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Method for preparing silicon core and golden shell nanoparticles by ultrasonic-assisted hydroxylamine hydrochloride seed-growth method

A hydroxylamine hydrochloride, nanoparticle technology, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of uneven seed adsorption, and achieve a light weight and high electron density that is not easy to be oxidized. Effect

Inactive Publication Date: 2019-10-01
ACADEMY OF MILITARY MEDICAL SCI
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  • Application Information

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Problems solved by technology

This method makes full use of the strong positive charge characteristics of the PEI layer on the surface of silicon spheres, and can evenly adsorb negatively charged gold seeds through electrostatic interaction, which essentially solves the problem of uneven seed adsorption in the traditional seed growth method, making silicon core gold shell nano Materials can achieve high efficiency, stability and mass production

Method used

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  • Method for preparing silicon core and golden shell nanoparticles by ultrasonic-assisted hydroxylamine hydrochloride seed-growth method
  • Method for preparing silicon core and golden shell nanoparticles by ultrasonic-assisted hydroxylamine hydrochloride seed-growth method
  • Method for preparing silicon core and golden shell nanoparticles by ultrasonic-assisted hydroxylamine hydrochloride seed-growth method

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Effect test

Embodiment 1

[0025] Preparation of 150nm silicon-core-gold-shell nanoparticles by ultrasonic-assisted polyethyleneimine-mediated hydroxylamine hydrochloride seed growth method:

[0026] figure 1 Schematic illustration of the preparation process for the preparation of silicon-core-gold-shell nanoparticles by the ultrasound-assisted polyethyleneimine-mediated seed growth method. The specific preparation method is as follows:

[0027] In the first step, 150nm SiO was synthesized by the improved Stober method 2 nanospheres. Take a 200ml jar, add 100ml of absolute ethanol, 6ml of deionized water, 4ml of 28% ammonia water in sequence, stir at room temperature for 20min, then add 4ml of TEOS, and continue stirring for 6h. After the reaction, the white SiO was concentrated by centrifugation 2 The precipitate was washed twice with absolute ethanol, and finally concentrated by centrifugation and stored in 40ml ethanol for later use.

[0028] In the second step, 150nm SiO 2 The cationic polymer...

Embodiment 2

[0037] SERS performance characterization of silicon core gold shell nanoparticles:

[0038] In this experiment, the commonly used Raman molecule 5,5′-dithiobis(2-nitrobenzoic acid) (DTNB) was used to characterize the SERS performance of silicon-core gold-shell nanospheres. There are mercapto groups on the surface of DTNB, which can generate enhanced Raman signals when combined with gold or silver materials. First configure different concentrations of DTNB (10 -3 -10 -7 ) solution, and then sequentially added to the prepared silicon-core-gold-shell nano-microsphere solution, and ultrasonicated for 40 minutes to combine DTNB with the silicon-core-gold-shell nanomaterial. After centrifugation, the supernatant was discarded, and the precipitated nanoparticles were concentrated in water and dropped on a clean silicon chip. After drying, the slow signal was detected. At the same time, the surface of prepared gold shells with different thicknesses was modified with the same concen...

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Abstract

The invention discloses a method for preparing silicon core and golden shell nanoparticles by an ultrasonic-assisted hydroxylamine hydrochloride seed-growth method. According to the method, the hydroxylamine hydrochloride seed-growth method and an ultrasonic chemistry method are combined; a silicon dioxide nanoparticle is taken as the core by each prepared silicon core and golden shell composite nanoparticle; the surface of each silicon dioxide nanoparticle is modified with polyethyleneimine (PEI) under the ultrasonic condition, and self-assembly is performed by PEI on the surface of the corresponding silicon dioxide nanoparticle to form a cationic polymer; electronegative small-particle size metal nanoparticles are adsorbed to serve as a seed structure by utilizing powerful electropositivity of a PEI layer through an electrostatic method; and finally, a layer of continuous and full golden shell is formed on the surface of each silicon dioxide nanoparticle by employing the ultrasonic-assisted seed-growth method.

Description

technical field [0001] The invention relates to the field of synthesis of nanometer materials, specifically preparing silicon core gold shell nanoparticles through a hydroxylamine hydrochloride seed growth method and a sonochemical method. Background technique [0002] Gold nanomaterials have high electron density, dielectric properties and catalysis, and can be combined with a variety of biological macromolecules without affecting their biological activity. They have been widely used in the fields of surface-enhanced Raman scattering, biosensing and catalysis. The silica microspheres prepared by the improved storbe method have uniform size, simple preparation method, low cost and extremely high monodispersity, which provide favorable conditions for further coating of other materials. After the silica microspheres are coated with gold nanoshells, the gold nanoparticles in the outer shell have strong surface plasmon resonance characteristics and nonlinear optical absorption c...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C01B33/18B82Y30/00
CPCB22F9/24C01B33/18B82Y30/00B22F2009/245C01P2004/64C01P2004/62B22F1/054
Inventor 王升启肖瑞王柯莉荣振汪崇文郄志伟
Owner ACADEMY OF MILITARY MEDICAL SCI
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