|
|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
MAT.P-523 |
| Subject |
Purification of carbon nanotube fibers for improvement of their mechanical properties and electrical conductivity by removing the residual catalyst and amorphous carbon |
| Authors |
Youngjin Kim, youngkwan kim1,*
Carbon Composite materials Research Center, Korea Institute of Science and Technology, Korea
1Korea Institute of Science and Technology, Korea
|
| Abstract |
Carbon nanotubes (CNTs) have atrracted a great attention owing to their unique chmical, physical and mechanical properties. In particular, CNTs have theoretically and experimentally high the tensile strength (100 GPa), elastic modulus (200~1500 GPa), tensile elongation (~30%) and electrical conductivity (105~107 S/m). Based on those properties, CNTs have been extensively investigatd for various applications such as CNT-based supercapacitors, batteries, chemical sensors and nanocomposites. To utilize the excellent properties of CNTs, many efforts have been devoted to develop an efficient fabrication process of bulk-scale fibrous CNT assemblies such as forest, wet, direct spinning methods. Among those methods, the direct spinning from a synthetic chemical vapor depotision (CVD) reactor had a great potential for scale-up and continuous production. However, CNT fibers fabricated by direct spinning method contain a large quantity of impurities such as catalytic metal particles and amorphous carbon. The impurities adversely affect mechanical and electrical properties because they disturbed the interaction between CNT bundles and increase the contact resistance. Herein, we report a simple method for purification of CNT fibers synthesized by the direct spinning method. The purification process involved 3 steps such as thermal oxidation, acid washing and themral annealing. As a result, the impurities on the surface of CNT fibers were successfully removed and then their michanical and electrical properties were considerably enhanced by 15 fold and 5 fold, respectively. We also experimentally proved this significant enhancement of CNT fibers originated from the purification induced densification and alignment effects. |
| E-mail |
dudwls9300@kist.re.kr |
|
121st General Meeting of the KCS