Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7834785 | Applied Surface Science | 2018 | 15 Pages |
Abstract
Fe-containing nanoparticles are of a high mass fraction in the as-grown carbon nanotube (CNT) network. By controlling the S-to-Fe atom ratio in the growth feedstock and introducing water as a weak oxidant, highly crystalline few-walled CNT network can be obtained, with a mass fraction of over 20â¯wt% for the Fe-containing nanoparticles. We report here an electron-oxidation-based purification method to efficiently remove the Fe-containing nanoparticles without inducing clear damage to either the assembly structure or the tube crystallinity. The purification could increase the ratio between Raman D and G peak intensities slightly from 0.08 to 0.12, decrease the specific conductivity from 0.31 to 0.24â¯Sâ¯m2/g and the Fe content from >20â¯wt% to â1â¯wt%, and modify the capacitance just by about 13â¯F/g. All these indicate that the CNT network was well maintained by such gentle electro-oxidation-based purification. In addition, the purified CNT network can exhibit advantages in mechanical and electrical applications.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Xueqin Yang, Ming Yang, Huichao Zhang, Jingna Zhao, Xiaohua Zhang, Qingwen Li,