Local surface plasma resonant sensor and fabrication method and application thereof

Abstract

The invention discloses a local surface plasma resonant sensor and fabrication method and application thereof. The sensor comprises a transparent dielectric layer and silver films, wherein the transparent dielectric layer is obtained by preparation of a polycarbonate material and comprises a substrate and a nanometer column array, the nanometer column array is arranged on the substrate, the shapesand the cross sections of the top and the bottom of each nanometer column in the nanometer column array are same, the cross section area of the top of the nanometer column is larger than the cross section area of a middle part of the nanometer column, the bottom of the nanometer column is connected with the substrate, the silver films cover the top and the bottom of the nanometer column, gaps areformed between the silver film covering the substrate and the nanometer columns, and SiO2/TiO2 composite coating layers are further coated on surfaces of the nanometer columns. The sensor is high insensitivity and accuracy and long in service lifetime and has favorable application prospect in the field of biochemical detection.

Description

technical field [0001] The invention relates to the technical field of sensor materials, in particular to a localized surface plasmon resonance sensor and its preparation method and application. Background technique [0002] With the rapid development of nanofabrication technology, localized surface plasmon resonance technology of metal nanoparticles or nanoarray structures has received extensive attention. The incident light is coupled with the free charge density oscillation on the surface of metal nanoparticles or nanoarray structures, resulting in localized surface plasmon resonance and strong resonance absorption spectrum. The resonant absorption wavelength is related to the structure, shape, size, distribution of the nanoparticle or nanoarray structure and the dielectric coefficient of the surrounding environment. [0003] Local surface plasmon resonance sensors can be divided into reflection type and transmission type, and transmission type local surface plasmon reso...

AI Technical Summary

Problems solved by technology

Due to its outstanding transparency, polycarbonate can be used as the substrate material of transmissive local surface plasmon resonance sensors, but the solvent resistance of polycarbonate materials is relatively poor, and stress relaxation and cracks are prone to occur under the action of solvents; In addition, the UV aging resistance of polycarbonate materials is poor, and the reaction turns yellow under the irradiation of ultraviolet light, resulting in a decrease in light transmission performance, which cannot meet the detection application requirements of localized surface plasmon resonance sensors.

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