Synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles

A technology of ferric oxide and nanoparticles, which is applied in the direction of microcapsule preparation and microsphere preparation, can solve the problems of complex reaction process and cumbersome reaction device, and achieve the effect of avoiding complicated process, simple operation and wide application

Inactive Publication Date: 2013-05-08
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of these methods is that the reaction device is loaded down with trivial details, and the reaction process is comparatively complicated.

Method used

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  • Synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles
  • Synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles
  • Synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles

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Embodiment 1

[0015] Example 1: γ-Fe in 30ml solution system 2 o 3 Synthesis of Au nanoparticles

[0016] Weigh 1.08g FeCl 3 ?6H 2 0 and 0.4g FeCl 2 ?4H 2 0 was dissolved in 5ml of water containing 0.172ml of concentrated HCl at a molar ratio of 2:1, and was added dropwise to 50ml of 1.5M NaOH with vigorous stirring. The resulting black precipitate was collected with a magnet, the supernatant was removed, and washed with water for 3 Once, use 100ml 0.01M HCl solution to neutralize the anions on the nanoparticles, collect the precipitate with a magnet, remove the supernatant, wash twice with water, and fresh Fe 3 o 4 Nanoparticles dissolved in 0.01M HNO 3 In the medium, the water bath is heated to boiling and stirred vigorously for 6-8 hours, until it is completely oxidized into γ-Fe 2 o 3 , cooled to room temperature, centrifuged at 6000rpm for 20min to collect the precipitate, washed twice with water and once with 0.1M TMAOH, dissolved in 0.1M TMAOH solution and stored stably for ...

Embodiment 2

[0020] Embodiment 2: γ-Fe in 50ml solution system 2 o 3 Synthesis of Au nanoparticles

[0021] Weigh 1.08g FeCl 3 ?6H 2 0 and 0.4g FeCl 2 ?4H 2 0 was dissolved in 5ml of water containing 0.172ml of concentrated HCl at a molar ratio of 2:1, and was added dropwise to 50ml of 1.5M NaOH with vigorous stirring. The resulting black precipitate was collected with a magnet, the supernatant was removed, and washed with water for 3 Once, use 100ml 0.01M HCl solution to neutralize the anions on the nanoparticles, collect the precipitate with a magnet, remove the supernatant, wash twice with water, and fresh Fe 3 o 4 Nanoparticles dissolved in 0.01M HNO 3 In the medium, the water bath is heated to boiling and stirred vigorously for 6-8 hours, until it is completely oxidized into γ-Fe 2 o 3 , cooled to room temperature, centrifuged at 6000rpm for 20min to collect the precipitate, washed twice with water and once with 0.1M TMAOH, dissolved in 0.1M TMAOH solution and stored stably f...

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Abstract

The invention discloses a synthesis method of small core gold-coated ferric oxide core-shell structure nanoparticles, relating to the technical field of nanomaterials. The method comprises the following steps of: 1) adding an iron salt solution comprising ferrous chloride and ferric trichloride according to the volume ratio of 1: 10 into a NaOH solution, stirring, collecting produced black precipitates by a magnet, washing with water for three times to obtain fresh ferroferric oxide nanoparticles, dissolving in a nitric acid solution, heating and stirring till complete oxidation of gamma-Fe2O3, performing centrifugal collection after the solution is cooled, and washing with the water to obtain the ferric oxide nanoparticles of 3-6nm; and 2) diluting with the water till 1.1mM, adding sodium citrate, stirring, and alternately adding hydroxylamine hydrochloride and 1% of chloroauric acid for five times sequentially. The synthesis method has the beneficial effects that the method is simple to operate, the preparation conditions are mild, and the complex process of a conventional preparation method is avoided. Compared with single ferric oxide nanoparticles, the small core gold-coated ferric oxide core-shell structure nanoparticles have not only various properties of the ferric oxide nanoparticles, but also higher stability in comparison with the ferric oxide nanoparticles, and are widely applied to biological imaging, biosensing, biological identification and surface-enhanced Raman technologies.

Description

technical field [0001] The invention relates to the technical field of core-shell structure nanomaterials. Background technique [0002] Nanotechnology has been successfully used in many fields, including medicine, pharmacy, chemical and biological detection, manufacturing, optics and national defense, etc., and can be applied to people's basic necessities of life. In recent years, nanomaterials have become a research hotspot in nanoscience, especially core-shell nanomaterials. Core-shell nanoparticles have the advantages of two layers of different materials, the core and the shell. By complementing the properties of the two materials, core-shell nanomaterials have broader application prospects than single-material nanoparticles. For small core gold-encapsulated iron oxide core-shell nanoparticles, the iron oxide core has a wide range of applications as a magnetic material, including labeling of ferrofluids and sorting of biological species, biomedical imaging, site-specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 何秀霞王振新于源华王博闻
Owner CHANGCHUN UNIV OF SCI & TECH
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