Carbon nanotube composite and preparation method of the same

Abstract

A carbon nanotube (CNT) composite of which one or more specific functional groups are bonded to surface of a CNT, and a method of preparing a CNT composite are provided. The method includes the steps of introducing an acylhalide group to surface of a CNT, and causing a reaction of the acylhalide group with a polysiloxane having amine groups so as to prepare a CNT composite of which the polysiloxane is bonded to the surface by the medium of an amide group. The CNT composite can fix metal particles uniformly and densely thereon, can have improved mechanical and electrical properties, and can be applied to various industrial fields.

1 . A carbon nanotube (CNT) composite,
 of which one or more functional groups represented by the following Chemical Formula 1 are bonded to the surface of a CNT:   
       
         
           
           
               
               
           
         
         wherein, in Chemical formula 1, 
         n is an integer of 1 to 10, 
         R 1  and R 6  are independently hydrogen or a C 1 -C 3  alkyl, and 
         R 2 , R 3 , R 4 , and R 5  are independently a C 1 -C 3  alkyl or phenyl. 
       
     
     
         2 . The CNT composite according to  claim 1 , further comprising a metal nanoparticle. 
     
     
         3 . The CNT composite according to  claim 2 , wherein the metal nanoparticle comprises at least one metal nanoparticle selected from the group consisting of palladium (Pd), rhodium (Rh), iridium (Ir), platinum (Pt), gold (Au), and silver (Ag). 
     
     
         4 . The CNT composite according to  claim 2 , wherein the metal nanoparticle is bonded to the composite by the medium of the functional group of Chemical Formula 1. 
     
     
         5 . A method of preparing a CNT composite, comprising the steps of:
 introducing an acylhalide group to surface of a CNT; and   causing a reaction of the acylhalide group with a polysiloxane having amine groups so as to prepare the CNT composite of which the polysiloxane is bonded to the surface of the CNT by the medium of an amide group.   
     
     
         6 . The method according to  claim 5 , wherein the step of introducing the acylhalide group comprises the steps of:
 treating the CNT with an acid; and   causing a reaction of the acid-treated CNT with a halogenating agent.   
     
     
         7 . The method according to  claim 6 , wherein the halogenating agent comprises thionyl chloride or phosphorus chloride. 
     
     
         8 . The method according to  claim 5 , wherein the polysiloxane having amine groups comprises a compound of the following Chemical Formula 2: 
       
         
           
           
               
               
           
         
         wherein, in Chemical formula 2, 
         n is an integer of 1 to 10, 
         R 1  and R 6  are independently hydrogen or a C 1 -C 3  alkyl, and 
         R 2 , R 3 , R 4 , and R 5  are independently a C 1 -C 3  alkyl or phenyl. 
       
     
     
         9 . The method according to  claim 8 , wherein R 3  and R 4  in Chemical Formula 2 are independently a methyl or a phenyl. 
     
     
         10 . The method according to  claim 5 , further comprising a step of dispersing the CNT composite with ultrasonic waves in the presence of an organic solvent. 
     
     
         11 . The method according to  claim 5 , further comprising a step of curing the CNT composite. 
     
     
         12 . The method according to  claim 11 , wherein the curing step is carried out at a temperature of 260 to 300° C. 
     
     
         13 . The method according to  claim 5 , further comprising a step of fixing a metal nanoparticle to the CNT composite. 
     
     
         14 . The method according to  claim 13 , wherein the step of fixing the metal nanoparticle to the CNT composite comprises the step of causing a reaction of the CNT composite in a precursor solution of the metal nanoparticles. 
     
     
         15 . The method according to  claim 14 , wherein the precursor solution of the metal nanoparticles has a concentration of 0.1 to 0.5M. 
     
     
         16 . The method according to  claim 13 , wherein the step of fixing the metal nanoparticles to the CNT composite is carried out at a temperature of 130 to 150° C. for 30 to 90 minutes.