Chiral nano film and preparation method and application thereof

A nano-film and chiral technology, applied in the field of nano-materials, can solve the problems of long-range disorder of chiral nano-materials, limit practical applications, weak optical activity, etc., and achieve the effect of controllable structure, simple method and simple operation

Inactive Publication Date: 2017-06-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the top-down microfabrication method, the bottom-up method is based on the solution method, which is relatively low in cost and suitable for large-scale applications. However, the chiral nanomaterials obtained by these methods are long-range disordered and optically active. Very weak, generally more than an order of magnitude smaller than the optical activity of chiral materials obtained by microfabrication methods, which greatly limits their practical applications

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  • Chiral nano film and preparation method and application thereof
  • Chiral nano film and preparation method and application thereof
  • Chiral nano film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of ultrafine gold nanowires:

[0047] Add 40 mg of chloroauric acid (HAuCl 4 4H 2 (0), then add 40mL hexane and 1.358mL oleylamine successively, after the chloroauric acid is completely dissolved, add 1.886mL triisopropylsilane (TIPS). After mixing evenly, place it in a water bath at 30°C for 24 hours. After the reaction was completed, ethanol was added at a volume ratio of 1 / 2 of ethanol / hexane, centrifuged at 4500 rpm for 15 minutes, and the precipitate was dispersed in 1 mL of chloroform to obtain a colloidal solution of gold nanowires.

[0048] (2) Preparation of chiral thin film:

[0049] Add ethylene glycol into the Langmuir-Blodgett tank (LB tank) until the liquid level is about 2 mm above the edge of the tank, and spread the gold nanowire colloid solution obtained in step (1) onto the surface of ethylene glycol with a 50 μL microsyringe , The sample drop position is selected in the center of the LB tank. After dripping the sample, let it sta...

Embodiment 2

[0055] (1) Preparation of ultrafine tungsten oxide nanowires

[0056] Add 200 mg of WCl to 15 mL of benzyl alcohol with stirring 6 , after the solution turned blue, 1 mL of oleylamine was added. Stirring was continued for 30min, and then the solution was transferred to a 50mL polytetrafluoroethylene reactor. React at 180°C for 24h. Then cool to room temperature, centrifuge at 8000 rpm for 5 min to collect the precipitate, and then wash twice with acetone, chloroform and ethanol respectively. Finally, 16 mL of chloroform and 4 mL of oleylamine were added to the precipitate, and the solution was sonicated for 2 h until it became a transparent solution. Finally, it was washed three times with chloroform and ethanol, and finally dispersed in 20 mL of chloroform to obtain a colloidal solution of tungsten oxide nanowires.

[0057] (2) Preparation of chiral thin film:

[0058] Add ethylene glycol to the LB tank until the liquid level is about 2 mm above the edge of the tank, use...

Embodiment 3

[0061] (1) Preparation of ultrafine nickel molybdate nanowires

[0062] Mix 6mL ethanol, 2mL oleylamine and 1mL oleic acid in a 20mL polytetrafluoroethylene reactor under stirring, then add 0.3mL 1M NiCl 2 aqueous solution and 0.3 mL of 1M NaMoO 4 Aqueous solution, continued to stir for 10min, and then reacted at 140°C for 4h. After cooling to room temperature, the product was dispersed in 10 mL of hexane, then added to 20 mL of ethanol for precipitation, and centrifuged at 8000 rpm for 5 min. Finally, the precipitate was dispersed in 20mL of hexane to obtain a nickel acid nanowire colloidal solution;

[0063] (2) Preparation of nickel molybdate nanowire chiral thin film

[0064] Add ethylene glycol into the LB tank until the liquid level is about 2 mm above the edge of the tank, take 100 μL of the nickel molybdate nanowire colloid solution obtained in step (1) twice with a 50 μL micro-syringe and spread it on the surface of ethylene glycol, drop The sample position is sel...

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Abstract

The invention provides a chiral nano film and a preparation method and application thereof. The preparation method of the chiral nano film comprises the steps that a one-dimensional nanomaterial solution is spread on a lower phase in a Langmuir-Blodgett groove, a slide barrier located on the surface of the lower phase pushes a one-dimensional nanomaterial to move on the surface of the lower phase after the solvent is completely volatilized, the area of the one-dimensional nanomaterial is compressed to obtain a one-dimensional nanomaterial assembly film consistent in orientation; a Langmui-Schaeffer transfer method is adopted to transfer the assembly film to a substrate, and the chiral film provided with at least two layers of assembly films is obtained, wherein the assembly films are sequentially staggered clockwise or anticlockwise. The chiral film has ultra-high optical activity, an anisotropy factor is as high as 0.3, the optical activity is highest compared with chiral materials obtained by adopting an existing assembly means, and the preparation method is simple and has universality and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a chiral nano-film and its preparation method and application, in particular to a method for preparing a chiral nano-film by assembling one-dimensional nano-materials based on Langmuir-Schaeffer technology and the prepared chiral nano-film and its application. Background technique [0002] Chiral materials are widely used in optical devices, asymmetric catalysis, chiral recognition, chiral separation, biomedicine and other fields. In recent years, chiral nanomaterials have received great attention. Compared with chiral molecules, chiral nanomaterials have superior optical activity, making them promising in optical device applications. At present, the methods for preparing chiral nanomaterials are mainly divided into two categories: top-down microfabrication methods and bottom-up self-assembly methods. Various chiral nanostructures with complex shapes and long-range order ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00B82Y30/00B82Y40/00C01G41/02C01G53/00
CPCB82B1/001B82B3/0019B82Y30/00B82Y40/00C01G41/02C01G53/00C01P2002/87C01P2004/16
Inventor 吕家威唐智勇黄岭黄维
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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