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Double-layered nanostructure for regulating circular dichroism and preparation method thereof

A double-layer nanostructure, circular dichroism technology, applied in nanotechnology, nano-optics, nanotechnology, etc., can solve the problem of weak circular dichroism, achieve strong circular dichroism signal, good effect, increase circular dichroism Effects of dichroic signals

Active Publication Date: 2018-06-01
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of relatively weak circular dichroism in the prior art, the present invention provides a double-layer nanostructure that regulates circular dichroism and its preparation method. By moving the position of the metal rod, the circular dichroism signal can be realized. regulation

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  • Double-layered nanostructure for regulating circular dichroism and preparation method thereof
  • Double-layered nanostructure for regulating circular dichroism and preparation method thereof
  • Double-layered nanostructure for regulating circular dichroism and preparation method thereof

Examples

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Embodiment 1

[0056] refer to figure 1 , figure 2 and image 3 , the double-layer nanostructure for regulating circular dichroism is a double-layer chiral structure composed of a plurality of gold nano-units 1 with the same structure up and down, left and right. Gold nano unit 1 comprises upper structure and lower structure, and the lower structure of gold nano unit 1 is made up of a plurality of lower rods, and the upper structure of gold nano unit 1 includes a metal rod 2 and an upper rod 3 positioned at one side of metal rod 2, and the metal The angle between the rod 2 and the upper rod 3 is 90°, the metal rod 2 and the lower rod 4 are placed in parallel, and one end of the lower rod 4 is perpendicular to the end of the upper rod 3 close to the metal rod 2. The metal rod 2, the upper rod 3 and the lower rod 4 are all made of gold material.

[0057] In this embodiment, the distance between the lower structure and the upper structure is 40nm, the length L of the upper rod 3 and the low...

Embodiment 2

[0083] The double-layer nanostructure of this embodiment is different from that of Embodiment 1. The metal rods are arranged in the lower layer, that is, the metal rods and the lower rods are placed in parallel in the same plane, and the distance from the lower rods is 20 nm. The purpose is to compare and place it on the upper layer to see the size of the CD.

[0084] In this embodiment, the distance between the lower structure and the upper structure is 40nm, the length L of the upper rod 3 and the lower rod 4 is 100nm, the width w is 20nm, and the thickness h=20nm, the width D of the metal rod 2 is 20nm, and the metal rod 2 The distance d between 2 and upper rod 3 is 40nm, and the period side length Px=Py of gold nano unit 1 is 300nm.

[0085] In this example, the preparation method of the double-layer nanostructure that regulates circular dichroism is the same as that in Example 1.

[0086] The circular dichroism spectrum figure that this embodiment structure produces is a...

Embodiment 3

[0088] The double-layer nanostructure of this embodiment is different from that of Embodiment 1 and Embodiment 1. The upper and lower rods without metal rods are called the BK model, so the BK model structure is used as a comparative example. The purpose is to verify the change of CD after adding metal rods.

[0089] In this embodiment, the distance between the lower structure and the upper structure is 40nm, the length L of the upper rod 3 and the lower rod 4 is 100nm, the width w is 20nm, and the thickness h=20nm, and the period length Px=Py of the gold nano unit 1 , are 300nm.

[0090] In this example, the preparation method of the double-layer nanostructure that regulates circular dichroism is the same as that in Example 1.

[0091] The circular dichroism spectrum figure that this embodiment structure produces is as Figure 6 . Experimental results show that after adding metal rods, CD increases.

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Abstract

The invention relates to a double-layered nanostructure for regulating circular dichroism and a preparation method thereof. The double-layered nanostructure is a double-layered chiral structure comprising a plurality of gold nano units with the same structure being combined up and down, left and right, and each gold nano unit comprises an upper structure and a lower structure, the lower structurecomprises a lower bar, the upper structure comprises a metal rod and an upper bar located on the side of the metal bar. The angle between the metal bar and the upper bar is 90 degree, the metal bar and the lower bar are placed in parallel, and one end of the lower rod is perpendicular to one end of the upper rod near the metal rod in different surfaces; the preparation method of the double-layerednanostructure comprises the steps of preparing a substrate, coating photoresist, drying after coating, exposing a structure pattern through an electron beam, developing, photographic fixing, drying after photographic fixing, gold plating, stripping PMMA photoresist, blow-drying, plating SiO2 intermediate layer and the like. The circular dichroism produced by the double-layered nanostructure of the invention has a better effect and can also dynamically adjust a circular dichroism signal of the structure.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterials, and in particular relates to a double-layer nanostructure for regulating circular dichroism and a preparation method thereof. Background technique [0002] The word chirality is derived from Greek and means the symmetry of structure, which has important meaning in many disciplines. An object is said to be "chiral" if it is different from its mirror image, and its mirror image cannot be superimposed on the original object, just as the left and right hands are mirror images of each other and cannot be superimposed. Chirality is the basic characteristic of life process, and most of the organic molecules that make up living organisms are chiral molecules. [0003] According to the disclosed technology, circular dichroism (CD, circular dichroism) is a very important means to study chiral compounds, the positive and negative of the Cotton Effect (Cotton Effect) at a specific wavelength and...

Claims

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Application Information

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IPC IPC(8): G03F7/20B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00G03F7/2059
Inventor 王莉王明艳王菲赵文静张中月孙永伟
Owner SHAANXI NORMAL UNIV
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