Process of making metal containing iron oxide and iron sulfide based nanoparticle materials
AssigneeInternational Business Machines Corporation
InventorShouheng Sun
Life of this patent
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Abstract
A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200-360° C. is described. The size of the particles can be controlled either by changing the iron salt to acid/amine ratio or by coating small nanoparticles with more iron oxide. Magnetite nanoparticles in the size ranging from 2 nm to 20 nm with a narrow size distribution are obtained with the invention.
Claims19
A process of making an iron oxide coated nanoparticle material comprising:
- mixing nanoparticles with an iron salt, an organic alcohol, an organic acid, and an organic amine in an organic solvent to produce a mixture;
- heating said mixture;
- cooling said mixture to room temperature;
- precipitating a product from said mixture;
- and
- dispersing said product in a solvent to produce a nanocrystal dispersion.
A process of making an iron sulfide nanoparticle material comprising:
- mixing an iron salt with an organic thiol, an organic acid, and an organic amine in an organic solvent to produce a mixture;
- heating said mixture;
- cooling said mixture to room temperature;
- precipitating a product from said mixture;
- and
- dispersing said product in a solvent to produce a nanocrystal dispersion.
A process of making an iron sulfide coated nanoparticle material comprising:
- mixing nanoparticles with a metal salt, an organic thiol, an organic acid, and an organic amine in an organic solvent to produce a mixture;
- heating said mixture;
- cooling said mixture to room temperature;
- precipitating a product from said mixture;
- and
- dispersing said product in solvent to produce a nanocrystal dispersion.
A process of making Fe2O3 nanocrystals comprising:
- oxidizing Fe3O4 nanocrystals with an oxidizing agent, at a temperature above 30° C.
A process of making Fe-based nanocrystals comprising:
- reducing one of Fe3O4 and MFeOx nanocrystals with a reducing agent at a temperature above 30° C.
Dependencies are inferred from the claim text.