Preparation and characterizations of tantalum pentoxide (Ta _2O_5) nanoparticles and UV-curable Ta_2O _5-acrylic nanocomposites

摘要

Tantalum pentoxide (Ta_2O_5) nanoparticles with the sizes in the range of 20-50 nm were prepared via a chemical route in which the oleic acid (OLEA) was adopted as the surfactant for the synthesis process. X-ray diffraction (XRD) revealed the as-synthesized Ta_2O_5 transforms from amorphous to hexagonal and orthorhombic structures at the temperatures of 700°C and 750°C, respectively, illustrating the suppression of recrystallization temperature of Ta_2O_5 due to the particle size reduction. UV-curable nanocomposites containing the Ta _2O_5 nanoparticles and acrylic matrix were also prepared. Thermogravimetry analysis (TGA) found an about 10-20°C improvement on the 5% weight-loss thermal decomposition temperatures (T_ds). Dielectric measurement showed that the dielectric constant of nanocomposite increases with the increase in the filler loading without severe deterioration of dielectric loss. The increment of dielectric constants was ascribed to the addition of high-dielectric inorganic fillers as well as the presence of interfacial polarization at the organic/inorganic interfaces.