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Surface-enhanced Raman scattering substrate, preparation method and application thereof

A surface-enhanced Raman, substrate technology, applied in the field of nanoscience, can solve the problems of poor signal relinearity, limited wide application, uneven surface signal, etc., to achieve high reproducibility, wide application prospects, and good detection sensitivity.

Inactive Publication Date: 2019-06-14
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the development of nanoscience, nanomaterials of different shapes are synthesized, often used as nanomaterials to form SERS substrates, including gold and silver nanospheres, nanocubes, nanowires, etc., among which silver nanowires are widely used nanomaterials or One, however, when silver nanowires are used as the material to form the SERS substrate, the hot spots are mainly distributed at the tips of the silver nanowires, and the surface signal is not uniform, and the disorderly arrangement of the silver nanowire film leads to heavy linearity of the signals at each point of the SERS substrate. poor
limit its wide application

Method used

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  • Surface-enhanced Raman scattering substrate, preparation method and application thereof
  • Surface-enhanced Raman scattering substrate, preparation method and application thereof
  • Surface-enhanced Raman scattering substrate, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] 500 μL silver nanowire suspension was directly drop-coated on the surface of the substrate material, and the scanning electron microscope of the obtained silver nanowire was as follows: figure 2 a, AFM of a single unetched silver nanowire is shown in image 3 a, to rhodamine B (10 -7 mol / L) Raman spectrum see Figure 4 a.

Embodiment 2

[0037] In a wide-mouthed glass vessel, 5 mL of silver nanowire hydrosol was added to the surface of 15 mL of chloroform to form a contact surface between two immiscible liquids and three phases of air, and then, carefully etched on the surface of silver nanowire hydrosol After adding 1 mL of acetone, the ordered silver nanowires formed at the oil-water interface gradually migrated from the oil-water interface to the water-air interface, and finally formed an ordered unetched silver nanowire monolayer film on the water-air interface.

[0038] The ordered unetched silver nanowire film is transferred to the surface of the substrate, thereby obtaining the surface-enhanced Raman scattering active substrate of the ordered silver nanowire.

[0039] The scanning electron microscope of the orientation etched silver nanowires prepared by this method is as follows: figure 2 As shown in b, for rhodamine B (10 - 7 mol / L) Raman spectrum see Figure 4 b.

Embodiment 3

[0041] a) Etching the surface of the silver wire: select concentrated ammonia water and 30% hydrogen peroxide (volume ratio 9:1) as the etchant. The etchant was added to 4.5 ml of PVP aqueous solution (5 mg / mL), and 500 μL of silver nanowires were added under vigorous stirring at 3000 rpm. The solution changed color rapidly and released gas, and continued to stir for 5 minutes.

[0042]b) The above-mentioned etched silver nanowires are self-assembled by the three-phase interface method: in a wide-mouthed glass vessel, 5mL of etched silver nanowires solution is added to the surface of 25mL chloroform, and the two immiscible liquids and air A contact surface is formed between the three phases. Then, 1 mL of ethanol is carefully added to the surface of the etched silver nanowire hydrosol, and the ordered silver nanowires formed at the oil-water interface gradually migrate from the oil-water interface to the water-air interface, and finally at the water-air interface. Orderly etc...

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Abstract

The invention belongs to the technical field of laser Raman detection, and discloses a surface-enhanced Raman scattering(SERS) substrate and a preparation method and an application of the surface-enhanced Raman scattering substrate. The surface of the substrate is coated by an ordered etched silver nanowire film, and the ordered etched silver nanowire film is formed by ordered arrangement of mutually-parallel etched silver nanowires, the average distance between adjacent etched silver nanowires is 0-15nm, and the surface roughness of one single etched silver nanowire is 0-20nm. The preparation method is as follows: etching is performed on silver nanowire surfaces by adopting a chemical method, the etched silver nanowires are self assembled by a three-phase interface method, and then the etched silver nanowires after self assembling are transferred to the surface of the substrate. The preparation method has the advantages of simplicity, low costs, easy realization and the like. If the substrate is used for SERS detection, the substrate has high detection sensitivity, and when Rhodamine B is used as a probe molecule, the lowest detection limit can reach 10-11M, and therefore the surface-enhanced Raman scattering substrate has an extensive potential application prospect in the fields of foods, environments, medical treatments, biology and the like.

Description

technical field [0001] The invention belongs to the technical fields of nanometer science, analytical science, life science, environmental science, food science and laser Raman detection, and specifically relates to a surface-enhanced Raman scattering substrate and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (Surface-enhanced Raman scattering, SERS), because of its extremely high sensitivity, can realize single-molecule detection of sample molecules, and has become a very important means of rapid micro-quantity detection. The activity of SERS substrates is largely related to the size, shape, surface roughness and spacing of metal nanoparticles. Therefore, the preparation of high-performance SERS substrates requires quite high requirements for the shape-controlled synthesis and spacing regulation of metal nanoparticles. [0003] With the development of nanoscience, nanomaterials of different shapes are synthesized, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82B1/00B82B3/00B82Y15/00B82Y30/00B82Y40/00G01N21/65
CPCB82B1/001B82B3/0014B82B3/0019B82B3/0047B82Y15/00B82Y30/00B82Y40/00G01N21/658
Inventor 易国斌王建超罗洪盛俎喜红张铭海
Owner GUANGDONG UNIV OF TECH
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