A method of nanoimprinting to prepare a flexible and transparent surface-enhanced Raman scattering substrate

A surface-enhanced Raman and nanoimprinting technology, which is applied in the direction of surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of not being suitable for mass production, harmful gas emissions, and the need for special personnel to operate, etc., to achieve excellent Reproducible, easy handling, uniform structure results

Inactive Publication Date: 2017-07-18
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

However, these technologies are limited by the disadvantages of expensive instruments, complicated processes, high production costs, special personnel operation, harmful gas emissions, etc., and may not be suitable for commercial mass production.
Therefore, surface-enhanced Raman scattering substrates that can be easily prepared, low-cost, reproducible, large-area and high-sensitivity are still full of challenges.

Method used

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  • A method of nanoimprinting to prepare a flexible and transparent surface-enhanced Raman scattering substrate
  • A method of nanoimprinting to prepare a flexible and transparent surface-enhanced Raman scattering substrate
  • A method of nanoimprinting to prepare a flexible and transparent surface-enhanced Raman scattering substrate

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Embodiment 1

[0029] A method for preparing a flexible transparent surface-enhanced Raman scattering substrate by nanoimprinting includes the following steps:

[0030] 1. Preparation of nano-imprint template:

[0031] Pure aluminum (above 99.99%) is put into a 0.1-0.5 mol / L oxalic acid, sulfuric acid or phosphoric acid solution and a two-step electrochemical anodization method is adopted to prepare an anodic aluminum oxide template with adjustable size. The anode voltage is 20~200V, the temperature is 0~15℃, the first oxidation time is 2~5 hours; after the first anodic oxidation, it is soaked in 6wt% phosphoric acid and 1.8wt% chromic acid mixed solution for 4~8h, The temperature is 50~60℃; then, the second step of oxidation is carried out under the same conditions as the first anodic oxidation, and the oxidation time is 1~10 minutes; after the two steps of oxidation, 5wt% phosphoric acid solution is used to expand the holes at a temperature of 60℃ 30~180s, and then repeatedly rinse with deioni...

Embodiment 2

[0039] 1. The preparation of the nanoimprint template is the same as the first step of Example 1.

[0040] 2. Deposition of precious metal nanoparticles is the same as the second step of Example 1.

[0041] 3. Imprinting:

[0042] 1) Place an IPS plastic sheet (manufactured by OBDUCAT) and a porous alumina template deposited with gold nanoparticles on the sample stage, and then heat to 155°C after vacuuming; 2) Gradually pressurize to 40Bar and keep it for 5-10min 3) Reduce the pressure to 10~30Bar and keep it for 10~60S; 4) Increase the pressure to 40Bar again and keep it for 5~10min; 5) After cooling, reduce pressure. Such as image 3 Shown.

[0043] 4. Demoulding:

[0044] After the imprinting is completed, use sodium hydroxide (or potassium hydroxide) solution to remove the porous alumina and aluminum base, and then repeatedly rinse and dry with deionized water to obtain a flexible and transparent surface-reinforced Raman substrate, such as Figure 4 Shown.

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Abstract

The invention discloses a preparation method of a flexible transparent surface-enhanced Raman scattering substrate. The method combines a porous alumina template and a nano-imprinting technology, and comprises the following steps: first, the porous alumina template is prepared by using an anodic oxidation method; then, noble metal nanoparticles are deposited on the porous alumina template; finally, a nanostructure of the porous alumina template and the noble metal nanoparticles are transferred onto a polymer film by using the nano-imprinting technology, so as to obtain the flexible transparent surface-enhanced Raman scattering substrate. The flexible transparent surface-enhanced Raman scattering substrate has excellent transparency, flexibility, uniformity and high sensitivity, can be applied to the in-situ detection of pesticide residues on the surfaces of fruits and vegetables, the in-situ detection of contaminants in aqueous solution, the real-time detection of microorganisms, rapid on-site analysis of chemical reactions and other fields. The flexible transparent surface-enhanced Raman scattering substrate is lightweight, foldable, portable, easy to handle. The preparation method is simple in process, low in cost and suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to the field of optical devices, in particular to a method for preparing a flexible and transparent surface-enhanced Raman scattering substrate by combining porous alumina templates and nanoimprint technology. The substrate can be applied to many fields such as micro-nano manufacturing, plasma waveguide, catalysis, and sensing. Background technique [0002] Surface enhanced Raman scattering technology is a powerful analytical chemistry, electrochemistry, catalysis, and medical diagnostic tool that can provide non-destructive, ultra-sensitive characterization, and the detection limit can reach the single-molecule level. A typical surface enhanced Raman scattering substrate needs to include a nano-scale precious metal array, and the surface plasmon polarization resonance generated by it can greatly enhance the Raman signal of the detected substance on or near the substrate. Currently, various micro-nano manufacturing technologies are ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D11/18
Inventor 赵文宁徐智谋刘晓光
Owner HUAZHONG UNIV OF SCI & TECH
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