Abstract
Modification of the size and phase composition of magnetic oxide nanomaterials dispersed in liquids by laser synthesis and processing of colloids has high implications for applications in biomedicine, catalysis and for nanoparticle-polymer composites. Controlling these properties for ternary oxides, however, is challenging with typical additives like salts and ligands and can lead to unwanted byproducts and various phases. In our study, we demonstrate how additive-free pulsed laser post-processing (LPP) of colloidal yttrium iron oxide nanoparticles using high repetition rates and power at 355 nm laser wavelength can be used for phase transformation and phase purification of the garnet structure by variation of the laser fluence as well as the applied energy dose. Furthermore, LPP allows particle size modification between 5 nm (ps laser) and 20 nm (ns laser) and significant increase of the monodispersity. Resulting colloidal nanoparticles are investigated regarding their size, structure and temperature-dependent magnetic properties.
Highlights
Magnetic mixed metal oxide nanoparticles are an important class of materials for catalysis [1,2], biomedicine [3,4,5], and nanoparticle-polymer composites [6,7] and are of high interest for applications in additive manufacturing, e.g., for 4D printing of magnetic structures [8,9,10]
There is no effect of the laser irradiation on nanoparticle size, in the melting regime, particles partially melt and/or fuse together (LML), in the fragmentation regime the fluence is large enough to fragmentize particles (LFL) and in the optical breakdown regime (OB), losses through ionization of the liquid reduce fragmentation efficiency
We suggest that TN2 = 570 K arising after ps-LFL is due to the formation of the YIP phase from larger
Summary
Magnetic mixed metal oxide nanoparticles are an important class of materials for catalysis [1,2], biomedicine [3,4,5], and nanoparticle-polymer composites [6,7] and are of high interest for applications in additive manufacturing, e.g., for 4D printing of magnetic structures [8,9,10]. For many of these applications, nanoparticles are required in colloidal form, dispersed in liquids such as pure water, organic solvents or polymer solutions. In this way, challenging materials like ternary oxide nanoparticles [29,30] or doped nanoparticles [31,32] can be produced
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