[2P01-53] Poster Presentation

[2P45] Effect of addition of water on growth of iron-filled carbon nanotubes

*Takumi Hoshiya¹, Yuji Fujiwara¹, Hideki Sato¹ (1. Graduate School of Engineering, Mie University)

Iron-encapsulated carbon nanotubes (Fe@CNTs), multiwall CNTs that encapsulate iron nanowires in those inner hollows, have excellent magnetic properties that originate in the encapsulated iron nanowires and are promising for various magnetic applications. According to our previous studies, the diameter of Fe@CNTs did not depend on those growth conditions, and their outer and inner diameters were almost constant at about 60 nm and 20 nm, respectively. For the applications of Fe@CNTs, it is desirable to be able to control their inner and outer diameters arbitrarily. In this study, we examined the effect of addition of water vapor during the growth of Fe@CNTs by chemical vapor deposition (CVD) to control the diameter of Fe@CNTs. It has been reported that addition of water vapor, which is known to activate the growth catalyst of CNTs by CVD and enhances the CNT growth. Our results showed that the addition of water vapor during CVD reduced the diameters of CNTs.