Graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device and preparation method

A metal nanoprobe and nanoprobe technology, which is applied in Raman scattering, color/spectral characteristic measurement, instruments, etc., can solve the problems of low surface Raman spectrum enhancement factor and large attenuation, and achieve increased interaction and good Biocompatibility, achieving dynamic tuning effects

Active Publication Date: 2018-07-06
CHONGQING UNIV
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Problems solved by technology

However, the attenuation of graphene in the visible light band is very large, and the enhancement factor of the surface Raman spectrum is very low

Method used

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  • Graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device and preparation method
  • Graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device and preparation method
  • Graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device and preparation method

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention more clear, the preferred examples of the present invention will be further described in detail below in conjunction with the drawings. The same symbols in the drawings represent the same or similar components.

[0038] see figure 1 , the graphene metal conformal nanoprobe-enhanced Raman infrared dual-spectrum device designed in the present invention includes a substrate 1, a metal nanoprobe 2, a dielectric layer 3, a graphene nanoprobe 4, a source pole 5 and drain 6 metal electrodes. During the test, the detection molecules 8 to be tested are placed on the chip by means of spray coating, spin coating and the like.

[0039] Wherein, the metal nanoprobe 2 is located on the substrate 1 as the metal back electrode at the same time, the dielectric layer 3 is located on the metal nanoprobe 2, the graphene nanoprobe 4 is located on the dielectric layer 3, and the source 5 and the drain 6 ...

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Abstract

The invention discloses a graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device. The graphene and metal conformal nanoprobe enhanced Raman infrared dual-spectrum device comprises a substrate, a metal nanoprobe, a dielectric layer, a graphene nanoprobe, a source electrode and a drain electrode. The metal nanoprobe and the graphene nanoprobe are the same in shape. Moreover, the metal nanoprobe serves as a grid electrode, and the dielectric layer is clamped between the metal nanoprobe and the graphene nanoprobe to form a structure similar to a parallel plate capacitor. External voltage is directly applied between the metal nanoprobe and the graphene nanoprobe, so that the Fermi energy of graphene can be adjusted. Under the radiation of visible light wave band laser, the local area surface plasmons of the metal nanoprobe are stimulated, and the Raman scattering signal of trace molecules can be enhanced; and under the radiation of infrared light wave, the localarea surface plasmons of the graphene nanoprobe are stimulated, and the infrared absorption spectrum signal of the trace molecules can be enhanced dynamically in a broadband range. The device has theadvantages that the enhanced wave band can be tuned by an external electric field, the detection sensitivity is high, the detection substance variety range is wide and the stability is high.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced spectroscopy, in particular to a dual-enhanced spectroscopy device and a preparation method for simultaneously realizing surface Raman spectroscopy and surface infrared absorption spectroscopy. Background technique [0002] Molecular spectroscopy detection technology is a powerful tool for determining important information such as the composition and structure of biomolecules, and is widely used in important fields such as food safety, environmental monitoring, chemical analysis, and biomedicine. The surface-enhanced molecular spectroscopy technology developed based on the surface plasmon effect breaks through the technical bottleneck that traditional molecular spectroscopy technology can only averagely measure a large number of molecules, and raises the molecular detection limit to the single-molecule level. Among them, the most representative ones are Surface-enhanced Raman scattering (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/35
CPCG01N21/35G01N21/658
Inventor 韦玮农金鹏兰桂莲陈娜蒋汉斌骆鹏
Owner CHONGQING UNIV
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