Preparation and characterization of BaTiO3/HA nanocomposite materials by hydrothermal synthesis

It was proposed that the piezoelectric effect played an important physiological role in bone growth, remodeling and fracture healing. Barium titanate/hydroxyapatite (BT/HA) nanorods piezoelectric composite was fabricated by hydrothermal process using 30 nm HA dissolved in different solvents (H2O, DMF, ethanol and ethylene glycol), and then reacted in the BaCl2, C6H8O7, butyl titanate mixture solution, respectively. The samples were characterized by XRD, IR, SEM and TEM to obtain sizes and crystal structure. The results showed that the BT/HA rod-like particles can be obtained at ethanol solvent, and the average diameter is about 30 nm and length is 150 nm. Meanwhile, BT/HA nanorod composites obtained at different solvents exhibited both good dielectric constant ε (18.45, 21.79, 27.40, 19.87), and piezoelectric coefficient d33 (2.74, 3.23, 6.88, 4.20), which were all higher than the piezoelectric coefficient of natural bone. The ε and d33 were improved by increasing the BT in ethanol solvent.