Abstract
Iron carbide nanoparticles were synthesized by laser ablation of iron in alcohols (methanol and ethanol). A new cell, designed to allow the ablation to be conducted in a flowing solvent, enabled separation and collection of the nanoparticles immediately after production, thus preventing further photochemical reactions of the colloids. The nanoparticles were investigated using Mössbauer spectroscopy, X-ray diffraction, and transmission electron microscopy. In methanol, they consisted of α-iron, γ-iron, iron carbide, and amorphous paramagnetic iron carbides, whereas in ethanol they consisted of iron carbides and amorphous paramagnetic iron carbides. The difference in products depending on the alcohol was attributed to the different carbon supplies for methanol and ethanol. For both solvents, the average particle size was found to be 16 nm, and the nanoparticles were dispersed in amorphous carbon. We also examined the effect of further laser irradiation of the colloids using stagnant solvent, and the particle size was found to increase and a very small amount of carbonization was observed.
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This article is part of the Topical Collection on Proceedings of the 2nd Mediterranean Conference on the Applications of the Mössbauer Effect (MECAME 2016), Cavtat, Croatia, 31 May-3 June 2016
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Amagasa, S., Nishida, N., Kobayashi, Y. et al. Mössbauer study of iron carbide nanoparticles produced by laser ablation in alcohols. Hyperfine Interact 237, 110 (2016). https://doi.org/10.1007/s10751-016-1322-5
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DOI: https://doi.org/10.1007/s10751-016-1322-5