Carbon?encapsulated Magnetic Nanoparticles Spontaneously Formed by Thermolysis Route

Abstract

A new method for producing carbon‐encapsulated magnetic nanoparticles using a thermolysis route is developed. The method is based on dechlorination of C₆Cl₆ with NaN₃ in the presence of Fe or Fe₁₄Nd₂B magnetic alloy. The as‐obtained products contained carbon‐encapsulated magnetic nanoparticles with the diameters between 20 and 60 nm. The products were purified and their composition and morphology were studied by means of SEM, TEM, XRD and TG‐DTA. The carbon‐encapsulated nanoparticles are superparamagnetic with the maximum saturation magnetization of 20 emu/g. This autothermal process has inherent advantages, including the use of low cost materials and the simplicity of the production protocol.