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Effect of sulfur on enhancing nitrogen-doping and magnetic properties of carbon nanotubes

Author(s): Cui Tongxiang | Lv Ruitao | Huang Zheng-hong | Kang Feiyu | Wang Kunlin | Wu Dehai

Journal: Nanoscale Research Letters ISSN 1931-7573
Volume: 6; Issue: 1; Start page: 77; Date: 2011;
Original page

ABSTRACT
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.