Graphite nanoplatelets for thermal and electrical applications
AssigneeThe Regents of the University of California
InventorsRobert C. Haddon, Mikhail E. Itkis, Palanisamy Ramesh, Aiping Yu, Elena Bekyarova, Kimberly Worsley
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Abstract
This disclosure concerns a procedure for bulk scale preparation of high aspect ratio, 2-dimensional nano platelets comprised of a few graphene layers, Gn. n may, for example, vary between about 2 to 10. Use of these nano platelets in applications such as thermal interface materials, advanced composites, and thin film coatings provide material systems with superior mechanical, electrical, optical, thermal, and antifriction characteristics.
Claims25
A method of fabricating graphite nano platelets, comprising:
- providing a graphite compound;
- intercalating the graphite compound by exposure to a plurality of acids;
- exfoliating the intercalated graphite compound to form graphite nano platelets, wherein the exfoliation heating rate is varied so as to vary the length to thickness ratio of the graphite nano platelets;
- and
- physically separating the graphite nano platelets.
Graphite nano platelets, comprising:
- an intercalated and thermally exfoliated graphite having an average length which varies between about 1.7 to 0.35 μm and an average thickness which varies between about 60 to 1.7 nm;
- wherein the nano platelets are substantially separated from each other.
A graphite nano platelet composite, comprising:
- a polymer;
- and
- a plurality of graphite nano platelets comprising intercalated and thermally exfoliated graphite having an average length which varies between about 1.7 to 0.35 μm and an average thickness which varies between about 60 to 1.7 nm;
- wherein the nano platelets are substantially separated from each other;
- and
- wherein the loading fraction of the graphite nano platelets ranges between approximately 0.2 to 50 vol. %, based upon the total volume of the composite.
A microelectronic package, comprising:
- a substrate;
- a thin film present on at least one surface of the substrate, the thin film comprising a plurality of graphite nano platelets, and
- an integrated circuit mounted to at least one surface of the substrate.
Dependencies are inferred from the claim text.