Preparation for external electric field controlled colloid particle self-composing and three-D photon crystal

A technology of colloidal particles and applied electric field, applied in solid-state chemical plating, metal material coating process, coating, etc., can solve the problem of not being able to prepare templates of three-dimensional periodic arrangement long-range ordered structure, long deposition time, efficiency low problems, to achieve the effect of high efficiency, short deposition time and high template quality

Inactive Publication Date: 2002-07-17
NANJING UNIV
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Problems solved by technology

[0004] However, this method has great limitations. When the force of Brownian motion of the microspheres in the suspension is equal to the gravity of the microspheres itself, this method cannot prepare templates with three-dimensional periodic arrangements of long-range o...

Method used

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  • Preparation for external electric field controlled colloid particle self-composing and three-D photon crystal
  • Preparation for external electric field controlled colloid particle self-composing and three-D photon crystal
  • Preparation for external electric field controlled colloid particle self-composing and three-D photon crystal

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Embodiment Construction

[0016] For an example of the method, see figure 1 . Photos are marked with size.

[0017] Electric field strength: 50-500V / cm, the upper electrode 1 is connected to the negative, and the lower electrode 2 is connected to the positive. The connection method is determined according to the positive or negative of the ζ-potential of the microspheres in the suspension. If the 3ζ-potential of the microspheres in the suspension is negative, connect the upper electrode to the negative and the lower electrode to the positive; if the ζ-potential of the microspheres in the suspension is positive, connect the upper electrode to the positive and the lower electrode to the negative. The distance between the upper electrode and the lower electrode is d.

[0018] Substrate material: ITO (Indium Tin Oxide) conductive glass 4 or metal plate.

[0019] Adjustment method of silica equal-diameter microsphere suspension: gradually add tetraethylorthosilicate (TEOS) into ethanol solution containin...

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Abstract

The present invention relates to external-applied electric field controlled colloidal particle self-assembly and preparation method of three-D photon crystal. Said method includes the following steps: firstly, regulating pH value of prepared silicon dioxide isometric microsphere suspension to 4-12, then applying D.C. external electric field in the microsphere suspension, field intensity is 50-500 V/cm, to make microspheres with some specific charge implement orientated deposition on the plate of flat conductive glass under the action of external electric field so as to form the three-D periodicity template with long-range order.

Description

1. Technical field [0001] The invention relates to the preparation of a material, especially a method for controlling the self-assembly of colloidal particles and preparing a three-dimensional photonic crystal by applying a direct-current external electric field, that is, self-assembling silicon dioxide equal-diameter microspheres by applying a direct-current external electric field to prepare a Three-dimensional photonic crystals of silica. 2. Background technology [0002] The research on three-dimensional periodic array long-range ordered photonic crystals not only has important scientific research value, but also has important practical value. Three-dimensional periodic long-range ordered photonic crystals not only have broad application prospects in the field of microelectronics and optoelectronics at the present stage, but also have extremely broad application prospects in the field of photonics in the future. For example, optical communication, optical switch, optica...

Claims

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Application Information

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IPC IPC(8): C23C20/08
Inventor 唐月锋李爱东吴迪陈延峰闵乃本
Owner NANJING UNIV
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