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Ultra-sensitive SERS substrate and preparation method thereof

A sensitive and substrate-based technology, applied in the field of detection, can solve the problems of no further practical application of SERS substrate, insufficient sensitivity of SERS effect, poor repeatability, etc., and achieve the effect of improving sensitivity, eliminating cumbersome steps, and controlling shape

Inactive Publication Date: 2015-07-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity of the SERS effect of the substrate constructed above is still not enough, the lifetime is short, the repeatability is poor, and graphene needs to be transferred (transferring graphene is very troublesome and the parameters are not easy to control)
On the other hand, there is also the problem of high cost
None of the currently constructed SERS substrates has been further practically applied.

Method used

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  • Ultra-sensitive SERS substrate and preparation method thereof
  • Ultra-sensitive SERS substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A Cu film with a single layer of graphene and an area of ​​3cm×3cm was used to Cu nanoparticles were evaporated. Configure copper titanium blue to a concentration of 10 -8 mol / L solution. Add 5 drops of prepared copper-titanium blue solution on the Cu nanoparticles and let it dry. The substrate with copper-titanium cyanine was detected under a Raman spectrometer, and the incident light angle was 60 degrees. The results show that the enhancement factor (EF) value is 1.9×10 7 . The relative standard deviation of the SERS signal is below 20% on one substrate.

Embodiment 2

[0022] A Cu film with a single layer of graphene and an area of ​​2.5cm×2.5cm was used to Cu nanoparticles were evaporated. Take a clean 50ml beaker, pour 20ml of acetone into it, and immerse the Cu film in the acetone for 10 minutes. Then take it out and let it dry. Configure copper titanium blue to a concentration of 10 -8 mol / L solution. Add 4 drops of prepared copper-titanium blue solution on the Cu nanoparticles and let it dry. The substrate with copper-titanium cyanine was detected under a Raman spectrometer, and the incident light angle was 90 degrees. The result shows that the EF value is 1.76×10 7 for. The relative standard deviation of the SERS signal is below 20% on one substrate.

Embodiment 3

[0024] A Cu film with a single layer of graphene and an area of ​​2.5cm×2.5cm was used to Cu nanoparticles were evaporated. Take a clean 50ml beaker, pour 20ml of acetone into it, and immerse the Cu film in the acetone for 20 minutes. Then take it out and let it dry. Configure copper titanium blue to a concentration of 10 -8 mol / L solution. Add 4 drops of prepared copper-titanium blue solution on the Cu nanoparticles and let it dry. The substrate with copper-titanium cyanine was detected under a Raman spectrometer, and the incident light angle was 70 degrees. The result shows that the EF value is 1.73×10 7 . The relative standard deviation of the SERS signal is below 20% on one substrate.

[0025] The above-mentioned embodiment of the present invention is compared with the embodiment of Cu nanoparticle / graphene / quartz glass result:

[0026] Wash the quartz glass and dry it. The graphene was transferred to a quartz glass with an area of ​​3 cm × 3 cm by polymethyl met...

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Abstract

The invention relates to an ultra-sensitive SERS substrate and a preparation method thereof. A superstrong plasma coupling effect is produced while the Cu nanometer particles are separated from a Cu film by use of graphene, so that the sensitivity of the SERS based on copper can be obviously promoted. By use of full copper material, the cost of the structure is greatly lowered. The Cu nanometer particles are directly paved on the Cu film growth with graphene on the surface by virtue of a chemical vapor deposition (CVD) method in the preparation process, and the complex graphene transferring process is omitted. Furthermore, the coverage density of the Cu nanometer particles of the structure is adjustable, and sandwich structure substrates with different Cu nanometer particles coverage densities can be obtained after the Cu film is soaked in the acetone for a certain time. The preparation method is convenient and fast.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to an ultrasensitive copper SERS substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) has important application prospects due to its ultrasensitivity in molecular detection and so on. To obtain a strong SERS effect, the key is to choose a suitable support and build a suitable substrate on the basis of the support. Graphene has been widely studied because of its unique structure and excellent photoelectric properties. Nano-noble metal particles have local surface plasmon effect, which can be combined with different supports to produce strong SERS effect. Precious metal materials are generally gold, silver, and copper. At present, more and more studies have been conducted on the SERS effect of the substrate composed of gold, silver nanoparticles and graphene [Adv.Funct.Mater.,2014,24,3114 ]. However, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 李炫华朱金萌郭绍晖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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