Preparation of carbon encapsulated iron nanoparticles with very thin shells by DC arc discharge

Abstract

Abstract：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 (M s ) and coercivity (H c ) of the product B are 107.4 emu/g and 143 Oe, respectively. The formation of the CEINPs in the product B is discussed briefly.

Preparation of silicon nanomaterials by arc discharge

“…The other one is to strongly promote the role of this method in the preparation of SiNMs, as our group recently used this method to successfully prepare the novel Si/N-doped graphene composite nanosheets [48], N-doped graphene [49,50], carbon encapsulated iron nanoparticles with different shell structures [51][52][53][54] and N-doped long bamboo-like carbon nanotubes [55], by using the anode with high content of SiO 2 , increasing the temperature of nitrogen flowing into the arc discharge chamber, improving the homogeneity of anode or creating some special conditions, respectively. In fact, arc discharge method has been playing an important role in the preparations of carbon nanomaterials and nanostructures, especially fullerene (Nobel Prize in Chemistry in 1996, there are ca.…”