Touch pen

Abstract

A touch pen includes a body and a head fixed on one end of the body and electrically connected with the body. The head includes a carbon nanotube composite material. The carbon nanotube composite material includes a carbon nanotube structure and a conductive material layer coated on the carbon nanotube structure.

1 . A touch pen comprising:
 a body; and   a head fixed on one end of the body and electrically connected the body, wherein the head comprises a carbon nanotube composite material, the carbon nanotube composite material comprises a carbon nanotube structure and a conductive material layer coated on the carbon nanotube structure.   
     
     
         2 . The touch pen as claimed in  claim 1 , wherein the carbon nanotube structure comprises a plurality of carbon nanotubes joined by van der Walls attractive forces, and the conductive material layer is coated on an outer surface of the plurality of carbon nanotubes. 
     
     
         3 . The touch pen as claimed in  claim 2 , wherein a plurality of micropores is defined between adjacent carbon nanotubes of the plurality of carbon nanotubes. 
     
     
         4 . The touch pen as claimed in  claim 3 , wherein a diameter of the plurality of micropores is less than or equal to 5 micrometers. 
     
     
         5 . The touch pen as claimed in  claim 4 , wherein the diameter of the plurality of micropores is in a range from about 50 nanometers to about 500 nanometers. 
     
     
         6 . The touch pen as claimed in  claim 1 , wherein the conductive material layer comprises an electrically conductive polymer layer made of a material selected from the group consisting of polyaniline, polypyrrole, polythiophene, polyacetylene, polyparaphenylene, poly phenylene vinylene, and any combination thereof. 
     
     
         7 . The touch pen as claimed in  claim 6 , wherein a thickness of the electrically conductive polymer layer is in a range from about  30  nanometers to about  150  nanometers. 
     
     
         8 . The touch pen as claimed in  claim 6 , wherein a weight percentage of the material in the carbon nanotube composite material is in a range from about 5% to about 80%. 
     
     
         9 . The touch pen as claimed in  claim 6 , wherein the weight percentage of the material in the carbon nanotube composite material is in a range from about 5% to about 20%. 
     
     
         10 . The touch pen as claimed in  claim 1 , wherein the conductive material layer is a metal layer having a thickness in a range from about 1 nanometer to about 20 nanometers. 
     
     
         11 . A touch pen comprising:
 a body; and   a head fixed on one end of the body and electrically connected the body, wherein the head comprises a carbon nanotube composite layer and a supporter having an outer surface, the carbon nanotube composite layer is coated on the outer surface and electrically connected with the body, the carbon nanotube composite layer comprises a carbon nanotube structure and a conductive material layer coated on the carbon nanotube structure.   
     
     
         12 . The touch pen as claimed in  claim 11 , wherein the carbon nanotube structure comprises a plurality of carbon nanotubes joined by van der Walls attractive forces, the conductive material layer is coated on each of the plurality of carbon nanotubes. 
     
     
         13 . The touch pen as claimed in  claim 12 , wherein a plurality of micropores is defined between adjacent carbon nanotubes of the plurality of carbon nanotubes. 
     
     
         14 . The touch pen as claimed in  claim 13 , wherein a diameter of the plurality of micropores is less than or equal to 5 micrometers. 
     
     
         15 . The touch pen as claimed in  claim 14 , wherein the diameter of the plurality of micropores is in a range from about 50 nanometers to about 500 nanometers. 
     
     
         16 . The touch pen as claimed in  claim 11 , wherein the conductive material layer comprises an electrically conductive polymer layer made of a material selected from the group consisting of polyaniline, polypyrrole, polythiophene, polyacetylene, polyparaphenylene, poly phenylene vinylene, and any combination thereof. 
     
     
         17 . The touch pen as claimed in  claim 16 , wherein a thickness of the electrically conductive polymer layer is in a range from about 30 nanometers to about 150 nanometers. 
     
     
         18 . The touch pen as claimed in  claim 16 , wherein a weight percentage of the material in the carbon nanotube composite layer is in a range from about 5% to about 80%. 
     
     
         19 . The touch pen as claimed in  claim 11 , wherein the carbon nanotube composite layer is a ribbon-shaped layer helically wrapping around the supporter.