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Two-dimensional colloidal crystal film and preparation method thereof

A two-dimensional colloid and crystal film technology, applied in the field of nanomaterials, can solve the problems of uneven thickness, no enhancement of luminous performance, and insufficient density of single-layer films, and achieve the effect of rapid preparation method and good universality

Inactive Publication Date: 2017-07-07
BEIJING NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the self-assembly of rare earth hydroxide nanosheets into fluorescent films except for the monolayer film of layered rare earth hydroxide crystallites fabricated at the hexane / water interface by Hu Linfeng et al.
Moreover, the single-layer film produced by Hu Linfeng et al. is not dense enough, the thickness is not uniform, and the luminescence performance is not enhanced compared with the layered rare earth hydroxide precursor.

Method used

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  • Two-dimensional colloidal crystal film and preparation method thereof
  • Two-dimensional colloidal crystal film and preparation method thereof
  • Two-dimensional colloidal crystal film and preparation method thereof

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preparation example Construction

[0031] The invention provides a method for preparing a two-dimensional colloidal crystal film, which may include:

[0032] (1) obtaining a colloidal suspension of layered rare earth hydroxide nanosheets;

[0033] In a specific embodiment, the rare earth element in the layered rare earth hydroxide nanosheets can be europium, terbium and / or dysprosium, and in another specific embodiment, the layered rare earth hydroxide can be ten Dialkyl sulfate (DSˉ) intercalated rare earth terbium hydroxide, referred to as DSˉ-LTbH. The preparation method of layered rare earth hydroxide and the method of dispersing it into nanosheet colloidal suspension have been reported in the prior art, for example in the literature Yushuang Zhao; Ji-Guang Li; Mengxi Guo; Xiaojing Yang, Structural DS — LTbH (DSˉ intercalated rare earth terbium hydroxide), DS -- The preparation method of LEuH (DS-intercalated rare earth europium hydroxide) and its dispersion into nanosheet colloidal suspension. The pres...

Embodiment 1

[0042] Embodiment 1DSˉ-LTbH and the preparation of its nanosheet suspension

[0043] 1), the preparation of DSˉ-LTbH

[0044] 0.453g (1mmol) Tb (NO 3 ) 3 ·6H 2 O, 0.8651g (3mmol) SDS (sodium dodecyl sulfate) and 0.1402g (1mmol) HMT (hexamethylenetetramine) were added to a 100mL hydrothermal reaction kettle, and 80mL exhaust water was added, and after stirring , sealed and placed in an oven, kept at 90-120°C for 9-12 hours, cooled to room temperature, centrifuged at 10,000-15,000 rpm for 3-5 minutes, and the obtained precipitate was washed 3 times with degassed water and 2 times with absolute ethanol, and then 25- Dry at 40°C for 12 hours to obtain DSˉ-LTbH powder.

[0045] 2), preparation of suspension of DSˉ-LTbH nanosheets

[0046] Disperse 0.1 g of the above-prepared DSˉ-LTbH powder in a conical flask filled with 50 ml of formamide, pass N 2 20 minutes. Then seal the Erlenmeyer flask and keep it in a 40°C incubator for 3 days to obtain a colloidal suspension of DSˉ-...

Embodiment 2

[0047] The preparation of embodiment 2 colloidal spheres

[0048] 1) Preparation of spherical core

[0049] Add 0.2g polystyrene nanospheres (particle size 980nm, manufacturer and model of Shanghai Huizhi Biotechnology Co., Ltd.) into 50mL aqueous solution of polyallylamine hydrochloride (the concentration of polyallylamine hydrochloride is 1g / L), stirred for 40 minutes, and after filtering through a microporous membrane, the solid product was washed 3 times with ultrapure water; then the solid product was placed in an aqueous solution of 50mL sodium polystyrene sulfonate (polystyrene The concentration of sodium sulfonate is 1 g / L), stirred for 40 minutes, filtered through a microporous membrane (0.45 μm), washed 3 times with ultrapure water, and the spherical core can be obtained.

[0050] 2), preparation of colloidal spheres

[0051] 0.1 g spherical core was immersed in 50 mL, 2 mg / mL suspension of DSˉ-LTbH nanosheets and mechanically stirred for 45 minutes to promote the ...

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Abstract

The embodiment of the invention provides a two-dimensional colloidal crystal film and a preparation method thereof, wherein the preparation method of the two-dimensional colloidal crystal film comprises the following steps: (1) acquiring a colloidal suspension of layered rare earth hydroxide nanosheets; (2) acquiring a sphere core, wherein the sphere core is polystyrene nanosphere with the surface sequentially covered with cationic type polyelectrolyte and anionic type polyelectrolyte; (3) mixing and stirring the acquired sphere core with the colloidal suspension of layered rare earth hydroxide nanosheets, so as cause the layered rare earth hydroxide nanosheets to be adsorbed on the surface of the sphere core, then filtering and washing to obtain a colloidal sphere with a core-shell structure; (4) dispersing the colloidal sphere into a solvent to obtain a colloidal sphere dispersing liquid; and (5) soaking a substrate into the colloidal sphere dispersing liquid, and drying the substrate after liquid in the colloidal sphere dispersing liquid is evaporated to be dry, thus forming a two-dimensional colloidal crystal film on the surface of the substrate. The prepared two-dimensional colloidal crystal film is uniform and compact, and has a fluorescence emission performance.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a luminescent two-dimensional colloidal crystal film and a preparation method thereof. Background technique [0002] Two-dimensional colloidal crystals (2D-CC) are self-assembled from a single layer of colloidal particles into periodic two-dimensional nanostructure arrays, also known as two-dimensional colloidal crystal films; their arrangement is usually in the state of minimum system energy, such as hexagonal close packing Or face-centered cubic packing state. Two-dimensional colloidal crystals have attracted widespread attention due to their high reproducibility and low cost, and they have broad application prospects in the fields of biochemical sensing and photovoltaics due to their pattern-dependent properties. [0003] In recent years, compared with the reports of using two-dimensional colloidal crystals as templates to fabricate multifunctional nanocomposites,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C03C17/00B05D7/24
CPCB05D7/24B05D2201/02B05D2203/30B05D2203/35C01F17/206C01P2004/03C01P2004/32C01P2004/50C01P2004/52C01P2004/61C01P2006/60C03C17/009C03C2218/111
Inventor 杨晓晶王新颖
Owner BEIJING NORMAL UNIVERSITY
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