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US 7,763,362 B2Granted
Shielding based on metallic nanoparticle compositions and devices and methods thereof
AssigneePChem Associates, Inc.
InventorsGregory A Jablonski, Michael A Mastropietro, Christopher J. Wargo
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Abstract
Disclosed are cohesive metallic structures, comprising sintered metallic nanoparticles, suitable for shielding against electromagnetic interference and radio frequency interference. Also disclosed are methods for forming such structures. Devices for shielding electromagnetic radiation and methods of shielding electromagnetic radiation using such devices are also provided.
Claims50
A cohesive metallic shielding structure, comprising:
- a population of metallic nanoparticles, deposited on a substrate and sintered to form a cohesive metallic shielding structure,
- wherein the cohesive metallic shielding structure has a characteristic thickness of less than about 20 micrometers;
- and
- wherein the cohesive metallic shielding structure has a sheet resistance less than about 50 mohms/square/mil.
1 more element
A method of forming a cohesive metallic shielding structure on a substrate, comprising:
- depositing a composition comprising a population of metallic nanoparticles dispersed in an aqueous medium onto the substrate, wherein at least a portion of the population of metallic nanoparticles comprise individual metallic nanoparticles characterized as having an average cross-sectional dimension in the range of from about 1 nm to about 100 nm;
- and wherein at least one nanoparticle comprises at least one ligand bound to its surface, the ligand comprising a heteroatom head group bound to the nanoparticle surface and a tail bound to the heteroatom head group;
- and
- curing the composition at a temperature of less than about 140° C. so as to give rise to a cohesive metallic shielding structure having a sheet resistance of less than about 50 mohms/square/mil.
1 more element
A device, comprising:
- a population of metallic nanoparticles deposited on a substrate and sintered to form a cohesive metallic shielding structure, the cohesive metallic shielding structure characterized as having a thickness of less than about 20 micrometers and a sheet resistance less than about 50 mohms/square/mil.
Dependencies are inferred from the claim text.