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A flexible SERS substrate with graphene/silver nanoflowers/pmma "sandwich" structure and its preparation method

A silver nanometer and graphene technology, which is used in material excitation analysis, instruments, measurement devices, etc., can solve the problem that noble metal nanostructures and substrates cannot be closely combined, the rigid substrate of SERS is difficult to adapt to the surface morphology, and noble metal nanostructures are easy to oxidize. and other problems, to achieve the effect of good signal enhancement, wide applicability and longevity

Active Publication Date: 2020-09-01
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the rigid substrate of SERS in the prior art is difficult to adapt to various surface topography, the tight bonding between the noble metal nanostructure and the substrate cannot be achieved, and the noble metal nanostructure is easy to oxidize. At present, there is still no effective solution. Program

Method used

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  • A flexible SERS substrate with graphene/silver nanoflowers/pmma "sandwich" structure and its preparation method
  • A flexible SERS substrate with graphene/silver nanoflowers/pmma "sandwich" structure and its preparation method
  • A flexible SERS substrate with graphene/silver nanoflowers/pmma "sandwich" structure and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Using high-purity copper foil as a catalyst, grow single-layer graphene by CVD technology, the carbon source is methane, the growth substrate is copper foil, and the growth conditions: the air pressure is 10 5 Pa, the growth temperature is 1100°C, and the growth time is 1h.

[0040] 2. A layer of silver nanoflowers is grown on the surface of graphene by microcurrent-assisted chemical reduction method, specifically: graphene / copper foil is used as the negative electrode, silver foil is used as the positive electrode, and the current size is 150μA / cm -1 , the electrolyte is AgNO with a concentration of 2g / L 3 Solution and 10g / L citric acid mixture, the reaction time is 50s.

[0041] 3. FeCl with a concentration of 1M 3 The solution is an etching solution, and the copper foil substrate is removed in an environment of 20°C.

[0042] The scanning electron microscope images of the prepared precursor substrate copper foil / graphene / silver nanoflowers are as follows: figu...

Embodiment 2

[0044] 1. Using high-purity copper foil as a catalyst, grow single-layer graphene by CVD technology, the carbon source is methane, the growth substrate is copper foil, and the growth conditions: the air pressure is 10 5 Pa, the growth temperature is 1100°C, and the growth time is 1h.

[0045] 2. A layer of silver nanoflowers is grown on the surface of graphene by microcurrent-assisted chemical reduction method, specifically: graphene / copper foil is used as the negative electrode, silver foil is used as the positive electrode, and the current size is 200μA / cm -1 , the electrolyte is AgNO with a concentration of 1.5g / L 3 Solution and 15g / L citric acid mixture, the reaction time is 55s.

[0046] 3. With a concentration of 0.5M FeCl 3 The solution is an etching solution, and the copper foil substrate is removed in an environment of 10°C.

Embodiment 3

[0048] 1. Using high-purity copper foil as a catalyst, grow single-layer graphene by CVD technology, the carbon source is methane, the growth substrate is copper foil, and the growth conditions: the air pressure is 10 5 Pa, the growth temperature is 1100°C, and the growth time is 1h.

[0049] 2. A layer of silver nanoflowers is grown on the surface of graphene by microcurrent-assisted chemical reduction method, specifically: graphene / copper foil is used as the negative electrode, silver foil is used as the positive electrode, and the current size is 50μA / cm -1 , the electrolyte is AgNO with a concentration of 1.5g / L 3 Solution and 10g / L citric acid mixture, the reaction time is 60s.

[0050] 3. With a concentration of 0.8M FeCl 3 The solution is an etching solution, and the copper foil substrate is removed in an environment of 20°C.

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Abstract

The invention discloses a graphene / silver nanoparticle / PMMA 'sandwich' structural flexible SERS substrate and a preparation method thereof. The invention aims to solve the problems of the prior art that a SERS rigid substrate is difficult to adapt to various different surface appearances, the precious metal nanometer structure and the substrate cannot be tightly combined with each other and the precious metal nanometer structure is easily oxidized. With a flexible structure, the prepared SERS substrate can be adhered to the surfaces with various surfaces for in situ test and can achieve the effect of performing the in situ test on a raman signal. The specific scheme is as follows: the flexible SERS substrate comprises single-layer graphene, a silver nanoparticle layer growing on the surface of the single-layer graphene and a PMMA film covered on the surface of the silver nanoparticle layer, so that the silver nanoparticle layer is clamped between the single-layer graphene and the PMMA film.

Description

technical field [0001] The invention belongs to the field of preparation of flexible SERS substrates, in particular to a flexible SERS substrate with a graphene / silver nanoflower / PMMA "sandwich" structure and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) has attracted widespread attention since its inception because it can effectively amplify the inherent Raman signal and realize ultra-sensitive single-molecule detection. fields. The mechanism of SERS is widely accepted as physical enhancement and chemical enhancement. The physical enhancement is mainly caused by the electric field enhancement caused by the surface plasmon resonance, and the chemical enhancement is mainly caused by the charge exchange between the substrate and the molecule. Generally speaking, rough noble metal surfaces and noble metal nanostructures are mainly physically enhanced, while noble metal planes, some semiconductors and new two-dimensional la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 姜守振仇恒伟满宝元张超焦扬郁菁
Owner SHANDONG NORMAL UNIV