Method for preparing monodisperse cadmium sulfide-silicon dioxide nucleocapsid structure

A technology of silica and core-shell structure, applied in the direction of final product manufacturing, sustainable manufacturing/processing, electrical components, etc., can solve the problems of uncontrollable shell wall thickness, uneven surface coating, impurity aggregation, etc., and achieve enhanced Photonic bandgap characteristics, low-cost methods, and effects of less absorption

Inactive Publication Date: 2006-06-07
ZHEJIANG UNIV
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Problems solved by technology

Recently, someone prepared a composite structure with cadmium sulfide coated on the surface of silica spheres through a single-molecule precursor. However, the composite structure obtained by this method is not monodisperse, and impurities are prone to agglomeration, and the surface coating is not uniform, and the thickness of the shell wall cannot be determined. control

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  • Method for preparing monodisperse cadmium sulfide-silicon dioxide nucleocapsid structure
  • Method for preparing monodisperse cadmium sulfide-silicon dioxide nucleocapsid structure
  • Method for preparing monodisperse cadmium sulfide-silicon dioxide nucleocapsid structure

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Embodiment

[0015] 1) Disperse 300 mg of monodisperse silica spheres with a particle size of 200 nm in 250 ml of deionized aqueous solution by ultrasonic oscillation, add 10 ml of 0.1 mol / L sodium citrate as a complexing agent, and add 15 μl of triethanolamine As a surfactant, and adjust the pH to 11 with ammonia water. Stir at a constant temperature of 60°C with magnetic force, then drop 10 ml of 0.1 mol / L cadmium chloride and 50 ml of 0.04 mol / L thiourea, and react for 2 hours to obtain a suspension of core-shell structure of cadmium sulfide wrapped silica spheres , use deionized water and absolute ethanol to adopt centrifugal deposition and ultrasonic dispersion cycle cleaning to remove reaction residues, and dry at 60°C to obtain a monodisperse cadmium sulfide-silica core-shell structure (such as figure 1 ), it can be seen from the figure that cadmium sulfide is evenly wrapped on the surface of silica, there is no excess cadmium sulfide particles and impurities agglomerated, and the t...

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Abstract

The invention discloses an approach to produce monodisperse cadmium sulphide-silicon dioxide nucleocapsid construction. Adopting chemistry water bath sedimentation, it includes nether steps: 1): Use sonic oscillation to make even monodisperse silicon dioxide sphere disperse into solution of deionized water; add sodium citrate as complexing agent, alkylol amine as surface active agent; use ammonia to adjust PH value to 8-13; magnetic stirring in constant temperature of 50-90deg.C; add cadmium chloride and sulfur to react for 1-3 hours; and then get nucleocapsid construction suspending liquid of cadmium sulphide enwrapping silicon dioxide sphere. 2): Use deionized water and absolute ethyl alcohol to clean circularly; remove reaction remnants and drying. The invention has a low cost and simple process. The produced nucleocapsid construction has a averaging diameter without cadmium sulphide grains and heterocoagulation. It can be used as construction primitive to produce three-dimensional photon crystal with unique band gap performance.

Description

technical field [0001] The invention relates to a method for preparing a cadmium sulfide-silicon dioxide core-shell structure. Background technique [0002] Due to their unique structural, optical, and surface properties, the core-shell structure has recently been widely used in the fields of encapsulation, electronics, photonics, drug delivery, and catalysis. Photonic crystals are artificial microstructures that are arranged in a certain spatial order by materials with different dielectric constants (refractive indices), whose period can be compared with the wavelength of light. As an "optical semiconductor", photonic crystals have a unique function of adjusting the state of light propagation, and have very broad application prospects in the fields of optoelectronic integration, photon integration, and optical communication. Three-dimensional photonic crystals self-assembled from core-shell structures have also received widespread interest from researchers in recent years....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0296H01L31/18C04B35/14C04B35/547C04B35/628
CPCY02P70/50
Inventor 杨德仁谢荣国李东升蒋民华
Owner ZHEJIANG UNIV
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