Carbon nanotube sheet and polarizer using same

Patent metadata

Field	Value
Publication number	US-9372294-B2
Application number	US-201214128245-A
Country	US
Kind code	B2
Filing date	Jun 22, 2012
Priority date	Jun 22, 2011
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

The present invention relates to a carbon nanotube sheet, and to a polarizer using same. More particularly, the present invention relates to a carbon nanotube sheet, and to a polarizer using same, the carbon nanotube sheet comprising: a substrate; and a carbon nanotube layer derived from a carbon nanotube forest and wound on the substrate, wherein the carbon nanotube layer is composed of 5 or more layers.

First claim

The invention claimed is:

1. A carbon nanotube sheet, comprising:
a substrate having at least two sides; and
at least a plurality of carbon nanotube layers, each layer being derived from a carbon nanotube forest and comprising carbon nanotubes wound on said at least two sides of the substrate by rotation of the substrate about a winding axis a number of times to establish a thickness of the carbon nanotube sheet,
wherein the carbon nanotube sheet is composed of 5 or more layers, and
wherein the layer consists of filamentary carbon nanotubes which are parallel to each other with a same separation distance and are wound orthogonal to an axis of rotation.

2. The carbon nanotube sheet of claim 1 , wherein the carbon nanotube sheet is composed of 5 to 3,000 layers.

3. The carbon nanotube sheet of claim 2 , wherein the carbon nanotube sheet is composed of 10 to 200 layers.

4. The carbon nanotube sheet of claim 1 , wherein the carbon nanotube sheet exhibits polarization performance in a terahertz frequency range.

5. The carbon nanotube sheet of claim 4 , wherein the terahertz frequency range is 0.1˜2.0 THz.

6. The carbon nanotube sheet of claim 1 , wherein the carbon nanotubes wound on the substrate are filamentary carbon nanotubes.

7. The carbon nanotube sheet of claim 1 , wherein the substrate is not formed in a region for allowing the carbon nanotube sheet to exhibit polarization performance.

8. The carbon nanotube sheet of claim 7 , wherein the substrate is a U-shaped or square or box shaped substrate.

9. The carbon nanotube sheet of claim 1 , wherein the carbon nanotube layer is wound on the substrate at a speed of 30 m/min.

10. The carbon nanotube sheet of claim 1 , wherein the carbon nanotube layer has a thickness of 4 to 10 μm.

11. The carbon nanotube sheet of claim 1 , wherein the carbon nanotubes wound on the substrate are integrated by physical or chemical means.

12. The carbon nanotube sheet of claim 1 , wherein the carbon nanotube sheet is composed of 150 or more layers, and has an extinction ratio of 40 dB.

13. A polarizer, comprising the carbon nanotube sheet of claim 1 .

14. A carbon nanotube sheet as in claim 1 wherein the substrate sides are planar.

15. A carbon nanotube sheet as in claim 1 wherein the substrate has two parallel planar sides.

16. A carbon nanotube sheet as in claim 1 wherein the substrate is U-shaped to enhance polarization performance.

17. A method of fabricating a carbon nanotube sheet, comprising the steps of:
providing a carbon nanotube forest;
deriving filamentary carbon nanotubes from the carbon nanotube forest by bringing the end of a metal pin as a deriving unit into the carbon nanotube forest to generate shear stress; and
winding the derived filamentary carbon nanotubes on a substrate by rotation of the substrate to form a carbon nanotube layer composed of 5 or more layers,
wherein filamentary carbon nanotubes are parallel each other with the same separation distance, and are wound orthogonal to a rotation axis.

18. A polarizer, comprising the carbon nanotube sheet fabricated by the method of claim 17 .

Assignees

• Kim Dia Sik
• Park Hyeong Ryeol
• Kyoung Ji Soo
• Kim Yong Hyup
• Jang Eui Yun
• Univ Seoul Nat R & Db Found

Inventors

• Kim Dia Sik
• Park Hyeong Ryeol
• Kyoung Ji Soo
• Kim Yong Hyup
• Jang Eui Yun

Classifications

• Y10T428/30

  Self-sustaining carbon mass or layer with impregnant or other layer · CPC title

• G02B2207/101

  Nanooptics · CPC title

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title