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Synthesis of mono-disperse and highly crystalline nano-particles of metals, alloys, metal-oxides, and multi-metallic oxides without a size-selection process

A technology of metal nanoparticles and nanoparticles, applied in the direction of oxygen/ozone/oxide/hydroxide, metal or alloy, iron oxide/iron hydroxide, etc., can solve the problem of difficult formation of superlattice, poor crystallinity, Problems such as irregular size of nanoparticles can achieve the effect of extending the performance and promoting the possibility of recycling and reuse

Inactive Publication Date: 2005-01-19
(财)国立首尔大学校产学协力财团
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting nanoparticles are irregular in size and poor in crystallinity, making it difficult to form superlattices suitable for magnetic media for data storage

Method used

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  • Synthesis of mono-disperse and highly crystalline nano-particles of metals, alloys, metal-oxides, and multi-metallic oxides without a size-selection process
  • Synthesis of mono-disperse and highly crystalline nano-particles of metals, alloys, metal-oxides, and multi-metallic oxides without a size-selection process
  • Synthesis of mono-disperse and highly crystalline nano-particles of metals, alloys, metal-oxides, and multi-metallic oxides without a size-selection process

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Embodiment approach 1

[0054] Embodiment 1: Synthesis of monodisperse spherical iron nanoparticles

[0055] As a first exemplary embodiment of the synthesis of monodisperse spherical iron nanoparticles according to the present invention, 0.2 ml of iron pentacarbonyl [Fe(CO) 5 ] was added to a mixture containing 10 ml of dehydrated octyl ether and 1.25 g of oleic acid, and the resulting mixture was heated at 110° C. to obtain an iron-oleic acid complex, and the resulting reaction mixture was heated to reflux and aged at reflux temperature 1 hour. During this treatment, iron pentacarbonyl [Fe(CO) 5 ] complete thermal decomposition, resulting in iron atoms. The resulting solution was cooled to room temperature, and ethanol was added to produce a black precipitate, which was then separated by centrifugation. The resulting supernatant was removed. After this cleaning process was repeated at least three times, ethanol contained in the residue was removed by vacuum drying. The resulting product was ea...

Embodiment approach 2

[0056] Embodiment 2: Synthesis of monodisperse spherical iron oxide nanoparticles-1

[0057] Similar to the method described in Embodiment 1 above, in order to synthesize the monodisperse spherical iron oxide nanoparticles with a diameter of 7 nm of the present invention, 0.2 ml of iron pentacarbonyl [Fe(CO) 5 ] was added to a mixture containing 10 ml of dehydrated octyl ether and 1.25 g of oleic acid, and the resulting mixture was heated at 110° C. to form an iron-oleic acid complex. The resulting reaction mixture was heated to reflux and aged at reflux temperature for 1 hour. In this process, iron pentacarbonyl [Fe(CO) 5 ] complete thermal decomposition, resulting in iron atoms. In order to obtain monodisperse spherical iron oxide (maghemite, γ-Fe 2 o 3 ) nanoparticles, and the resulting red solution was cooled to room temperature. Then, 0.36 g of the oxidant trimethylamine N-oxide was added, and the resulting black mixture was heated to 300° C. and maintained at this t...

Embodiment approach 3

[0058] Embodiment 3: Synthesis of monodisperse spherical iron oxide nanoparticles-2

[0059] The same reaction conditions as described in Embodiment 2 were used to synthesize monodisperse spherical metal oxide nanoparticles with a diameter of 7 nm, except that the amount of surfactant used was reduced to 0.85 g. Figure 8 An exemplary TEM image of 7nm spherical iron oxide nanoparticles synthesized according to the present invention is shown, which shows that the 7nm spherical iron oxide nanoparticles are monodisperse.

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Abstract

A synthetic method of fabricating highly crystalline and monodisperse nanoparticles of metals, multi-metallic alloys, monometallic oxides and multi-metallic oxides without a size selection process are disclosed. A typical synthetic method comprises the steps of, synthesis of a metal surfactant complex from the reaction of a metal precursor and a surfactant, high temperature thermal decomposition of the metal surfactant complex to produce monodisperse metal nanoparticles, and completing the formation of synthesized metal, metal alloy or metal oxide nanoparticles by adding a poor solvent followed by centrifuging. For obtaining highly crystalline monodisperse nanoparticles, additional steps are necessary as described in the invention. The resulting nanoparticles have excellent magnetic property for many applications.

Description

technical field [0001] The invention relates to a method for synthesizing highly crystalline monodisperse nanoparticles of metals, multimetal alloys, single metal oxides and multimetal oxides without size selection treatment. Background technique [0002] The emergence of uniform nanoparticles has had an important impact on many different technical fields such as high-density magnetic data storage elements, high-density single-electron transistor devices, and high-efficiency laser beam sources. These nano-sized particles possess novel and interesting electrical, magnetic and optical properties compared to existing widely known particles with sizes larger than the micrometer range. [0003] The surface properties of nanoparticle materials are critical because nanoparticles have a high surface area to volume ratio and a high surface defect ratio compared to bulk materials. Furthermore, the quantum confinement effect of nanoparticles with dimensions between those of molecular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B22F1/054B22F9/30B82B3/00C01B13/36C01G51/00G11B5/706G11B5/714G11B5/842H01F1/00
CPCC01P2006/42C01P2004/64H01F1/0045B82Y25/00H01F1/0054C01B13/366C01P2004/04B22F2998/00C01B13/36H01F1/009B82Y30/00B22F1/0018G11B5/70605B22F9/305C01P2004/52C01P2004/32B22F1/054B82B3/00B82Y40/00G11B5/714
Inventor 玄泽焕
Owner (财)国立首尔大学校产学协力财团
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