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Composite flexible surface-enhanced Raman substrate based on silver nanoparticles and its preparation method

A silver nanoparticle and flexible surface technology, applied in the field of composite flexible surface enhanced Raman substrate based on silver nanoparticle and its preparation, can solve the problem that the SERS signal enhancement effect needs to be improved, and achieves easy promotion, improved SERS signal, mechanical Stable effect

Active Publication Date: 2022-02-08
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its enhancement effect on SERS signal needs to be improved

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  • Composite flexible surface-enhanced Raman substrate based on silver nanoparticles and its preparation method
  • Composite flexible surface-enhanced Raman substrate based on silver nanoparticles and its preparation method
  • Composite flexible surface-enhanced Raman substrate based on silver nanoparticles and its preparation method

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[0040] The invention provides a composite flexible surface-enhanced Raman substrate based on silver nanoparticles and a preparation method thereof, comprising:

[0041] Polydimethylsiloxane-silver colloid composite structure flexible substrate;

[0042] Silver nanoparticles deposited on polydimethylsiloxane-silver colloid composite structure flexible substrate;

[0043] Among them, the PDMS polymer is mixed with silver colloid, transferred, and cured to form a flexible film, which provides a favorable platform for the probe molecules to directly detect the surface of the object.

[0044] In order to further enhance the surface Raman scattering effect, a layer of silver nanoparticles was transferred on the prepared film by dipping method.

[0045] Compared with the traditional flexible Raman substrate with pure polymer as the template, the polydimethylsiloxane-silver colloid hybrid structure flexible substrate provided by the present invention can provide high-density hotspots w...

Embodiment 1

[0072] 1) Mix 20ML ethylene glycol (C 2 h 6 o 2 , 99.0%) solution was added in the 100ml flask, continued to stir evenly, when heating from room temperature to 70 ℃, add 0.25g polyvinylpyrrolidone (PVP, Mw=55000) in the ethylene glycol solution, when heating to 135 ℃, to Add 0.05g silver nitrate (AgNO 3 ), continue to stir evenly for 1 hour, when the mixed solution turns bright yellow, cool the mixed solution to room temperature and add 60ml of acetone, then centrifuge to obtain a solid precipitate, which is silver nanoparticles, washed 3 times with deionized water , and finally dispersed in 0.5ml deionized water to obtain the colloid of silver nanoparticles

[0073] 2) Mix the liquid PDMS main agent (Sylgard 184 silicone elastomer base) and the curing agent (Sylgard 184 silicone elastomer curing agent) at a mass ratio of 10:1, stir well, remove bubbles by ultrasonic vibration, and prepare a liquid PDMS prepolymer; Mix toluene with the prepared PDMS prepolymer at a volume ...

Embodiment 2

[0083] 20ML ethylene glycol (C2 h 6 o 2 , 99.0%) solution was added in the 100ml flask, continued to stir evenly, when heating from room temperature to 80 ℃, in the ethylene glycol solution, add 0.25g polyvinylpyrrolidone (PVP, Mw=55000), when heating to 130 ℃, to Add 0.05g silver nitrate (AgNO 3 ), continue to stir evenly for 1.5 hours, when the mixed solution turns bright yellow, cool the mixed solution to room temperature and add 60ml of acetone, then centrifuge to obtain a solid precipitate, which is silver nanoparticles, washed 3 times with deionized water , and finally dispersed in 0.8ml deionized water to obtain the colloid of silver nanoparticles

[0084] Mix the liquid PDMS main agent and the curing agent at a mass ratio of 10:1, stir well, remove air bubbles by ultrasonic vibration, and prepare a liquid PDMS prepolymer; mix toluene and the prepared PDMS at a volume ratio of 2:1, and stir thoroughly , ultrasonically oscillate to dilute PDMS; mix the prepared silver...

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Abstract

The invention provides a composite flexible surface-enhanced Raman substrate based on silver nanoparticles and a preparation method thereof. First, the silver colloid containing a large amount of silver nanoparticles (AgNPs) was prepared by chemical reduction; secondly, the silver colloid was mixed with polydimethylsiloxane (PDMS) diluted with toluene to form a suspension, and the suspension was added dropwise to On the surface of the hard substrate, the PDMS film containing a large amount of silver nanoparticles is formed by heating and curing, and peeled off; finally, a layer of silver nanoparticles is transferred on the prepared film by dipping method to prepare a composite flexible surface reinforcement based on silver nanoparticles. Raman base. Experiments show that the surface-enhanced Raman scattering substrate prepared by this method can achieve high-sensitivity SERS detection, the Raman signal is uniform, and it has good mechanical stability and flexibility, and the SERS signal does not attenuate under a wide range of tensile strains. even a substantial increase. The method of the invention is simple and fast, has low cost and can be repeatedly prepared in a large area.

Description

technical field [0001] The invention belongs to the field of nanomaterials and optical technology, in particular to a composite flexible surface-enhanced Raman substrate based on silver nanoparticles and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a highly sensitive spectroscopic method for detecting interface properties and intermolecular interactions. and national defense and security have received extensive attention. In SERS detection, researchers mainly rely on plasmon resonance (LSPR) generated on the surface of metal nanostructures to achieve electromagnetic field enhancement. Some rigid substrates are used to deposit these nanostructures and serve as Raman active substrates. However, in many cases, traditional rigid substrates are not suitable for direct detection of molecules on the surface of objects, especially on uneven or inaccessible surfaces, so various flexible Raman active substrates have emerged....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B22F9/24B82Y40/00
CPCG01N21/658B82Y40/00B22F9/24
Inventor 张超姜守振修显武徐纪华郭雨满宝元
Owner SHANDONG NORMAL UNIV
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