Carbon encapsulated iron nanoparticles (CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature (AIT) of 800 ℃. The results of high resolution tr...Carbon encapsulated iron nanoparticles (CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature (AIT) of 800 ℃. The results of high resolution transmission electron microscope (HRTEM), energy dispersive X-ray (EDX) spectroscope, X-ray diffraction (XRD), and X-ray photoelectron spectroscope (XPS) characterizations on the product B show that the thickness of the carbon shells of CEINPs in the product B is in the range of ca. 0.5-5.3 nm, i. e., which can be as thin as only two layers of graphite. The average diameter of the CEINPs is about 24. 7 nm. The total content of Fe element in the product B is 77.0 wt%. The saturation magnetization (Ms) and coercivity (Hc) of the product B are 107.4 emu/g and 143 Oe. resnectivelv. The formation of the CEINPs in the oroduct B is discussed briefly.展开更多
文摘Carbon encapsulated iron nanoparticles (CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature (AIT) of 800 ℃. The results of high resolution transmission electron microscope (HRTEM), energy dispersive X-ray (EDX) spectroscope, X-ray diffraction (XRD), and X-ray photoelectron spectroscope (XPS) characterizations on the product B show that the thickness of the carbon shells of CEINPs in the product B is in the range of ca. 0.5-5.3 nm, i. e., which can be as thin as only two layers of graphite. The average diameter of the CEINPs is about 24. 7 nm. The total content of Fe element in the product B is 77.0 wt%. The saturation magnetization (Ms) and coercivity (Hc) of the product B are 107.4 emu/g and 143 Oe. resnectivelv. The formation of the CEINPs in the oroduct B is discussed briefly.