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A chiral nanostructure with adjustable circular dichroism and its preparation method

A circular dichroism and nanostructure technology, applied in the field of chiral nanostructure and its preparation, can solve the problems of high cost of precious metal coating materials, inaccurate measurement, broadening of spectral lines, etc., to achieve convenient long-term storage and accurate measurement signals , The effect of reducing material consumption

Inactive Publication Date: 2018-09-25
SHAANXI NORMAL UNIV
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  • Claims
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Problems solved by technology

[0003] According to the published literature reports, the two-dimensional planar chiral metal structure can produce circular dichroism, but the signal is relatively weak; while the two-dimensional achiral structure can produce greater circular dichroism in the case of oblique incidence, but its spectrum Lines broaden, making measurements imprecise; three-dimensional metallic helices or helix-like structures can produce circular dichroism
For example, "Yizhuo He, GeorgeK.Larsen. Tunable Three-Dimensional Helicically Stacked Plasmonic Layers on Nanosphere Monolayers. Nano Lett. 2014, 14, 1976−1981", "Kuwata-Gonokami, Makoto; Saito, Nobuyoshi; Ino, Yusuke. Giant optical activity in quasi-two-dimensional planar nanostructures. PRL. 2005,95", "Wuxing Lu, Jian Wu, QiannanZhu. Circular dichroism from single plasmonic nanostructures with extrinsic chirality. Nanoscale, 2014, 6, 14244", prepared by these three methods The circular dichroism signal generated by the structure can only be regulated by the structural parameters and its shape. In this process, a large amount of precious metal coating materials are required for multiple preparations, resulting in high experimental costs; the preparation process is complex and time-consuming. And the disadvantages such as high cost are not conducive to the wide application in practice
In order to reduce the cost, a dielectric layer is added to the simple three-dimensional structure, the circular dichroism is realized through the normal incidence of light, and the circular dichroism is regulated by the position of the dielectric layer. This method has not been reported at home and abroad.

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Embodiment 1

[0041] A chiral nanostructure with adjustable circular dichroism, the original structure of the structure is L-shaped, there is a gap between the long side and the short side of the L-shaped, the long side of the L-shaped is silver, and the thickness is 50nm; L The short side of the shape is a two-layer structure perpendicular to the long side. The bottom layer is silicon dioxide with a thickness of 20nm, and the upper layer is silver with a thickness of 50nm; SiO2 forms a chiral nanostructure with tunable circular dichroism.

[0042] The preparation method of any one of the above-mentioned chiral nanostructures with adjustable circular dichroism comprises the following steps:

[0043] Step 1, put the template with the polystyrene ball substrate into the vacuum coating machine, and vacuum;

[0044] Step 2, tilting the substrate by 4°, vapor-depositing silver;

[0045] Step 3, after the silver vapor deposition in the step 2 is completed, rotate the substrate by 90°, vapor dep...

Embodiment 2

[0061] A chiral nanostructure with adjustable circular dichroism, the original structure of the structure is L-shaped, there is a gap between the long side and the short side of the L-shaped, the long side of the L-shaped is silver, and the thickness is 300nm; L The short side of the shape is a two-layer structure perpendicular to the long side. The bottom layer is silicon dioxide with a thickness of 40nm, and the upper layer is silver with a thickness of 300nm; SiO2 forms a chiral nanostructure with tunable circular dichroism.

[0062] The preparation method of any one of the above-mentioned chiral nanostructures with adjustable circular dichroism comprises the following steps:

[0063] Step 1, put the template with the polystyrene ball substrate into the vacuum coating machine, and vacuum;

[0064] Step 2, tilting the substrate by 4°, vapor-depositing silver;

[0065] Step 3, after the silver vapor deposition in the step 2 is completed, rotate the substrate by 90°, vapor d...

Embodiment 3

[0072] A chiral nanostructure with adjustable circular dichroism, the original structure of the structure is L-shaped, there is a gap between the long side and the short side of the L-shaped, the long side of the L-shaped is silver, and the thickness is 100nm; L The short side of the shape is a two-layer structure perpendicular to the long side. The bottom layer is silicon dioxide with a thickness of 30nm, and the upper layer is silver with a thickness of 100nm; SiO2 forms a chiral nanostructure with tunable circular dichroism.

[0073] The preparation method of any one of the above-mentioned chiral nanostructures with adjustable circular dichroism comprises the following steps:

[0074] Step 1, put the template with the polystyrene ball substrate into the vacuum coating machine, and vacuum;

[0075] Step 2, tilting the substrate by 4°, vapor-depositing silver;

[0076] Step 3, after the silver vapor deposition in the step 2 is completed, rotate the substrate by 90°, vapor d...

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Abstract

The invention belongs to the technical field of metal nano materials, and particularly relates to a chiral nanostructure with adjustable circular dichroism and a preparation method thereof. A primary structure of the chiral nanostructure is an L-shaped structure, a gap exists between the long edge and the short edge of the L-shaped structure, the long edge of the L-shaped structure is made of metal, the short edge of the L-shaped structure is a two-layer structure perpendicular to the long edge, the bottom layer is made of silicon dioxide, and the upper layer is made of metal; the chiral nanostructure with the adjustable circular dichroism is formed by evaporating a medium layer on the long edge or the short edge of the primary structure, namely, the L-shaped structure. According to the chiral nanostructure with the adjustable circular dichroism and the preparation method thereof, the medium layer is added into a simple three-dimensional structure, the circular dichroism is achieved through a normal incidence mode of light, the circular dichroism is regulated and controlled through the position of the medium layer, and different requirements are met; precious metal material cost is greatly lowered, and the experiment cost is lowered; in addition, the chiral nanostructure is simple in preparation process, low in cost, more accurate in measurement signal due to normal incidence and capable of serving as a high-sensitivity biological sensor.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterials, and in particular relates to a chiral nanostructure with adjustable circular dichroism and a preparation method thereof. Background technique [0002] Chirality refers to the property that a structure cannot coincide with its mirror image structure, and circular dichroism is one way to detect chiral structures. Circular dichroism refers to the property that a chiral structure absorbs left-handed and right-handed circularly polarized light differently. The circular dichroism of chiral molecules in nature is in the ultraviolet band and is very weak, which is not conducive to the actual signal detection of biomedicine and pharmaceuticals. The artificial chiral metal nanostructures have stronger circular dichroism due to their interaction with left-handed and right-handed circularly polarized light, resulting in different surface plasmon resonance modes. Artificial chiral metal nanostru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82B1/00B82B3/00B82Y30/00B82Y40/00C23C14/10C23C14/20C23C14/24
CPCB82B1/001B82B3/0019B82Y30/00B82Y40/00C23C14/10C23C14/20C23C14/24
Inventor 张中月屈瑜
Owner SHAANXI NORMAL UNIV
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