Metal graphene multilayer resonance structure enhanced Raman infrared dual spectrum device and preparation method

Abstract

The invention discloses an enhanced Raman and infrared double-spectrum device with a metal and graphene multi-layer resonant structure. The enhanced Raman and infrared double-spectrum device comprisesa substrate, a metal reflecting layer, a dielectric layer, metal micron antennas, graphene films and metal nano particles. The dielectric layer is located among the metal micron antennas and the metal reflecting layer, so as to form a metal-dielectric-metal reflection type micron antenna structure. The graphene films are located among the metal nano particles and the metal micron antennas, so asto form nano gaps. Under the irradiation of an infrared light wave, the antenna resonance effect of the metal micron antennas is excited; an infrared absorption spectrum signal of a trace molecule isenhanced in a wide wavelength range. Under the irradiation of laser light in a visible light waveband, the local-area surface plasmons of the metal nano particles are excited; the nano gaps among themetal nano particles and the metal micron antennas generate a high-intensity local-area electric field resonant mode; a Raman scattering signal of the trace molecule is enhanced, and the enhanced Raman and infrared double-spectrum device has the advantages of being wide in enhancement waveband, high in enhancement factor, low in cost and wide in range of the varieties of detected substances, and can be processed in a large-area manner, and the like.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced spectroscopy, in particular to a device capable of achieving double enhancement of surface Raman spectrum and surface infrared absorption spectrum on a single device and a preparation method thereof. Background technique [0002] Surface-enhanced spectroscopy is a molecular spectroscopy detection technology developed based on the surface plasmon effect. It is a powerful tool for determining important information such as the composition and structure of biomolecules. It is used in food safety, environmental monitoring, chemical analysis and biomedicine. The field has broad application prospects. The most representative techniques are Surface-enhanced Raman scattering (SERS) and Surface-enhanced infrared absorption (SEIRA). Among them, the SERS technology can detect the change information of the polarizability caused by the vibration of the chemical bond in the molecule, and the SEIRA tech...

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Problems solved by technology

[0005] In summary, although the above two methods can achieve the double enhancement effect of the Raman signal and the infrared absorption spectrum signal of the substance to be tested, they are all at the expense of one of the (SERS or SEIRA) enhancement factors , there is no guarantee that both the Raman signal and the infrared spectrum signal have a high enhancement factor

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