title: Effect of sulfur on enhancing nitrogen-doping and magnetic properties of carbon nanotubes.
abstract: Sulfur (S) is introduced as an additive in the growth atmosphere of carbon nanotubes (CNTs) in the range of 940-1020°C. CNT products with distorted sidewalls can be obtained by S-assisted growth. Moreover, many fascinating CNT structures can also be found in samples grown with S addition, such as bamboo-like CNTs, twisted CNTs, arborization-like CNTs, and bead-like CNTs. Compared with CNTs grown without S, more nitrogen-doping content is achieved in CNTs with S addition, which is beneficial for the properties and applications of nitrogen-doped CNTs. In addition, S can also enhance the encapsulation of ferromagnetic materials and thus improve the soft magnetic properties of CNTs, which is favorable to the applications of CNTs in the electromagnetic wave-absorbing and magnetic data storage areas.
authors.affiliation: Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China. fykang@tsinghua.edu.cn.
authors.forename: Tongxiang
authors.initials: T
authors.lastname: Cui
authors.forename: Ruitao
authors.initials: R
authors.lastname: Lv
authors.forename: Zheng-Hong
authors.initials: ZH
authors.lastname: Huang
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Kunlin
authors.initials: K
authors.lastname: Wang
authors.forename: Dehai
authors.initials: D
authors.lastname: Wu