Synthesis of carbon-encapsulated magnetic nanoparticles by pulsed laser irradiation of solution

• Published in: Carbon (New York) Vol. 46; no. 11; pp. 1369 - 1377
• Main Authors: Park, J.B., Jeong, S.H., Jeong, M.S., Kim, J.Y., Cho, B.K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.2008; Elsevier Science
• Subjects: Chemistry; Colloidal state and disperse state; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; General and physical chemistry; Materials science; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physics; Specific materials; Xylenes; Stability; Atmospheric pressure; Device; Hydrocarbons; Iron; XRD; Electron microscopy; Raman spectroscopy; Carbon; Cobalt; Pulsed lasers; Nanoparticles; Synthesis; Ambient temperature; Transition elements; Growth mechanism; Benzenic compound; Nickel; Diameter; Electron spectrometry
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2008.05.011

A method for synthesizing carbon-encapsulated magnetic nanoparticles (CEMNPs) is reported. In the proposed method, a solution containing various metalocenes dissolved in xylene is irradiated with a nanosecond pulsed ultraviolet laser at room temperature and atmospheric pressure. Upon the completion of irradiation, CEMNPs (Fe–C, Ni–C, Co–C) with diameters ranging from a few nanometers to about 300 nm are produced in the solution. The material characteristics of these nanoparticles are then examined with electron microscopy, Raman spectroscopy, X-ray diffraction (XRD) and superconducting quantum interference device (SQUID) magnetometry. It was found that the magnetic nanoparticles coated with graphitic shells exhibit good stability in a high concentration HCl (10 mol) solution. The possible growth mechanisms of CEMNPs under the pulsed laser irradiation of the solution are then discussed.