Metal (silicon) oxide/carbon composite particles
AssigneeNanoGram Corporation
InventorsXiangxin Bi, Sujeet Kumar, Nobuyuki Kambe
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Abstract
A collection of nanoscale particles are a composite of carbon and metal oxide or silicon oxide. The composite particles have an average diameter from about 5 nm to about 1000 nm, and can be produced by laser pyrolysis. The laser pyrolysis involves the formation of a molecular stream including a metal precursor, an infrared absorber, an oxidizing agent and a carbon precursor. The pyrolysis is driven by heat absorbed from a laser beam. Furthermore, nanoparticles including titanium oxide with a rutile crystal structure have been produced.
Claims20
A collection of particles comprising:
- a) anoxide selected from the group consisting of metal oxide or silicon oxide, and;
- b) at least about 5 percent by weight carbon, the collection of particles having an average diameter from about 5 nm to about 250 nm.
A method of producing particles comprising an oxide selected from the group consisting of metal oxide and silicon oxide, and a carbon deposit, the method comprising pyrolyzing a molecular stream in a reaction chamber, the molecular stream comprising a metal precursor or silicon precursor, an oxidizing agent, an infrared absorber and a carbon source, where the pyrolysis is driven by heat absorbed from a laser beam under conditions suitable to generate a carbon deposit and the oxidizing agent is selected from the group consisting of O2, O3, CO, CO2 and mixtures thereof.
A collection of particles comprising:
- a) an oxide selected from the group consisting of metal oxide and silicon oxide, and;
- b) at least about 1 percent by weight carbon, the collection of particles having an average diameter from about 5 nm to about 100 nm.
Dependencies are inferred from the claim text.