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Controllable preparation method for Au@SiO2 nano-composite material with ultra-thin shell

A nanocomposite material, ultra-thin technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of limited surface interaction, unfavorable reactant penetration, great influence on the performance of core-shell materials, etc., to achieve regular shape and good spectrum Performance, Ease of Ultrasonic Dispersion

Inactive Publication Date: 2015-09-02
UNIV OF JINAN
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Problems solved by technology

SiO 2 The thickness of the layer has a great influence on the performance of the core-shell material, and the thicker SiO 2 Although the shell can protect the central nanoparticles, it will inhibit the properties of the core nanomaterials such as spectra; in addition, the thicker SiO 2 The shell is also not conducive to the penetration of reactants into it, limiting its surface interaction with the core material, which is unfavorable in some application fields (such as catalysis)

Method used

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  • Controllable preparation method for Au@SiO2 nano-composite material with ultra-thin shell
  • Controllable preparation method for Au@SiO2 nano-composite material with ultra-thin shell
  • Controllable preparation method for Au@SiO2 nano-composite material with ultra-thin shell

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[0024] All reagents used were conventional medicines purchased from reagent companies. Preparation of aqueous solution: 18 megohm deionized water: polydimethyldiallyl ammonium chloride PDDA, (400,000) made into 1.25 mol / L aqueous solution, chloroauric acid (HAuCl 4 ) into a 1.0 mol / L aqueous solution, and L-arginine into a 0.02 mol / L aqueous solution.

[0025] The experimental content of the present invention will be further described in detail below in conjunction with specific implementation examples.

[0026] 1. Preparation of Gold Octahedral Nanoparticles

[0027] Add 1 mol / L HAuCl to the glass vial 4 Solution 35 μL, then pour 70 mL ethylene glycol, and then add 1.40 mL polydimethyldiallylammonium chloride (PDDA) (400,000, 1.25 mol / L), the final concentration of each component in the system: HAuCl 4 : 0.50 mmol / L, PDDA: 25 mmol / L. After the above solution was fully mixed, it was placed in an oil bath at 220°C for two hours, and finally cooled to room temperature. T...

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Abstract

The invention relates to a controllable preparation method for Au@SiO2 core shell nano-material with an ultra-thin shell structure. The controllable preparation method for the Au@SiO2 core shell nano-material with the ultra-thin shell structure mainly solves the problem that SiO2 is difficult to coat gold nano-particles modified by PDDA. The shell thickness of the coated Au@SiO2 core shell nano-material can be controlled through the MPTS amount, reaction time and the like parameters. The prepared Au@SiO2 core shell nano-particles are regular in shape and uniform in shell thickness, and the thickness can be controlled at 5 to 20 nanometers. The Au@SiO2 core shell nano-material with the ultra-thin shell structure has potential application value for the catalyzing, bio-sensing and the like, and more choices are provided for the template material for preparing multi-structure and multi-functional special nano-material.

Description

technical field [0001] The invention relates to an AuSiO with an ultra-thin shell structure 2 A method for the controllable preparation of nanocomposites. Background technique [0002] In recent years, gold nanoparticles with different morphologies have exhibited special properties in optics and electricity, making them useful in surface plasmon optics, surface-enhanced Raman scattering (SERS), chemical and biological sensing, and biomedical detection. Different fields have shown promising application value. Because of their high specific surface area, gold nanoparticles often have high surface energy, which makes them less stable and prone to changes such as agglomeration and morphology etching. At present, preparing gold nanoparticles into a stable core-shell structure is a technical method often used to maintain its stability. Among many alternative shell materials, SiO 2 It is widely used as cladding material because of its relatively good stability and material comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24C01B33/12
Inventor 刘其生李村成孙一强
Owner UNIV OF JINAN
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