| 초록 |
In the last two decades, laser ablation technique has been successfully applied for metallic nanoparticle synthesis as well as many kinds of functional oxide nanoparticles. This process is called ‘laser ablation in liquid’ which produces nanoparticles from an ionized plasma or plume produced by laser when it shines at adequate solid targets. In thin film process, one kind of laser ablation, the ionized plasma from solid target is deposited on proper substrate resulting epitaxial structure in vacuum and/or gas ambient condition, meanwhile, in laser ablation in liquid process, atoms, molecules, ions, clusters in evaporated plasma are captured or trapped in liquid medium and undergo nucleation, growth in a consequent of chemical reaction with liquid remaining nanoparticles. During this process, morphologies, shape, size and microstructure of nanoparticles which are strongly related with physical and chemical properties can be tuned easily by varying synthesis conditions and liquid medium atmosphere. By this process, SmFeO3 particles were prepared successfully recently. Spherical shaped SmFeO3 particles were obtained and showed remarkable enhancement in magnetic property which has significant meaning for sensor or chemical applications. In this presentation, synthesis of rare-earth ferrite will be discussed in detail. |
