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Metal nano-lattice/single-layer graphene SERS substrate and preparation method and application thereof

A single-layer graphene and metal nanotechnology, applied in the field of material analysis, can solve problems such as limited effect, uneven distribution of noble metal nanoparticles, and difficulty in SERS signal acquisition, achieving easy operation, improving SERS signal repeatability and stability, The effect of simple method

Inactive Publication Date: 2020-01-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] SERS substrates prepared by traditional methods have many problems. A single metal nanostructure can only provide electromagnetic enhancement. Although the electromagnetic enhancement is relatively high, the effect is limited. In addition, the distribution of noble metal nanoparticles and nanowires with various shapes is uneven. , leading to difficulties in SERS signal acquisition, it is necessary to constantly search for test points, and the intensity of enhanced Raman signals collected at different test points is different, which increases the difficulty of SERS quantitative analysis

Method used

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  • Metal nano-lattice/single-layer graphene SERS substrate and preparation method and application thereof
  • Metal nano-lattice/single-layer graphene SERS substrate and preparation method and application thereof
  • Metal nano-lattice/single-layer graphene SERS substrate and preparation method and application thereof

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Embodiment 1

[0035] Such as Figure 4 As shown, the metal nano-lattice / single-layer graphene SERS substrate includes a silicon substrate 3, a single-layer graphene 4 and a uniform metal nano-lattice 2, and the single-layer graphene 4 is located on the silicon substrate 3, and the uniform metal nano-lattice 2 is evenly distributed on the single-layer graphene 4, and the uniform metal nano-lattice array is prepared by a double-pass nanohole array.

Embodiment 2

[0037] The preparation method of metal nano lattice / single-layer graphene SERS substrate comprises the following steps:

[0038] The first step: transfer the large-area continuous single-layer graphene grown by CVD method to the silicon substrate by wet method, and the structure after the transfer is as follows figure 1 shown. The specific process is first spin-coating a layer of PMMA on the CVD-grown graphene copper foil, and then putting the graphene copper foil that has been spin-coated with PMMA into ferric chloride solution. The concentration of ferric chloride solution is 1Mol / L. After complete corrosion, the graphene was washed several times in deionized water, and finally transferred to a silicon wafer in water, and then the PMMA on the graphene surface was dissolved with acetone.

[0039] The second step: transfer the double-pass nanostructure template to the single-layer graphene substrate obtained in the first step, and the structure after the transfer is as follow...

Embodiment 3

[0047] The application of the metal nano-array / single-layer graphene SERS substrate prepared by the preparation method described above is used to detect hydrophobic aromatic compounds. Specific application examples include the detection of environmental pollutants polycyclic aromatic hydrocarbons. Due to the hydrophobic structure of polycyclic aromatic hydrocarbons, they cannot be directly adsorbed on the metal-reinforced substrate, but can be adsorbed by graphene, so the substrate can effectively detect environmental pollutants polycyclic aromatic hydrocarbons.

[0048]In summary, the present invention couples the electromagnetic enhancement of metal nanostructures with the chemical enhancement of graphene to prepare a SERS substrate with high sensitivity and good uniformity, which can be used to detect hydrophobic aromatic compounds. The method of growing metal nano lattices on graphene is simple and easy to operate, and can prepare large-area SERS substrates, and the prepar...

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Abstract

The invention discloses a metal nano-lattice / single-layer graphene SERS substrate and a preparation method and an application thereof. The metal nano-lattice / single-layer graphene SERS substrate prepared by the preparation method comprises a silicon substrate, single-layer graphene and uniform metal nano-lattices, wherein the single-layer graphene is located on the silicon substrate; the uniform metal nano-lattices are uniformly distributed on the single-layer graphene; and the regularly arranged metal nano-lattice / single-layer graphene SERS substrate is obtained. Electromagnetic enhancement of a metal nanostructure is coupled with chemical enhancement of the graphene, thereby detecting hydrophobic aromatic compounds; the method is simple, easy to operate and capable of preparing the large-area SERS substrate; the prepared SERS substrate is uniform in surface hotspot distribution and large in area; and the repeatability and stability of an SERS signal can be improved.

Description

technical field [0001] The invention belongs to the technical field of material analysis, in particular to a metal nano lattice / single-layer graphene SERS substrate and a preparation method and application thereof. Background technique [0002] Raman spectroscopy provides a unique molecular fingerprint consisting of many narrow-band peaks corresponding to molecular vibrational modes, allowing the identification of molecular species even in mixtures of multiple analytes. However, Raman scattering has a low scattering cross-section, resulting in very low sensitivity. This problem was initially solved by the technique of surface-enhanced Raman scattering (SERS), which has become a powerful method for studying the structural properties of various analytical substances. [0003] The commonly used methods for preparing SERS substrates can be divided into two categories, including physical methods and chemical methods. Among them, physical methods include thermal evaporation, elec...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y15/00C01B32/186
CPCB82Y15/00C01B32/186G01N21/658
Inventor 张宇韩应宽韩琳
Owner SHANDONG UNIV
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