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

A silver nanoparticle and flexible surface technology, which is 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 popularization, simple preparation method, and improved Effects of SERS Signals

Active Publication Date: 2018-12-21
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 preparation method of substrate
  • Composite flexible surface enhanced Raman substrate based on silver nanoparticles and preparation method of substrate
  • Composite flexible surface enhanced Raman substrate based on silver nanoparticles and preparation method of substrate

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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 of the substrate. According to the method, first, a chemical reduction method is utilized to prepare a silver colloid containing a large quantity of silver nanoparticles (AgNPs); second, the silver colloid is mixed with polydimethylsiloxane (PDMS) diluted with methylbenzene to form a suspension, the suspension is dropwise added onto the surface of a hard baseboard, and a PDMS thin film containing a large quantity of silver nanoparticles is formed through heat curing and is peeled off; and last, an impregnation method is used to transfer a layer of silver nanoparticles on the prepared thin film, and the composite flexible surface enhanced Raman substrate basedon silver nanoparticles is prepared. An experiment indicates that by use of the surface enhanced Raman scattering substrate prepared through the method, high-sensitivity SERS detection can be realized, and Raman signals are uniform; and meanwhile, the substrate has good mechanical stability and flexibility, and SERS signals are not attenuated but even substantially enhanced under large-range tensile strain. The method is convenient and fast to use and low in cost, and large-area repetitive preparation can be realized.

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 Applications(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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