Multiwalled carbon nanotubes (MWCNTs) have been first coated with cobalt ferrites by a simple wet method. Transmission electron microscopy images show that ferrite nanoparticles (average diameter of 10 nm) were deposited on the sidewall of the MWCNTs. X-ray diffraction pattern exhibits representative diffraction peaks corresponding to spinel structure, and the structure of the MWCNTs is not distorted. X-ray photoelectron spectroscopy spectrum shows the proportion of the content of Fe and Co is about 2:1, which coincides with the stoichiometric proportion of CoFe2O4.
Poncharal, P. , Wang, Z.L., Ugarte, D. and Heer, W.A. (1999). Electrostatic Deflections and Electromechanical Resonances of Carbon Nanotubes , Science , 283: 1513-1516.
2.
Postma, H.W.C. , Teepen, T., Yao , Z., Grifoni, M. and Dekker, C. (2001). Carbon Nanotube Single-electron Transistors at Room Temperature, Science, 293: 76-79.
3.
Zhang, Y., Franklin, N.W., Chen, R.J. and Dai, H.J. ( 2000). Metal Coating on Suspended Carbon Nanotubes and its Implication to Metal-tube Interaction, Chem. Phys. Lett. , 331: 35-41.
4.
Li, X.L. , Liu, Y.Q., Fu , L., Cao , L.C., Wei , D.C. and Wang, Y. (2006). Efficient Synthesis of Carbon Nanotube-Nanoparticle Hybrids, Adv. Funct. Mater., 16: 2431-2437.
5.
Jin, F., Liu, Y., Day, C.M. and Little, S.A. ( 2007). Enhanced Electron Emission from Functionalized Carbon Nanotubes with a Barium Strontium Oxide Coating Produced by Magnetron Sputtering , Carbon, 45(3): 587-593.
6.
Fu, L., Liu, Z.M., Liu, Y.Q., Han, B.X., Wang, J.Q. and Hu, P. ( 2004). Coating Carbon Nanotubes with Rare Earth Oxide Multiwalled Nanotubes, Adv. Mater., 16: 350-352.
7.
Fu, L., Liu, Z.M., Liu, Y.Q., Han, B.X., Hu, P.G. and Cao, L.C. ( 2005). Beaded Cobalt Oxide Nanoparticles along Carbon Nanotubes: Towards more Highly Integrated Electronic Devices, Adv. Mater. , 17: 217-221.
8.
Han, M.G. and Deng, L.J. (2007). Doping Effect of Multiwall Carbon Nanotubes on the Microwave Electromagnetic Properties of NiCoZn Spinel Ferrites, Appl. Phys. Lett., 90(1): 011108-1-3.
9.
Che, R.C. , Zhi, C.Y., Liang, C.Y. and Zhou, X.G. (2006). Fabrication and Microwave Absorption of Carbon Nanotubes/CoFe2O4 Spinel Nanocomposite, Appl. Phys. Lett., 88(3): 033105-1-3.
10.
Cao, H.Q. , Zhu, M.F., Li , Y.G., Liu , G.H., Ni , Z. and Qin , Z.Y. (2007). A Highly Coercive Carbon Nanotube Coated with Ni0.5Zn0.5Fe2O4 Nanocrystals Synthesized by Chemical Precipitation-Hydrothermal Process, J. Solid. State. Chem. , 180: 3218-3223.
11.
Liu, Y.Q. and Gao, L. (2005). A Study of the Electrical Properties of Carbon Nanotube-NiFe2O4 Composites: Effect of the Surface Treatment of the Carbon Nanotubes, Carbon, 43: 47-52.
12.
Chen, C.M., Chen, M., Leu, F.C., Hsu, S.Y., Wang, S.C., Shi, S.C. and Chen, C.F. ( 2004). Purification of Multi-walled Carbon Nanotubes by Microwave Digestion Method, Diamond and Related Materials , 13: 1182-1186.
13.
Lee, C.J. , Lyu, S.C., Kim , H.W., Park, C.Y. and Yang, C.W. (2002). Large-scale Production of Aligned Carbon Nanotubes by the Vapor Phase Growth Method, Chem. Phys. Lett., 359: 109-114.
