Preparation method for transparent dielectric microsphere flexible film used for strengthening raman scattering spectral intensity
A technology that enhances Raman scattering and spectral intensity, applied in the field of spectral detection, can solve problems such as the influence of array deposition effects, the unfavorable application of direct deposition microsphere preparation methods, and the difficulty of cleaning microspheres, achieving short preparation time, low price, The effect of simple removal
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Embodiment 1
[0049] Mix high-refractive-index glass microspheres with a diameter of 22 μm and water to form a microsphere suspension, and the concentration of the microspheres is about 5×10 3 pcs.μL -1 . Use a dropper to absorb the microsphere suspension, and drop it on the glass substrate with an inclination angle of 20 degrees. At room temperature, when the water in the suspension evaporates naturally, a monolayer array of 22 μm high refractive index glass microspheres densely covered on the surface is obtained. Mix and fully stir the main agent and curing agent of PDMS at a mass ratio of 10:1, and drop-coat it on the microsphere array, then use a homogenizer to rotate at 950 rpm for 60s, and then place it on the heating The platform was heated up to 100°C and kept for 10 minutes until the PDMS was completely solidified and cooled to room temperature naturally. Finally, use tweezers to peel off the film from the glass substrate, cut out an appropriate area of the film and attach it ...
Embodiment 2
[0051] Mix high-refractive index glass microspheres with a diameter of 39.5 μm and ethanol to form a microsphere suspension, and the concentration of the microspheres is about 1×10 3 pcs.μL -1 . Use a dropper to absorb the microsphere suspension, and drop it on the glass substrate with an inclination angle of 30 degrees. At room temperature, when the ethanol in the suspension evaporates naturally, a monolayer array of 39.5 μm high refractive index glass microspheres densely covered on the surface is obtained. Mix and fully stir the main agent and curing agent of PDMS at a mass ratio of 10:1, and drop-coat it on the microsphere array, and then use a homogenizer to rotate at 1000 rpm for 40s, and then place it on the heating The platform was heated up to 100°C, kept for 5 minutes until the PDMS was completely solidified, and then cooled to room temperature naturally. Finally, use tweezers to peel off the film from the glass substrate, cut out an appropriate area of the film...
Embodiment 3
[0053] Mix high-refractive-index glass microspheres with a diameter of 55 μm and isopropanol to form a microsphere suspension, and the concentration of the microspheres is about 5×10 2 pcs.μL -1 . Use a dropper to absorb the microsphere suspension, and drop it on the glass substrate with an inclination angle of 30 degrees. At room temperature, when the isopropanol in the suspension evaporates naturally, a monolayer array of 55 μm high refractive index glass microspheres densely covered on the surface is obtained. Mix and fully stir the main agent and curing agent of PDMS at a mass ratio of 10:1, and drop-coat it on the microsphere array, and then use a homogenizer to rotate at 600 rpm for 60s, and then place it on the heating The temperature in the furnace was raised to 100°C, and the temperature was kept for 20 minutes until the PDMS was completely solidified, and then naturally cooled to room temperature. Finally, use tweezers to peel off the film from the glass substrate...
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