It is of paramount importance to create applications for SWCNTs in automation and control systems. Ferrocene-filled single-walled carbon nanotubes (SWCNTs) are interesting systems with unique properties. SWCNTs were first filled with ferrocene in 2005 [1]. Since then, many more studies have dealt with the filling ofSWCNTs with ferrocenes. The structures of ferrocenes in SWCNTs with different diameters have been investigated [2]. The growth dynamics of inner carbon nanotubes inside ferrocene-filled SWCNTs attract the interest of researchers [3]. Controlling the physics of ferrocene-filled SWCNT systems opens up superior possibilities. The outer diameter of SWCNTs is well defined. This controls the size of catalyst particles inside SWCNTs. This shows great promise for new applications in automation and control systems. In this paper, the preparation of ferrocene-filled SWCNTs allowed us to control the physics of the interior of carbon nanotubes. The growth dynamics and electronic properties of carbon nanotubes were investigated with spectroscopy. The growth rates of three carbon nanotubes were compared. The Fermi level differences in pristine SWCNTs and samples of vacuum-annealed, ferrocene-filled SWCNTs were shown.

[1] Guan L. H., Shi Z. J., Li M. X., Gu Z. N. Carbon 2005, 43(13), 2780-2785.

[2] Plank W., Pfeiffer R., Schaman C., Kuzmany H., Calvaresi M., Zerbetto F., Meyer J. ACS Nano. 2010, 4(8), 4515-4522.

[3] Shiozawa H., Pichler T., Gruneis A., Pfeiffer R., Kuzmany H., Liu Z., Suenaga K., Kataura H. Adv. Mater. 2008, 20 (8), 1443-1449.