Preparation method of transparent dielectric microsphere flexible film with enhanced Raman scattering light intensity

A technology of enhanced Raman scattering and flexible thin films, applied in the field of spectral detection, can solve the problems of array deposition effects, unfavorable application of direct deposition microsphere preparation methods, difficult to clean microspheres, etc., achieving short preparation time, low price, The effect of simple removal

Active Publication Date: 2020-11-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of direct deposition of microspheres is not conducive to the application on samples with complex surfaces, and the array deposition effect is affected by the material surface
In addition, it is difficult to clean the microspheres attached to the sample surface after the detection is completed, which is also a major problem in the application

Method used

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  • Preparation method of transparent dielectric microsphere flexible film with enhanced Raman scattering light intensity
  • Preparation method of transparent dielectric microsphere flexible film with enhanced Raman scattering light intensity
  • Preparation method of transparent dielectric microsphere flexible film with enhanced Raman scattering light intensity

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation method for a transparent dielectric microsphere flexible film used for strengthening raman scattering spectral intensity, and belongs to the field of spectrum detection. The preparation method comprises the following steps: preparing a transparent dielectric microsphere turbid liquid; dispensing the dielectric microsphere turbid liquid on an inclined glass sheet surface; after a solvent in the turbid liquid on the inclined glass sheet is evaporated, forming a microsphere single-layer densely paved array structure; preparing a polydimethylsiloxane (PDMS) solution; dispensing the uniformly mixed PDMS solution on the glass sheet deposited with the microsphere array, and thinning by equalizing glue; heating the glass sheet covered with the microsphere array and a PDMS liquid-state thin layer and cooling the glass sheet to the room temperature, embedding the microsphere array into a PDMS film and curing the PDMS film; and separating the microsphere filmfrom the glass sheet. The flexible film can be adhered to the surfaces of various samples, so that raman scattering strengthening on a semiconductor material, one-dimensional and two-dimensional nanomaterials and a three-dimensional structural surface material can be realized.

Description

technical field [0001] The invention relates to a transparent dielectric microsphere flexible film for enhancing the intensity of Raman scattering spectrum, belonging to the field of spectrum detection. Background technique [0002] Raman scattering spectroscopy is an important means of material characterization and a method of substance identification. Raman scattering spectroscopy uses the scattering of light by molecules to provide energy level information about molecular vibration and rotation in materials. It is a nondestructive analysis method; at the same time, these energy level information can also be used as fingerprints of substances to identify and Differentiate different kinds of molecules, so it is widely used in the detection fields of physics, chemistry, material science, biomedicine and so on. However, due to the low intensity of Raman scattering, its application as ultra-high sensitive spectral detection is limited. [0003] Currently, the most commonly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 蒋毅坚邢承闫胤洲
Owner BEIJING UNIV OF TECH
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