Preparation method of flexible surface enhanced Raman substrate

A Raman substrate, flexible surface technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of uneven signal enhancement effect, easy agglomeration of precious metal particles, large difference in signal intensity, etc. Good consistency and even distribution

Active Publication Date: 2015-08-19
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current preparation methods of flexible surface-enhanced Raman substrates, noble metal nanoparticles and substrates are mostly based on random physical deposition, and it is difficult to deposit a sufficient amount of noble metal particles on the surface of flexible substrates, and noble metal particles are easy to agglomerate and unevenly distributed. As a result, the signal enhancement effect of the flexible surface-enhanced Raman substrate is not uniform, and the signal intensity obtained in different regions varies greatly, which has limitations in the field of quantitative analysis

Method used

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  • Preparation method of flexible surface enhanced Raman substrate
  • Preparation method of flexible surface enhanced Raman substrate
  • Preparation method of flexible surface enhanced Raman substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Preparation of microsphere template

[0055] a. With 2ml of polystyrene (PS) microsphere suspension (purchased from Alfa Aisha Company, the suspension is a suspension formed by dispersing PS microspheres into deionized water, and the mass percent of microspheres in the suspension is 4 %) was added dropwise to 20ml H + Concentration is in the sulfuric acid of 0.1mol / L, add 1ml concentration again and be the sodium dodecylsulfonate aqueous solution of 0.5wt%, by the surface tension of tensio-active agent sodium dodecylsulfonate, microsphere forms on the sulfuric acid surface uniformly Dense single-layer microsphere film; the particle size of the PS microsphere is about 500nm (standard deviation<3%);

[0056] b. Transfer the microsphere film to the surface of the silicon wafer and dry it at 70°C to obtain a template with PS microspheres deposited on the surface; the specific method for transferring the microsphere film to the surface of the silicon wafer is: hold the ...

Embodiment 2

[0067] (1) Preparation of template

[0068] a. 3ml of silica microsphere suspension (purchased from Sigma, the suspension is made by dispersing silica microspheres in ethanol, the mass percentage of microspheres in the suspension is 2%) is added dropwise to 30ml h + Concentration is in the nitric acid of 1mol / L, add 1ml concentration again and be the sodium dodecylsulfonate aqueous solution of 0.5wt%, by the surface tension of surfactant sodium dodecylsulfonate, the microsphere forms uniform compactness on the surface of nitric acid A single-layer microsphere film; the particle diameter of the silica microsphere is about 300nm (standard deviation<3%);

[0069] b. Transfer the microsphere film to the surface of the silicon wafer, and dry it at 75°C to obtain a template with silica microspheres deposited on the surface; the specific method for transferring the microsphere film to the surface of the silicon wafer is: holding the silicon wafer and holding it Place under the micr...

Embodiment 3

[0078] (1) Preparation of microsphere template

[0079] a. 2ml of aluminum oxide microsphere suspension (purchased from Alfa Aesar, the suspension is formed by dispersing aluminum oxide microspheres in deionized water, the mass percentage of the microspheres in the suspension is 1%) by Add dropwise to 40ml H + Add 2 ml of sodium dodecyl sulfate aqueous solution with a concentration of 0.5 wt% to the hydrochloric acid with a concentration of 5 mol / L, and with the help of the surface tension of the surfactant, the microspheres form a uniform and dense single-layer microsphere film on the surface of the hydrochloric acid; The particle size of the aluminum oxide microspheres is about 750nm (standard deviation <3%);

[0080] b. Transfer the microsphere film to the surface of the silicon wafer, and dry it at 85°C to obtain a template with aluminum oxide microspheres deposited on the surface; the specific method for transferring the microsphere film to the surface of the silicon waf...

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Abstract

The invention discloses a preparation method of a flexible surface enhanced Raman substrate. The method comprises the steps of preparing a flexible substrate of a micro-nano structure with a regular appearance, sequentially carrying out surface hydrophilic treatment and silanization treatment on the flexible substrate, then depositing gold-silver nano particles on the surface of the flexible substrate, wherein sufficient gold-silver nano particles can be deposited, and the gold-silver nano particles are uniformly distributed. The prepared flexible surface enhanced Raman substrate is high in detection sensitivity, good in signal consistency and convenient to use; the preparation method is simple in process and easy to operate.

Description

technical field [0001] The invention belongs to the field of Raman detection, and particularly relates to a preparation method of a flexible surface-enhanced Raman substrate. Background technique [0002] In recent years, surface-enhanced Raman spectroscopy, as a trace or ultra-trace analysis and detection method, has received extensive attention in many fields such as public safety, food safety, and environmental testing. This technology is based on precious metals such as gold and silver at micro-nano sizes, which can greatly enhance the Raman spectral signal intensity of the analyte. Surface-enhanced Raman substrates are the prerequisite for obtaining surface-enhanced Raman signals. In order to make surface-enhanced Raman technology a detection method for large-scale applications, the prepared surface-enhanced Raman substrates should have high sensitivity and consistent signals. It has the characteristics of good property, easy preparation and convenient application. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 程凡圣刘禹刘焕明梅军詹浩然王维海
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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