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Silver-gold nano-wire PDMS composite film material for SERS detection, preparation method and applications thereof

A composite thin film and gold nanowire technology, which is applied in the direction of material analysis, material excitation analysis, and material analysis through optical means, can solve the problems of non-linear concentration and difficult quantitative detection, etc., and achieve the effect of eliminating oxidation

Active Publication Date: 2019-11-29
NINGBO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional SERS detection, the oxidation of noble metal nanoparticles, the aggregation of nanoparticles caused by the molecular solution to be tested, and the interference of other external environments will affect the Raman detection results, especially making the SERS spectrum intensity of the molecule to be tested not linear with its concentration. relationship, it is difficult to achieve quantitative detection

Method used

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  • Silver-gold nano-wire PDMS composite film material for SERS detection, preparation method and applications thereof
  • Silver-gold nano-wire PDMS composite film material for SERS detection, preparation method and applications thereof
  • Silver-gold nano-wire PDMS composite film material for SERS detection, preparation method and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0031]A silver-gold nanowire PDMS composite film material for SERS detection, the material is composed of two parts: PDMS polymer film and silver-gold nanowire, wherein the PDMS polymer film is a flexible and bendable lining with intrinsic Raman peaks The bottom and the surface are smooth and flat. The silver-gold nanowires are composed of gold nanowires grown on the surface of the PDMS polymer film and silver nanoparticles coated on the top of the gold nanowires. The gold nanowires are arranged vertically and closely arranged to form a forest. shape, its preparation method comprises the following steps:

[0032] 1. Preparation of PDMS film: Mix and stir sylgard 184 prepolymer and curing agent at a mass ratio of 10:1, then spin-coat it on the surface of a silicon wafer (3000 rpm, 10 seconds) and place it at 80°C Under heating for 2 hours to solidify, after it is cooled to room temperature, the PDMS film is peeled off from the silicon wafer for use;

[0033] 2. Preparation of ...

Embodiment 2

[0041] With above-mentioned embodiment 1, its difference is:

[0042] Step 1: In the preparation of PDMS film: mix and stir the sylgard 184 PDMS prepolymer and the curing agent at a mass ratio of 8:1, then spin-coat it on the surface of the silicon wafer, and place it at 75°C for 3 hours to cure , after it is cooled to room temperature, the PDMS film is peeled off from the silicon wafer for use;

[0043] Step 2: In the preparation of the gold nanowire PDMS composite film material: after the PDMS film was treated with oxygen plasma at 25 watts for 15 minutes, the film was placed in a 0.1wt% 3-aminopropyltriethoxysilane solution. After amination treatment for 1.5 hours, wash with ethanol and water, place it in a gold seed solution with a diameter of 10 nanometers stabilized by sodium citrate for 1.5 hours, coat the gold seeds on the surface of the PDMS membrane by electrostatic attraction, and again After washing with ethanol and water, it was placed in a reaction containing 4-...

Embodiment 3

[0048] With above-mentioned embodiment 1, its difference is:

[0049] In step 1, mix and stir the sylgard 184 PDMS prepolymer and the curing agent at a mass ratio of 5:1, then spin-coat it on the surface of the silicon wafer, place it at 85°C for 1 hour to cure, and wait for it to cool to After room temperature, the PDMS film was peeled off from the silicon wafer for use;

[0050] Step 2: In the preparation of the gold nanowire PDMS composite film material: After the PDMS film was treated with oxygen plasma at 35 watts for 5 minutes, the film was placed in a 0.1wt% 3-aminopropyltriethoxysilane solution. After amination treatment for 1.5 hours, wash with ethanol and water, place it in a gold seed solution with a diameter of 20 nanometers stabilized by sodium citrate for 1.5 hours, coat the gold seeds on the surface of the PDMS membrane by electrostatic attraction, and again After washing with ethanol and water, it was placed in a reaction containing 4-mercaptobenzoic acid (at ...

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Abstract

The invention discloses a silver-gold nano-wire PDMS composite film material for SERS detection, a preparation method and applications thereof, wherein the material comprises two parts of a PDMS polymer film and silver-gold nano-wires, the PDMS polymer film is a flexible bendable substrate with an intrinsic Raman peak, and has a smooth and flat surface, the silver-gold nano-wires comprise gold nano-wires growing on the surface of the PDMS polymer film and silver nanoparticles coating the top portion of the gold nano-wires, and the gold nano-wires are vertically arranged and closely arranged toform a forest shape. The preparation method comprises: preparation of a PDMS film, preparation of a gold nano-wire PDMS composite film material, and preparation of a silver-gold nano-wire PDMS composite film material. According to the present invention, the good linear dependence relationship of Raman signals on the concentration of a to-be-detected object can be obtained, the Raman signals of Raman molecules can be remarkably enhanced, and high sensitivity and high accuracy are achieved.

Description

technical field [0001] The invention relates to the fields of material engineering and nanotechnology, in particular to a silver-gold nanowire PDMS composite thin film material used for SERS detection and its preparation method and application. Background technique [0002] At present, due to the discharge of some toxic gases, waste water, and the extensive use of pesticides in the field of agricultural production. Environmental pollution has had a serious impact and harm on people's health and daily life. Therefore, people urgently need to develop an effective technical means that can quickly detect and identify harmful chemicals on the food surface, in water bodies and in the atmosphere. Among a series of detection methods, surface-enhanced Raman scattering (SERS) technology has attracted widespread attention due to its single-molecule-level recognition sensitivity, no photobleaching, and the ability to perform multiple detections at a single excitation wavelength. Thus,...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J7/12C08J5/18C08L83/04G01N21/65
CPCC08J5/18C08J7/06C08J7/12C08J7/123C08J2383/04G01N21/658
Inventor 姜涛庄文婷马懿姜勇
Owner NINGBO UNIV