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论文类型： 期刊论文

发表时间： 2010-11-01

发表刊物： CARBON

收录刊物： SCIE、EI、Scopus

卷号： 48

期号： 13

页面范围： 3858-3863

ISSN号： 0008-6223

摘要： Carbon-encapsulated iron-based nanoparticles with a core-shell structure were produced by detonation decomposition of explosive mixture precursors containing iron ion components. The size and magnetic properties of the as-prepared composite particles were revealed by X-ray powder diffraction, transmission electron microscopy and magnetic measurements. Results showed that the different sizes of the iron-based nanocrystal core and the thickness of the carbon shell could be yielded by adjusting the component materials of the explosive precursors during the course of these detonation chemical reactions. The composite particles had a body-centered cubic iron or iron carbide core with a coating of graphitic or amorphous carbon layers. Magnetic measurements indicated these composite nanoparticles were magnetic at the room temperature, with some variation in the values of saturation magnetization, remanences and coercive forces that depend on the size and grain composition. (C) 2010 Elsevier Ltd. All rights reserved.