Printed structure comprising aligned carbon nanotubes for electromagnetic interference (EMI) shielding
AssigneeThe Board of Trustrees of the University of Illinois
InventorsJoseph W. Lyding, Gang Wang
Life of this patent
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Abstract
An electromagnetic interference (EMI) shielding material comprises a freestanding printed structure including aligned single-walled carbon nanotubes, wherein an alignment direction of the aligned single-walled carbon nanotubes coincides with a parallel direction of the freestanding printed structure, and wherein a property of the freestanding printed structure measured along the parallel direction is at least about 1.5 times as high as the property measured along a perpendicular direction of the freestanding printed structure.
Claims20
An electromagnetic interference (EMI) shielding material comprising:
- a freestanding printed structure including aligned single-walled carbon nanotubes,
- wherein an alignment direction of the aligned single-walled carbon nanotubes coincides with a parallel direction of the freestanding printed structure, and
- wherein a property of the freestanding printed structure measured along the parallel direction is at least about 1.5 times as high as the property measured along a perpendicular direction of the freestanding printed structure,
- wherein the aligned single-walled carbon nanotubes account for at least about 70% of a total mass of the freestanding printed structure.
The EMI shielding material of 8, wherein the SSE is as high as about 233,000 dB·cm2/g.
A method of making an EMI shielding material, the method comprising:
- continuously injecting a carbon material solution comprising single-walled carbon nanotubes through a nozzle into a coagulation liquid and moving the nozzle relative to a substrate submerged in the coagulation liquid, thereby forming an extruded filament comprising the single-walled carbon nanotubes and aligning the carbon nanotubes along an axis of the extruded filament;
- depositing the extruded filament onto the substrate as the nozzle is moved along a print path, thereby forming a printed structure comprising the single-walled carbon nanotubes aligned along the print path;
- and
- after deposition, removing the printed structure from the substrate, thereby forming a freestanding printed structure comprising aligned single-wall carbon nanotubes, wherein a property of the freestanding printed structure measured along the parallel direction is at least about 1.5 times as high as the property measured along a perpendicular direction of the freestanding printed structure, and wherein the aligned single-walled carbon nanotubes account for at least about 70% of a total mass of the freestanding printed structure.
Dependencies are inferred from the claim text.