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Nanomaterials 2019, 9(2), 198; https://doi.org/10.3390/nano9020198

Determining the Composite Structure of Au-Fe-Based Submicrometre Spherical Particles Fabricated by Pulsed-Laser Melting in Liquid

1
Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
2
Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
3
Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland
*
Author to whom correspondence should be addressed.
Received: 4 January 2019 / Revised: 23 January 2019 / Accepted: 31 January 2019 / Published: 3 February 2019
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Abstract

Submicrometre spherical particles made of Au and Fe can be fabricated by pulsed-laser melting in liquid (PLML) using a mixture of Au and iron oxide nanoparticles as the raw particles dispersed in ethanol, although the detailed formation mechanism has not yet been clarified. Using a 355 nm pulsed laser to avoid extreme temperature difference between two different raw particles during laser irradiation and an Fe2O3 raw nanoparticle colloidal solution as an iron source to promote the aggregation of Au and Fe2O3 nanoparticles, we performed intensive characterization of the products and clarified the formation mechanism of Au-Fe composite submicrometre spherical particles. Because of the above two measures (Fe2O3 raw nanoparticle and 355 nm pulsed laser), the products—whether the particles are phase-separated or homogeneous alloys—basically follow the phase diagram. In Fe-rich range, the phase-separated Au-core/Fe-shell particles were formed, because quenching induces an earlier solidification of the Fe-rich component as a result of cooling from the surrounding ethanol. If the particle size is small, the quenching rate becomes very rapid and particles were less phase-separated. For high Au contents exceeding 70% in weight, crystalline Au-rich alloys were formed without phase separation. Thus, this aggregation control is required to selectively form homogeneous or phase-separated larger submicrometre-sized particles by PLML. View Full-Text
Keywords: laser melting in liquid; Au-Fe alloy; submicrometre spherical particles; phase separation; reaction control; core-shell particles; laser wavelength; zeta potential laser melting in liquid; Au-Fe alloy; submicrometre spherical particles; phase separation; reaction control; core-shell particles; laser wavelength; zeta potential
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Fuse, H.; Koshizaki, N.; Ishikawa, Y.; Swiatkowska-Warkocka, Z. Determining the Composite Structure of Au-Fe-Based Submicrometre Spherical Particles Fabricated by Pulsed-Laser Melting in Liquid. Nanomaterials 2019, 9, 198.

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