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Chiral nanorod film with circular polarization fluorescence

A nanorod and circular polarization technology, applied in the fields of nanomaterials and optics, can solve the problems of inaccurate prediction of CPL activity of chiral luminophores, cumbersome synthesis process, etc., and achieve the effects of easy control of structure and good film formation.

Active Publication Date: 2021-12-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to obtain inorganic CPL active materials, it is usually necessary to introduce a complex synthesis process such as chiral reagents on prefabricated nanomaterials.
This construction method has a relatively tedious synthesis process, and the CPL activity of the obtained chiral luminophore cannot be accurately predicted

Method used

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  • Chiral nanorod film with circular polarization fluorescence
  • Chiral nanorod film with circular polarization fluorescence
  • Chiral nanorod film with circular polarization fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of embodiment 1CdSe / CdS nanorod film

[0037] In this example, a CdSe / CdS nanorod film was prepared using a film pulling machine, and the specific preparation steps are as follows:

[0038] (1) Disperse the CdSe / CdS nanorods in n-hexane to obtain a 3 mg / mL dispersion, and add 600 microliters of the dispersion dropwise to the surface of ethylene glycol in the film pulling machine tank;

[0039] (2) Compress the sliding barrier from both sides to the middle at a speed of 1 mm / s until the surface pressure is 30 mN / m, forming a nanorod film on the surface of the water phase;

[0040] (3) The nanorod film was horizontally transferred to a clean quartz plate, and dried at 65° C. to obtain a CdSe / CdS nanorod film.

[0041] The prepared CdSe / CdS nanorod film was characterized by transmission electron microscopy, as shown in figure 2 As shown, the prepared CdSe / CdS nanorod film has a uniform, smooth surface and no defects visible to the naked eye.

Embodiment 2

[0042] Example 2 Preparation of RH45°-1+1 chiral CdSe / CdS nanorod film

[0043] Consistent with the operation of Example 1, prepare a layer of CdSe / CdS nanorod film on the quartz plate, repeat the steps (1) and (2) of Example 1 to form a nanorod film in the aqueous phase, and rotate the quartz plate counterclockwise for 45 °, the nanorod film was transferred to the film-coated surface of the quartz plate, and dried at 65°C to obtain a RH45°-1+1 chiral CdSe / CdS nanorod film.

Embodiment 3

[0044] Example 3 Preparation of LH45°-1+1 chiral CdSe / CdS nanorod film

[0045] Consistent with the operation of Example 1, prepare a layer of CdSe / CdS nanorod film on the quartz plate, repeat the steps (1) and (2) of Example 1 to form a nanorod film in the aqueous phase, and rotate the quartz plate clockwise for 45 °, the nanorod film was transferred to the film-coated surface of the quartz plate, and dried at 65°C to obtain the LH45°-1+1 chiral CdSe / CdS nanorod film.

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Abstract

The invention discloses a chiral nanorod film with circular polarization fluorescence, the chiral nanorod film is formed by sequentially staggering and superposing a plurality of laminations clockwise or anticlockwise, and a preparation method of the chiral nanorod film comprises the following steps: (1) dispersing nanorods in n-hexane, and then dropwise adding to the surface of a water phase in a groove of a film drawing machine; (2) compressing a sliding barrier to the middle at a preset speed to preset surface pressure, and forming a nanorod film on the surface of a water phase; (3) transferring the nanorod film to a carrier by adopting a horizontal film forming mode, and drying; and (4) repeating the operation of the steps (1)-(3) to form a film, transferring, drying and overlapping to obtain the chiral nanorod film with circular polarization fluorescence. According to the method, the uniform and flat large-area chiral nanorod film with a high luminescence asymmetry factor (glum) can be prepared; in addition, the glum value of the chiral nanorod film can be regulated and controlled by controlling the rotation angle of the carrier and the number of layers of the film.

Description

technical field [0001] The invention relates to the fields of nanomaterials and optics, in particular to a chiral nanorod film with circularly polarized fluorescence. Background technique [0002] Chirality is a common feature in nature. Some basic substances that constitute life, such as amino acid molecules are all left-handed, and sugar molecules are all right-handed. These are called chiral phenomena. When a non-racemic chiral luminescent system emits left-handed and right-handed polarized light with a difference in intensity, it is called circularly polarized luminescence (CPL). In recent years, due to their wide application prospects in 3D display, biological coding, asymmetric synthesis, optical information storage or encryption, CPL active materials have attracted great attention from researchers and become a new research hotspot in the field of luminescent functional materials. [0003] The key to constructing CPL materials lies in the chiral arrangement of the lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88
CPCC09K11/883C09K11/025C09K11/02
Inventor 胥传来陈丽静马伟匡华徐丽广孙茂忠郝昌龙刘丽强吴晓玲宋珊珊胡拥明吴爱红胥欣欣郭玲玲
Owner JIANGNAN UNIV
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