Gas-phase production of monodisperse ferroelectric nanoparticles (<10 nm in diameter)
K. S. Seol, S. Tomita, K. Takeuchi, T. Miyagawa, T. Katagiri, and Y. Ohki
Keywords: monodisperse, nanoparticles, ferroelectric, complex metal oxides
Laser ablative technology was used to prepare monodisperse nanoparticles (4-20 nm in diameter) of lead zirconate titanate (PZT). Laser ablation of a PZT ceramic target in oxygen ambience produced amorphous and irregularly-shaped PZT nanoparticles. A subsequent on-line thermal treatment performed on the PZT nanoparticles dispersed in the gas phase brought about compaction and crystallization of the nanoparticles without additional particle growth. It was found that the amorphous nanoparticles began to crystallize above 600 oC, and they became a perovskite structure at 900 oC. The crystallized nanoparticles were then size-classified by a differential mobility analyzer to yield monodisperse, highly pure, and single-crystalline PZT nanoparticles.
NSTI Nanotech 2003 Conference Technical Program Abstract