A two-dimensional chiral metal-medium nanostructure and its preparation method

Abstract

The invention relates to the technical field of metal nanomaterials and particularly discloses a two-dimensional chiral metal-medium nanometer structure and a preparation method thereof. According to the structure, a metal material is subjected to evaporation on a mold plate with polystyrene spheres as a base; then 90-degree clockwise rotation is performed; the metal material is subjected to evaporation again; and after evaporation of the metal material is completed, an insulating material is subjected to evaporation, and the L-shaped two-dimensional chiral metal-medium nanometer structure is formed. According to the two-dimensional chiral metal-medium nanometer structure prepared through the method, the two-dimensional chiral metal-medium nanometer structure has larger circular dichroism compared with that no insulating material medium layer exists; the preparation method is simple, cost is low, a light normal incidence method is adopted for measurement, and a measurement signal is more accurate; meanwhile, the two-dimensional chiral metal-medium nanometer structure can serve as a high-sensitivity biosensor device; and when the two-dimensional chiral metal-medium nanometer structure serves as a Raman substrate, the Raman scattering signal can be enhanced.

Description

technical field [0001] The invention relates to the technical field of metal nanomaterials, in particular to a two-dimensional chiral metal-medium nanostructure and a preparation method thereof. Background technique [0002] Chirality refers to the property that a structure cannot coincide with its mirror image structure. Circular dichroism is a method for detecting chiral structures. Circular dichroism refers to the absorption of left-handed circularly polarized light and right-handed circularly polarized light by a chiral structure. different nature. Chiral structures are ubiquitous in nature, and chirality plays a key role in biochemistry and life evolution. Generally, the circular dichroism of chiral molecules is in the ultraviolet band and is very weak, which requires a high concentration of the chiral molecule solution during chiral analysis, which is not conducive to the actual signal detection of biomedicine and pharmaceuticals. However, the artificial chiral metal...

AI Technical Summary

Problems solved by technology

However, the preparation of the three-dimensional chiral structure is complicated, expensive and time-consuming; the circular dichroism of the two-dimensional planar chiral metal structure is relatively weak; the spectral line of the two-dimensional achiral structure will broaden under the condition of oblique incidence, making the measurement inaccurate; these three Both methods are not conducive to wide application in practice

However, the method of adding a dielectric layer to some metals of the two-dimensional planar chiral metal structure to achieve enhanced circular dichroism through the normal incidence of light has not been reported at home and abroad.

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