A chiral metal nanostructure for realizing circular dichroism and its preparation method

Abstract

The invention discloses a chiral metal nanostructure realizing circular dichroism and a preparation method thereof. The preparation method comprises performing evaporation of A and B materials in a rotating alternative manner according to a clockwise or anti-clockwise direction on a template with polystyrene pellets as a substrate, to form an AB alternative helical structure, wherein the A is an insulator material and B is a metal material. Through measurement of light normal incidence and / or oblique incidence, the chiral metal nanostructure is proved to have relatively high circular dichroism. The technical scheme is simple in operation, and more accurate in measuring signals. The chiral metal nanostructure can be applied in biological monitoring, enantiomer sensing, polarization conversion, and photoelectronic circuit polarizers.

Description

Technical field [0001] The invention relates to a chiral metal nanostructure for realizing circular dichroism and a preparation method thereof. [0002] In the field of material chemistry technology. Background technique [0003] The word chirality is derived from Greek, which means the symmetry of structure, and has important meanings in many disciplines. If an object is different from its mirror image, it is called "chiral", and its mirror image cannot coincide with the original object, just as the left hand and right hand are mirror images of each other and cannot be superimposed. Chirality is the basic characteristic of the life process, and most of the organic molecules that make up a living body are chiral molecules. [0004] According to the published technology, circular dichroism (CD, circulardichroism) is a very important method for the study of chiral compounds. The positive and negative of the Cotton Effect at a specific wavelength and the left and right rotation of the...

AI Technical Summary

Problems solved by technology

[0005] Naturally occurring chiral structure, circular dichroism is relatively weak, which is not conducive to wider applications

Due to the stronger interaction between metal and light, metal nanostructures have stronger circular dichroism. , 2542−2547” in metal nanostructures are prepared by using multiple sets of instrument systems in the laboratory, using multiple electron beam exposures to complete the preparation, the chiral structure is cumbersome and expensive; and the preparation time of the electron beam exposure system is long And the sample area is small (30 μm × 30 μm), the 100nm thick Au evaporation in this paper still uses the electron beam vacuum evaporation system (or magnetron sputtering system) to evaporate the metal layer, and the circular dichroism spectrum signal of this structure is relatively Still weak, the spectral signal acquisition method is also limited, the acquisition conditions are harsh, and it is necessary to build an expensive micro-area spectral system for detection

In the document "Yizhuo He, George K.Larsen. Tunable Three-Dimensional Helicically Stacked Plasmonic Layers on Nanosphere Monolayers. NanoLett. 2014, 14, 1976−1981", the circular dichroism is achieved by using normal incidence of light on chiral metal nanostructures, but The way to prepare chiral metal nanostructures is cumbersome and complicated, and the circular dichroism signal of the structures prepared by the method in this paper is weak

Moreover, precious metals such as gold and silver are mostly used in the preparation of metal nanostructures in the prior art, and the cost of realizing circular dichroism is relatively high.

Images