High temperature oxidation of iron-iron oxide core-shell nanowires composed of iron nanoparticles

Physical Chemistry Chemical Physics : PCCP
Marcin KrajewskiDariusz Wasik

Abstract

This work describes an oxidation process of iron-iron oxide core-shell nanowires at temperatures between 100 °C and 800 °C. The studied nanomaterial was synthesized through a simple chemical reduction of iron trichloride in an external magnetic field under a constant flow of argon. The electron microscopy investigations allowed determining that the as-prepared nanowires were composed of self-assembled iron nanoparticles which were covered by a 3 nm thick oxide shell and separated from each other by a thin interface layer. Both these layers exhibited an amorphous or highly-disordered character which was traced by means of transmission electron microscopy and Mössbauer spectroscopy. The thermal oxidation was carried out under a constant flow of argon which contained the traces of oxygen. The first stage of process was related to slow transformations of amorphous Fe and amorphous iron oxides into crystalline phases and disappearance of interfaces between iron nanoparticles forming the studied nanomaterial (range: 25-300 °C). After that, the crystalline iron core and iron oxide shell became oxidized and signals for different compositions of iron oxide sheath were observed (range: 300-800 °C) using X-ray diffraction, Raman spectrosc...Continue Reading

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Oct 2, 2015·Beilstein Journal of Nanotechnology·Marcin KrajewskiDariusz Wasik

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Citations

Jul 22, 2016·Journal of the American Chemical Society·Hua Bing TaoBin Liu
Jun 15, 2018·Physical Chemistry Chemical Physics : PCCP·Gurcan AralAdri C T van Duin
Sep 11, 2019·Nanoscale Research Letters·Aiman MukhtarKai-Ming Wu
Nov 20, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Frédéric LoosliJean-François Berret
May 24, 2017·Journal of Environmental Science and Health. Part C, Environmental Carcinogenesis & Ecotoxicology Reviews·Jing LiJun-Jie Yin
Apr 7, 2018·Nano Letters·Sebastian EkerothUlf Helmersson

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