Fabrication and microwave absorption of carbon nanotubes∕CoFe2O4 spinel nanocomposite

作者：R. C. Che, Chunyi Zhi, Changhao Liang, Xianming Zhou · 发表于：Applied Physics Letters · 年份：2006 · DOI：10.1063/1.2165276 · 被引用次数：555 · 研究领域：Electromagnetic wave absorption materials、Magnetic Properties and Synthesis of Ferrites、Advancements in Battery Materials

A large-scale carbon nanotube∕CoFe2O4 (CNTs∕CoFe2O4) spinel nanocomposite has been fabricated by a chemical vapor deposition method using CoFe2O4 nanoparticles as catalysts. A uniform mixture of CNTs and CoFe2O4 nanoparticles was obtained simultaneously. The structure and chemical composition of the product were investigated using various techniques, such as x-ray diffraction, high-resolution transmission electron microscopy, and electron energy loss spectroscopy. It was found that the particles functionalized on CNTs were cubic phase CoFe2O4. Microwave absorption of the CNT∕CoFe2O4 nanocomposites at 2–18 GHz is evidently enhanced, as compared with that of both pure CNTs and CoFe2O4 nanoparticles. The enhancement mechanism is discussed based on magnetization hysteresis loop measurement and electromagnetic theory.