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Performance-controllable layer-by-layer assembled nanoparticle SERS substrate and preparation method thereof

A technology of layer-by-layer assembly and nano-particles, which is applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems of difficult SERS performance, and achieve the effect of simple and effective methods, wide applicability, and good SERS activity

Active Publication Date: 2016-02-24
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that there are few reports on the SERS performance of nanofilms assembled from nanoparticles and polyelectrolytes, and the controllability of their SERS performance is still a difficult point.

Method used

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  • Performance-controllable layer-by-layer assembled nanoparticle SERS substrate and preparation method thereof
  • Performance-controllable layer-by-layer assembled nanoparticle SERS substrate and preparation method thereof
  • Performance-controllable layer-by-layer assembled nanoparticle SERS substrate and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] 1. Preparation of negatively charged citrate-protected gold nanoparticles of different sizes: Add 0.5 ml of 1% chloroauric acid aqueous solution to 50 ml of water and heat to boil, then add 2 ml and 0.65 ml respectively The sodium citrate aqueous solution with a mass fraction of 1% was heated and reacted for 15 minutes to obtain gold nanoparticle aqueous solutions with particle diameters of 17 nm (referred to as small gold nanoparticles) and 43 nm (referred to as large gold nanoparticles). The gold nanoparticle aqueous solution can be directly used for subsequent layer-by-layer assembly.

[0019] 2. Layer-by-layer assembly of gold nanoparticles and polyelectrolytes: first, the quartz sheet is subjected to plasma pretreatment to make its surface have polar groups; then the quartz sheet is immersed in polydienylpropylenedimethylammonium chloride ( PDDA) aqueous solution (1mg / ml) for 30 minutes, rinse with deionized water for 1 minute after taking it out; then immerse the ...

Embodiment 2

[0022] 1. Preparation of negatively charged citrate-protected gold nanoparticles of different sizes: Add 0.5 ml of 1% chloroauric acid aqueous solution to 50 ml of water and heat to boil, then add 2 ml and 0.65 ml respectively The sodium citrate aqueous solution with a mass fraction of 1% was heated and reacted for 15 minutes to obtain gold nanoparticle aqueous solutions with particle diameters of 17 nm (referred to as small gold nanoparticles) and 43 nm (referred to as large gold nanoparticles). The gold nanoparticle aqueous solution can be directly used for subsequent layer-by-layer assembly.

[0023] 2. Layer-by-layer assembly of gold nanoparticles and polyelectrolytes: first, the quartz sheet is subjected to plasma pretreatment to make its surface have polar groups; then the quartz sheet is immersed in polydienylpropylenedimethylammonium chloride ( PDDA) aqueous solution for 10 minutes, rinse with deionized water for 1 minute after taking it out; then immerse the PDDA-asse...

Embodiment 3

[0026] 1. Preparation of negatively charged citrate-protected gold nanoparticles of different sizes: Add 0.5 ml of 1% chloroauric acid aqueous solution to 50 ml of water and heat to boil, then add 2 ml and 0.65 ml respectively The sodium citrate aqueous solution with a mass fraction of 1% was heated and reacted for 15 minutes to obtain gold nanoparticle aqueous solutions with particle diameters of 17 nm (referred to as small gold nanoparticles) and 43 nm (referred to as large gold nanoparticles). The gold nanoparticle aqueous solution can be directly used for subsequent layer-by-layer assembly.

[0027]2. Layer-by-layer assembly of gold nanoparticles and polyelectrolytes: first, the quartz sheet is subjected to plasma pretreatment to make its surface have polar groups; then the quartz sheet is immersed in polydienylpropylenedimethylammonium chloride ( PDDA) aqueous solution for 15 minutes, rinse with deionized water for 1 minute after taking it out; then immerse the PDDA-assem...

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Abstract

The invention belongs to the field of material chemistry and detection and relates to a performance-controllable layer-by-layer assembled nanoparticle SERS substrate and a preparation method thereof. The substrate comprises a carrier, the surface of the carrier is provided with a polar group, the surface of the carrier is coated with a layer-by-layer assembled film, from inside to outside, even number layers of the layer-by-layer assembled film are negatively charged metal nanoparticle films, odd number layers of the layer-by-layer assembled film are positively charged polyelectrolyte films and the outermost layer is a negatively charged metal nanoparticle film. Through loading with metal nanoparticle films with the same metal and different particle sizes, SERS substrate performance regulation and control are realized. The preparation method is simple and effective and has wide applicability. The SERS substrate has good SERS activity and can be used for micromolecule detection.

Description

technical field [0001] The invention belongs to the field of material chemistry and detection, and in particular relates to a layer-by-layer assembled nanoparticle SERS substrate with controllable properties and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy is widely used in the field of sensing and detection. By rationally designing and regulating metal nanostructures, a highly sensitive SERS substrate with a detection limit reaching the single-molecule level can be obtained, and rich structural information of the detected molecules can be provided. Therefore, SERS technology is widely used in many fields such as chemistry, materials and biology. With the continuous development of nanotechnology, the controllable preparation of SERS substrates has gradually become a hot topic in this field. [0003] Among many nanofabrication techniques, layer-by-layer assembly is considered as a simple, economical and ra...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 刘志承刘亚青白露赵贵哲
Owner ZHONGBEI UNIV
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