Porous Filamentous Nanocarbon And Method Of Forming The Same

Abstract

There is provided a porous filamentous nanocarbon and a method for forming the same. A mesopore formed on an outer periphery of the porous filamentous nanocarbon is a tunnel-like pore which is formed along the arrangement direction of the carbon hexagonal plane from the outer periphery toward a fiber axis. The porous filamentous nanocarbon is fabricated by selectively removing the carbon hexagonal plane constituting the filamentous nanocarbon through gasification in virtue of a catalyst, after highly dispersing Fe, Ni, Co, Pt, etc., of which size is 2-30 nm, on the surface of the filamentous nanocarbon. That is, the tunnel-like mesopore is formed radially by nano-drilling process. The size of the porous filamentous nanocarbon can be controlled according to the size of the nano-drilling catalyst and non-drilling conditions.

1 . A porous filamentous nanocarbon having a mesopore, wherein the mesopore is a tunnel-like pore which is radially formed from an outer periphery of the filamentous nanocarbon toward the central axis of the filamentous nanocarbon. 
   
   
       2 . The porous filamentous nanocarbon of  claim 1 , wherein the filamentous nanocarbon is a nanocarbon with a platelet structure in which carbon hexagonal planes are vertically stacked with respect to the central axis, the mesopore being formed along the arrangement direction of the carbon hexagonal planes. 
   
   
       3 . The porous filamentous nanocarbon of  claim 1 , wherein the filamentous hexagonal plane is a nanofiber with a Herringbone structure which is formed in the V-shape as being inclined at an angle in a range of 20 to 80° with respect to the central axis, the mesopore being formed along the arrangement direction of the carbon hexagonal planes. 
   
   
       4 . The porous filamentous nanocarbon of anyone of  claims 1  to  3 , wherein the filamentous nanocarbon has the diameter in a range of 2 to 100 nm, and an aspect ratio of 4 or higher. 
   
   
       5 . The porous filamentous nanocarbon of anyone of  claims 1  to  3 , wherein the mesopore has the size in a range of 2 to 100 nm, and the porosity of at least 20% or greater. 
   
   
       6 . A method for forming a porous filamentous nanocarbon, the method comprising radially forming a tunnel-like mesopore from an outer periphery toward the central axis of a filamentous nano carbon by attaching a material having a metal catalyst on an outer periphery of the filamentous nanocarbon and removing a carbon hexagonal plane through gasification in virtue of the metal catalyst. 
   
   
       7 . The method of  claim 6 , wherein the metal catalyst includes at least one selected from the groups V, VI, VII, and    
     of the periodic table. 
   
   
       8 . The method of  claim 7 , wherein the metal catalyst is at least one selected from the group consisting of iron (Fe), nickel (Ni), copper (Cu), platinum (Pt), manganese (Mn), vanadium (V), and an alloy thereof. 
   
   
       9 . The method of  claim 6 , wherein the mesopore is formed according as a predetermined portion of the filamentous nanocarbon on which the metal catalyst is attached is removed through a selective gasification reaction in virtue of the metal catalyst. 
   
   
       10 . The method of  claim 9 , wherein the mesopore is formed along the arrangement direction of the carbon hexagonal plane as the predetermined portion of the carbon hexagonal plane on which the metal catalyst is attached is removed through the selective gasification reaction. 
   
   
       11 . The method of  claim 6 , wherein a reactant for gasifying the carbon hexagonal plane in virtue of the metal catalyst includes hydrogen gas. 
   
   
       12 . The method of  claim 11 , wherein the gasification temperature is in a range of 500° C. to 900° C. 
   
   
       13 . The method of  claim 6 , wherein a reactant for gasifying the carbon hexagonal plane in virtue of the metal catalyst includes oxygen gas. 
   
   
       14 . The method of  claim 13 , wherein an activation temperature is in a range of 200° C. to 400° C.