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Polymer based nanometer cone structure SERS substrate and preparation method

A nanocone and polymer technology, which is applied in the field of optical devices, can solve the problems of few research reports on the research and application of the conical porous alumina template, and achieve the effects of low cost and simple preparation process.

Inactive Publication Date: 2017-04-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research and application of tapered porous alumina templates in the field of SERS has rarely been reported.

Method used

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  • Polymer based nanometer cone structure SERS substrate and preparation method
  • Polymer based nanometer cone structure SERS substrate and preparation method
  • Polymer based nanometer cone structure SERS substrate and preparation method

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preparation example Construction

[0036] Such as figure 2 Shown, the present invention provides the preparation method based on polymer nanocone structure SERS substrate, comprises the following steps:

[0037] (1) Preparation of conical porous alumina templates by a multi-step anodic oxidation method;

[0038] (2) Deposit uniform noble metal nanoparticles on the surface of the conical porous alumina template;

[0039] (3) Using the nanoimprint method to replicate the nanocone structure of the conical porous alumina template onto the polymer and transfer the noble metal nanoparticles to the polymer;

[0040] (4) Separating the tapered porous alumina template from the polymer to prepare a polymer-based nanocone structured SERS substrate.

[0041] The conical porous anodized alumina template was prepared by a multi-step anodic oxidation method, and noble metal nanoparticles were deposited on the surface of the nanocone structure, and the nanocone structure on the conical porous alumina template was completely...

no. 1 example

[0042] The first embodiment of the preparation method of the polymer-based nanocone structure SERS substrate provided by the invention comprises the following steps:

[0043] (1) Prepare a conical porous alumina template by a multi-step anodic oxidation method, including the following steps:

[0044] (11) Put the aluminum foil with a mass percentage of more than 99.99% into 0.3mol / L oxalic acid solution for the first step of oxidation, the oxidation voltage is 40V, the oxidation temperature is 3°C, and the first step oxidation time is 4h.

[0045] (12) Soak the aluminum foil subjected to the first step of anodic oxidation in a mixture of 6wt% phosphoric acid and 1.8wt% chromic acid for 12 hours, the temperature of the mixture is 60°C; it is used to remove the oxide layer of the aluminum foil.

[0046] (13) Put the deoxidized aluminum foil into 0.3mol / L oxalic acid solution for the second step of oxidation, the oxidation voltage is 40V, the oxidation temperature is 10°C, and th...

no. 2 example

[0060] The second embodiment of the preparation method of the polymer-based nanocone structure SERS substrate provided by the invention comprises the following steps:

[0061] (1) Prepare a conical porous alumina template by a multi-step anodic oxidation method, which is the same as step (1) in the first embodiment.

[0062] (2) By plasma sputtering, uniform gold nanoparticles are deposited on the surface of the conical porous alumina template. A conical porous alumina template was placed in a vacuum chamber, and after vacuuming, gold nanoparticles were sputtered with a sputtering current of 3 mA and a sputtering time of 2 min to obtain a conical porous alumina template deposited with gold nanoparticles.

[0063] (3) Utilizing the nanoimprint method to replicate the nanocone structure of the conical porous alumina template on the PMMA film and transfer the gold nanoparticles to the PMMA film, including the following steps;

[0064] (31) The PMMA film and the tapered porous al...

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Abstract

The invention discloses a polymer based nanometer cone structure SERS substrate which is prepared from a polymer with a nanometer cone structure and a three-dimensional noble metal nanometer particle array; and noble metal nanometer particles are uniformly inlaid in the polymer nanometer cone structure surface. The SERS substrate has the advantages of excellent transparency, excellent flexibility, excellent uniformity, high sensitivity, light weight, foldable ability, portability and liability in treatment and can be applied to the field of in-situ detection of pesticide residues on the surfaces of vegetables and pollutants in an aqueous solution. The invention also discloses a preparation method of the SERS substrate. The preparation method comprises the following steps: preparing a conical porous alumina template by utilizing a multistep anodic oxidation method; depositing the noble metal nanometer particles on the conical porous alumina template; and copying the nanometer cone structure of the conical porous alumina template on the polymer by utilizing a nanometer imprinting technology, and transferring the noble metal nanometer particles onto the polymer to obtain the SERS substrate. The method is simple in preparation process and lower in cost and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a polymer-based nanocone structure SERS substrate and a preparation method. Background technique [0002] Surface-enhanced Raman scattering (SERS) 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. The unique performance of SERS has attracted the attention of many researchers, and more and more new SERS substrates have been reported. Nevertheless, most of the previous work focused on designing new substrates for higher Raman enhancement factors, but paid less attention to more practical applications. The flexible and transparent SERS substrate can well realize real-time and in-situ Raman detection of various samples. So far, few substrates with excellent transparency and flexibility and high SERS sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D11/04C25D7/00B82Y40/00
CPCB82Y40/00C25D7/006C25D11/045C25D15/00
Inventor 赵文宁徐智谋刘晓光
Owner HUAZHONG UNIV OF SCI & TECH
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