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Preparation method of crack-free optical crystal

A photonic crystal, crack-free technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of cumbersome process, high preparation cost, unsafe hazards, etc., and achieve good universality, simple operation, low cost effect

Active Publication Date: 2012-05-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are the following disadvantages in the above-mentioned preparation process: 1. The prepared product can only avoid the generation of cracks on some low bulk density crystal planes, while other high bulk density crystal planes still have cracks; 2. The preparation cost is high , the process is cumbersome; 3. The preparation process is seriously polluted and has potential safety hazards; 4. The preparation method is only applicable to certain colloidal particles and is not universal
Related work has not been reported in the literature

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  • Preparation method of crack-free optical crystal

Examples

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Effect test

Embodiment 1

[0024] Monodisperse poly(styrene-methyl methacrylate-acrylic acid) polymer colloidal microspheres with a particle size of 80 nm were ultrasonically dispersed in water to form an emulsion with a mass fraction of 0.01%, and then an aluminum foil with a thickness of 0.001 cm was vertically Put it into the emulsion, under the condition that the temperature is 50°C and the relative humidity is 50%, the above-mentioned monodisperse colloidal microspheres are assembled on the surface of the above-mentioned aluminum foil by utilizing the capillary pressure of the meniscus of water formed on the surface of the aluminum foil, and the self-assembly A large-area opal structure photonic crystal without cracks is formed, and its photonic band gap is located at 200nm.

Embodiment 2

[0026]Monodisperse polystyrene colloidal microspheres with a particle size of 1100nm were ultrasonically dispersed in water to form an emulsion with a mass fraction of 20%, and then an aluminum foil with a thickness of 0.07cm was vertically placed in the emulsion at a temperature of 85°C. Under the condition of a relative humidity of 85%, the above-mentioned monodisperse colloidal microspheres are assembled on the surface of the above-mentioned aluminum foil by using the capillary pressure of the meniscus of water formed on the surface of the aluminum foil, and self-assemble into a large-area opal structure photonic crystal without cracks. The bandgap is located at 2500nm.

Embodiment 3

[0028] Monodisperse silica colloidal microspheres with a particle size of 300nm are ultrasonically dispersed in water to form an emulsion with a mass fraction of 0.5%, and then a polyimide film with a thickness of 0.0075cm is vertically placed in the emulsion, at temperature Under the condition of 60 ℃ and relative humidity of 60%, the above-mentioned monodisperse colloidal microspheres are assembled on the surface of the above-mentioned polyimide film by utilizing the capillary pressure of the meniscus of water formed on the surface of the polyimide film, self-assembly A large-area opal structure photonic crystal without cracks is formed, and its photonic band gap is located at 800nm.

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Abstract

The invention relates to a preparation method of a crack-free large-area optical crystal, in particular to a preparation method of a crack-free large-area opal structure and an inverse opal structural optical crystal. A support substrate of the optical crystal selected in the invention is a hydrophilic flexible substrate, and the crack-free large-area opal structure or a composite opal structural optical crystal can be obtained by performing self-assembly on monodispersed colloid particles on the support substrate or performing co-assembly and polymerization on the monodispersed colloid particles and a water-soluble polymer monomer on the hydrophilic flexible substrate. A crack-free large-area inverse opal structural optical crystal can be obtained by further dissolving the monodispersed colloid particles in the composite opal structural optical crystal. The preparation method related to the invention has the advantages of low cost, easiness for operating, environmental friendliness and high generality. The prepared optical crystal can be practically applied to the fields of high-performance optical devices, chemistry, biochemical detection, and the like.

Description

technical field [0001] The invention relates to a preparation method of a crackless large-area photonic crystal, in particular to a preparation method of a crackless large-area opal structure and an inverse opal structure photonic crystal. Background technique [0002] Since the advent of photonic crystals in 1987, due to their special light regulation properties, they have broad application prospects in optics, electronics, chemistry, biochemistry and other fields. The use of chemical self-assembly to prepare photonic crystals has attracted the interest of scientific researchers due to its low cost and simple operation. However, the inevitable defects such as cracks in the process of preparing photonic crystals by chemical self-assembly severely limit the practical application of photonic crystals. In order to solve this problem, scientists have carried out some preliminary work, such as using template-assisted self-assembly (C.J.Jin, N.P.Johnson, Nano Lett.2005, 5, 2646-2...

Claims

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Application Information

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IPC IPC(8): C30B29/58B01J13/00
Inventor 周金明王京霞宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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