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Method for preparing gradient-controllable colloidal photonic crystal

A colloidal photonic crystal and gradient technology, applied in the field of materials, can solve problems such as difficulty in obtaining photonic modes, and achieve the effect of simple operation and good stability

Inactive Publication Date: 2012-10-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In photonic crystal structures, the acquisition of photonic modes with low group velocities is more difficult due to the higher reflectivity and impedance mismatch of propagation modes due to lower group velocities

Method used

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  • Method for preparing gradient-controllable colloidal photonic crystal
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  • Method for preparing gradient-controllable colloidal photonic crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of hydrophilic silicon chip

[0027] The silicon wafer used is a single crystal silicon wafer (100), cut the silicon wafer to a size of 4cm long and 3cm wide with a glass knife, and put it into a mixed solution of concentrated sulfuric acid (98% by mass fraction) and hydrogen peroxide (30% by mass fraction) (Volume ratio is 7:3) heated to 80°C in a water bath and kept for 5 hours to obtain a hydrophilic silicon wafer; then pour the mixed solution into a waste liquid bottle, and repeatedly wash the obtained hydrophilic silicon wafer with deionized water 3 to 5 times, stored in deionized water for later use.

Embodiment 2

[0028] Embodiment 2: the purification of monomer and initiator

[0029] Put styrene and 10wt% sodium hydroxide aqueous solution into the separatory funnel, shake to make the polymerization inhibitor (hydroquinone) in styrene react with sodium hydroxide to generate the sodium salt of hydroquinone, separate liquid Afterwards, wash repeatedly 3 times until colorless; then wash with distilled water to pH = 7, and remove water with anhydrous sulfuric acid; collect fractions by vacuum distillation, methyl methacrylate and acrylic acid direct vacuum distillation to collect fractions.

[0030] Dissolve ammonium persulfate in deionized water at 40°C, filter and cool the filtrate with ice, and then filter after crystallization, repeat the filter 3 times, and dry it at room temperature for later use.

Embodiment 3

[0031] Embodiment 3: the preparation of diameter 253nm P (St-MMA-AA) microsphere

[0032] Install the electromagnetic stirrer, condenser tube, and nitrogen tube into a 250mL three-necked flask, and add 120mL of deionized water after purging nitrogen to exhaust the air; dissolve 0.42g of ammonium persulfate and 0.8g of ammonium bicarbonate in deionized water; The volume ratio of pressure distillation is 90:5:5 styrene, methyl methacrylate, acrylic acid monomer mixture. After passing nitrogen to remove oxygen, heat up to 70°C in a water bath at a stirring speed of 400rpm, and react stably for 7 hours under a nitrogen atmosphere; after the polymerization is completed, the unpolymerized monomers are volatilized under continuous stirring, and the colloid particles agglomerated in the emulsion are removed by suction filtration. Balls were centrifuged and washed with water three times to remove impurities to obtain P(St-MMA-AA) microspheres with a diameter of 253nm.

[0033]For micr...

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PUM

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Abstract

The invention belongs to the technical field of materials and particularly relates to a method for preparing gradient-controllable colloidal photonic crystal. An improved convection self-assembly method is adopted to prepare polymer colloidal photonic crystal with controllable layer number, and the colloidal photonic crystal with controllable longitudinal gradient is prepared by etching of isotropic oxygen plasmas. The whole process is simple and convenient to operate, low in consumption, clean and high in controllability, and the colloidal photonic crystal with controllable longitudinal gradient has excellent stability. Layer number of the colloidal photonic crystal is controlled by regulating concentration of microsphere dispersion solution and pulling speed, and three-dimensional colloidal photonic crystals with different dimensional gradient structures can be prepared by regulating etching power and etching time in the etching process of isotropic oxygen plasmas. The position of photonic forbidden bands can be adjusted through the gradient structure, so that the gradient-controllable colloidal photonic crystal can be used for fluorescene enhancement, sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a controllable gradient colloidal photonic crystal. Background technique [0002] Photonic crystals can control the transmission of light, similar to how semiconductors control the movement of electrons. In view of the high energy consumption and slow information transmission caused by the thermal effect of semiconductor integrated circuits, the idea of ​​using photons as information carriers has attracted widespread attention from researchers. It is the dream of scientists to design an "integrated optical circuit" similar to an integrated circuit, and eventually develop into photonic industries such as all-optical communication and photonic computers. In the preparation of photonic crystal structures, self-assembly of colloidal microspheres has the characteristics of simple method and low cost. In recent years, colloidal photonic crystals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/06C30B29/58
Inventor 张刚陈俊波黄贺
Owner JILIN UNIV
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