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US 7,029,514 B1Granted
Core-shell magnetic nanoparticles and nanocomposite materials formed therefrom
AssigneeUniversity of Rochester
InventorsHong Yang, Xiaowei Teng
Life of this patent
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Abstract
Monodisperse core-shell types of metal, metal oxide, and alloy nanoparticles with variable core diameters and shell thicknesses, and controlled synthesis methods for producing such nanoparticles are provided. Nanocomposite materials fabricated from nanoparticles, and methods for producing such nanocomposite materials are also provided.
Claims33
A method of forming nanoparticles, comprising:
- forming a solution of a reducing agent and a solvent under an inert gas;
- heating the solution to reflux;
- adding a metal salt or organic metallic compound to the solution to form nanoparticle cores;
- adding an organometallic compound to the solution and heating to form first core-shell nanoparticles by forming one or more shell layers over the nanoparticle cores;
- and
- heating the first core-shell nanoparticles to form the nanoparticles, the nanoparticles being selected from the group consisting of pure alloy nanoparticles and second core-shell nanoparticles, the second core-shell nanoparticles having cores or shells that differ in composition from respective cores or shells of the first core-shell nanoparticles.
3 more elements
A method of forming magnetic alloy nanoparticles, comprising:
- forming a solution of a reducing agent and a solvent under an inert gas;
- heating the solution to reflux;
- adding a metal salt or organic metallic compound to the solution to form nanoparticle cores;
- adding an organometallic compound to the solution and heating to form core-shell nanoparticles by forming one or more shell layers over the nanoparticle cores;
- transferring the core-shell nanoparticles to a substrate;
- and
- thermally annealing the core-shell nanoparticles on the substrate to reduce the one or more shell layers and form exchange coupled magnetic alloy nanoparticles.
4 more elements
A method of forming a magnetic alloy nanoparticle film, comprising:
- forming a solution of a 1,2-diol reducing agent and a solvent under an inert gas;
- heating the solution to reflux;
- adding a metal salt or an organometallic compound to the solution to form nanoparticle cores;
- then adding an organometallic compound to the solution and continuing to heat to form core-shell nanoparticles by forming one or more shell layers over the nanoparticle cores;
- transferring the core-shell nanoparticles to a substrate;
- thermally annealing the core-shell nanoparticles to reduce the one or more shell layers and form an exchange coupled magnetic alloy thin film.
3 more elements
A method of forming an alloy magnet, comprising:
- forming a solution of a reducing agent and a solvent under an inert gas;
- heating the solution to reflux;
- adding a metal salt to the solution to form nanoparticle cores;
- adding an organometallic compound to the solution and heating to form core-shell nanoparticles by forming one or more shell layers over the nanoparticle cores;
- transferring the core-shell nanoparticles to a substrate;
- and
- thermally annealing the core-shell nanoparticles to reduce the one or more shell layers and form an exchange coupled alloy magnet.
4 more elements
A method of forming nanoparticles, comprising:
- forming a solution of a reducing agent and a solvent under an inert gas;
- heating the solution to reflux;
- adding a metal salt to the solution to form nanoparticle cores;
- adding an organometallic compound to the solution and heating to form first core-shell nanoparticles by forming one or more shell layers over the nanoparticle cores;
- transferring the first core-shell nanoparticles to a substrate;
- and
- thermally annealing the first core-shell nanoparticles to reduce the one or more shell layers and form the nanoparticles, the nanoparticles being selected from the group consisting of pure alloy nanoparticles and second core-shell nanoparticles, the second core-shell nanoparticles having cores or shells that differ in composition from respective cores or shells of the first core-shell nanoparticles.
4 more elements
Dependencies are inferred from the claim text.