The demand for sub-micrometer or nanometer functional ceramic powders with a better suspension behavior in aqueous media is increasing. Redispersible barium titanate (BT) nanocrystals, green light emitting Mn2+ doped Zn2SiO4 and ZnS nanoparticle phosphors were synthesized by a hydrothermal method or chemical precipitation with surface modification. The nanoparticle redispersibility for BT was achieved by using a polymeric surfactant. X-ray diffraction (XRD) results indicated that the BT particles are of cubic phase with 80 nm in size. XRD results of zinc silicate phosphor indicate that seeds play an important role in enhancing the nucleation and crystallization of Zn2SiO4 crystals in a hydrothermal condition. This paper describes and discuss the methods of surface modification, and the resulting related properties for BT, zinc silicate and zinc sulfide.

Keywords: Barium titanate, Nanoparticles, Luminescence, Mn2+ doped ZnS, Surface passivation, Seeding; Zinc silicate