of 3% (...
Embodiment 2
[0029] 1) Use an amino modification solution containing 3-aminopropyltriethoxysilane (APTES) to monodisperse SiO with a diameter of 200nm 2 The microspheres were amino-modified, the volume ratio of APTES and isopropanol in the modification solution was 1:500, refluxed at 70°C for 5 hours, the suspension was centrifuged, and washed with ethanol and purified water respectively to obtain amino-modified SiO 2 Microspheres, dry for later use. Add double-distilled water in the three-necked round bottom flask, add chloroauric acid after being heated to boiling, in the solution, chloroauric acid concentration is 0.25mmol / L, then add sodium citrate, make the mol ratio of chloroauric acid and sodium citrate be 1:10, the reaction was stopped after stirring for 45 minutes to obtain a wine-red solution, which was cooled to room temperature and continued to stir until the color did not change, then set aside.
[0030] 2) Prepare amino-modified SiO with a concentration of 3% (w / w) 2 Micros...
Embodiment 3
[0032]1) Use an amino modification solution containing 3-aminopropyltriethoxysilane (APTES) to monodisperse SiO with a diameter of 300nm 2 The microspheres were amino-modified, the volume ratio of APTES and isopropanol in the modification solution was 1:50, refluxed at 70°C for 5 hours, the suspension was centrifuged, and washed with ethanol and purified water respectively to obtain amino-modified SiO 2 Microspheres, dry for later use. Add double-distilled water in the three-necked round bottom flask, add chloroauric acid after being heated to boiling, in the solution, chloroauric acid concentration is 0.25mmol / L, then add sodium citrate, make the mol ratio of chloroauric acid and sodium citrate be 1:1, the reaction was stopped after stirring for 120 minutes, and a wine red solution was obtained. After it was cooled to room temperature, the stirring was continued until the color did not change, and it was ready for use.
[0033] 2) Prepare amino-modified SiO with a concentrat...
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