# US 7,608,293 B2 · Field emission device and method for manufacturing same

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- Number: US 7,608,293 B2
- Document ID: US7608293B2
- Status: Granted
- Kind: B2
- Application number: 11/453,460
- Filed: 2006-06-14
- Published: 2007-01-18
- Granted: 2009-10-27
- Earliest claimed: 2005-07-15
- Assignees: Tsinghua University; Hon Hai Precision Industry Co., Ltd.
- Inventors: Hua Huang; Yang Wei; Yang Wu; Liang Liu; Chang-Hong Liu; Shou-Shan Fan
- Web page: https://patentgrep.com/patent/US7608293B2

## CPC

- H01J 1/304: Field-emissive cathodes
- H01J 9/025: {of field emission cathodes}
- H01J 2329/00: Electron emission display panels, e.g. field emission display panels
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A field emission device, including: a cathode substrate; a carbon nanotube array slice attached on the cathode substrate, the carbon nanotube array slice including a plurality of carbon nanotube segments arranged approximately parallel to each other, the carbon nanotube segments each having a first end and an opposite second end, the first ends thereof terminating at a common plane, and the second ends thereof being electrically connected to the cathode plant. A method for manufacturing the field emission devices based on carbon nanotube array is also provided.

## Claims

### Claim 1

A method for manufacturing a field emission device, comprising the steps of:
providing a carbon nanotube array slice preform, the carbon nanotube array slice preform comprising a matrix and a plurality of carbon nanotube segments incorporated in the matrix;
placing the carbon nanotube array slice preform on a cathode substrate;
heating the matrix so as to change the matrix into a liquid state;
removing the liquid state matrix after the matrix becomes liquid;
wherein the carbon nanotube array slice preform is made by a method comprising the steps of:
providing a carbon nanotube array;
immersing the carbon nanotube array into the matrix;
solidifying the matrix so as to cause the carbon nanotube array to be embedded in the matrix;
transversely slicing the carbon nanotube array thereby obtaining the carbon nanotube array slice preform.

### Claim 2 (depends on 1)

The method of claim 1, wherein the matrix is removed using an organic solvent, and after the matrix is removed, the carbon nanotube segments are attached to the cathode substrate by Van Der Waals forces.

### Claim 3 (depends on 2)

The method of claim 2, wherein the organic solvent is dimethyl benzene, toluene, isopropyl ether or chloroform.

### Claim 4 (depends on 1)

The method of claim 1, wherein the matrix is heated by heating the cathode substrate.

### Claim 5 (depends on 1)

The method of claim 1, wherein the matrix is a phase-change material.

### Claim 6 (depends on 5)

The method of claim 5, wherein the phase-change material is selected from the group consisting of paraffin, polyolefin, polyester, epoxy resin and acrylate.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cathode substrate is heated in a shielding gas or vacuum environment.

### Claim 8 (depends on 7)

The method of claim 7, wherein the cathode substrate is heated to a temperature in a range of about 350° C. to about 600° C.