Pulsed laser melting in liquids is a versatile and promising method for synthesis of colloidal composite submicrometer particles [1-3]. Since the fusion of the unique physical and chemical properties, such as catalytic activity, high electrical and thermal conductivity, high corrosion resistance, good ductility, malleability, and tensile strength of copper (Cu) and magnetic properties of iron (Fe) in one single entity promises multifunctionality and potential applications, a lot of effort is put into preparing particles containing Cu and Fe [4]. Composite particles based on Cu and Fe are successfully produced and tailoring by using pulsed laser melting method with various experimental parameters; wavelengths, laser fluence, irradiation time, raw material or solvent.

Here, we focus our attention at the better understanding of the composite particles formation and infer how laser parameters, raw materials, solvent affect the composition of obtained particles. For this, a series of both experimental and theoretical studies were performed. The structure, phase composition, size, morphology and magnetic properties were confirmed by XRD, SEM, TEM, EDS, XPS and SQUID. Figure 1 illustrated XRD and SEM results of examples of two different composite particles obtained by laser melting of mixture of metal oxides nanoparticles in various solvent, ethyl acetate and ethanol.

The detailed discussion will be reported at the conference. We believe, that exploring the formation mechanism, roles of raw material, solvent, laser parameters, in the composite particle formation will help in creation of materials with specific size, structures, composition and properties.

This work was supported by the Polish National Science Centre Program No. 2018/31/B/ST8/03043.

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