Platelet-type slit-incorporated vapor grown carbon fiber and production method thereof

Abstract

A method for producing a platelet type slit-incorporated vapor grown carbon fiber by bringing raw materials into contact with a catalyst in a heating zone, wherein the raw materials contain at least ethylene as a carbon source, and a platelet type slit-incorporated vapor grown carbon fiber obtained by the method are disclosed.

1 . A method for producing a platelet type slit-incorporated vapor grown carbon fiber by bringing raw materials into contact with a catalyst in a heating zone, wherein the raw materials contain at least ethylene as a carbon source. 
     
     
         2 . The method according to  claim 1 , wherein the catalyst is a supported type catalyst comprising a carrier and a catalyst component supported on the carrier. 
     
     
         3 . The method according to  claim 2 , wherein the catalyst component contains at least metallic nickel and/or a nickel compound. 
     
     
         4 . The method according to  claim 3 , wherein the nickel compound is selected from the group consisting of nickel nitrate, nickel chloride, nickel bromide, nickel iodide, nickel fluoride, nickel carbonate, nickel acetate and a combination thereof. 
     
     
         5 . The method according to  claim 2 , wherein the carrier contains at least a carbon material. 
     
     
         6 . The method according to  claim 5 , wherein the carbon material is carbon black. 
     
     
         7 . The method according to  claim 1 , wherein the amount (% by mass) of the catalyst component supported by the supported type catalyst is represented by the following equation:
   Supporting amount(% by mass)=[(mass of metal in catalyst component)/(mass of metal in catalyst component+mass of carrier)]×100; and   is from 1 to 65% by mass.   
     
     
         8 . The method according to  claim 1 , wherein the raw materials further comprise water. 
     
     
         9 . The method according to  claim 1 , wherein the temperature of the heating zone is from 500° C. to 800° C. 
     
     
         10 . The method according to  claim 1 , wherein a platelet type slit-incorporated vapor grown carbon fiber having a fiber diameter of 50 to 1,000 nm is produced. 
     
     
         11 . The method according to  claim 1 , wherein a platelet type slit-incorporated vapor grown carbon fiber having the fiber diameter of from 50 to 1,000 nm is produced, and
 wherein the catalyst is a supported type catalyst comprising a carrier and a catalyst component supported on the carrier,   the carrier is carbon black, and   the temperature of the heating zone is from 550° C. to 650° C.   
     
     
         12 . A platelet type slit-incorporated vapor grown carbon fiber produced by the method according to  claim 1 . 
     
     
         13 . The platelet type slit-incorporated vapor grown carbon fiber produced by the method according to  claim 12 , which has a BET surface specific area of 100 m 2 /g or more. 
     
     
         14 . The platelet type slit-incorporated vapor grown carbon fiber produced by the method according to  claim 12 , which has a fiber diameter of 50 to 1,000 nm. 
     
     
         15 . The platelet type slit-incorporated vapor grown carbon fiber produced by the method according to  claim 12 , wherein an area of holes having a ratio of a major axis length to a fiber diameter of 80% or more accounts for 5 to 50% of an area of the carbon fiber when photographic observation is performed using a transmission electron microscope (TEM). 
     
     
         16 . The platelet type slit-incorporated vapor grown carbon fiber produced by the method according to  claim 12 , wherein a graphitized layer laminated in the direction which is perpendicular to a fiber direction is provided between slits.