Fabrication of BaTiO₃-Y:EU composite micropatterns by combination of laser induced pyrolysis method and nanocrystalline seeding technique

This paper describes a method for fabricating dielectric BaTiO₃ (BT) micropatterns seeded with BT nanocrystalline particles and Y:Eu compound nanoparticles. The method is a combination of a laser induced pyrolysis method and a nanocrystalline seeding technique. The BT particles were prepared by hydrolysis of BT complex alkoxide with polyvinylpyrolli done (PVP). The Y:Eu particles were prepared by homogeneous precipitation of Y(NO₃) ₃ and Eu(NO₃)₃ with PVP. A precursor film was fabricated spin-coating a solution containing BT complex alkoxide, the BT particles, the Y:Eu particles and PVP on Pt substrate. A micropattern with a line width of about 1-2 μm was fabricated by irradiating an Ar⁺ laser beam on the film, and then stripping laser unirradiated region with HCl aqueous solution. The micropattern containing 5 vol.-% BT particles and 5 vol.-% Y:Eu particles revealed luminescence at 614 nm derived from Eu³⁺. Its dielectric constant and dissipation factor attained 21·2 and 0·089 respectively.