Regular Papers
Synthesis of titanium dioxide nanoparticles by solvothermal method with polymer gel
2014 年 39 巻 4 号 p. 451-454
詳細
2014 年 39 巻 4 号 p. 451-454
Highly dispersed and homogeneous titanium dioxide (TiO2) nanoparticles were synthesized by a solvothermal method with polymer gel. Polymer gel is essential for the highly dispersed and homogeneous nanoparticles. First, polyvinyl alcohol (PVA) was dissolved in water at 70°C and cooled to room temperature. Ammonium citratoperoxotitanate(IV) [(NH4)8[Ti4(C6H4O7)4(O2)4]・8H2O] was subsequently added and dissolved in the PVA solution. Next, water was evaporated from the PVA gel using a microwave. This polymer gel and ethanol as a reaction medium were placed into the Teflon reactor of a stainless-steel autoclave with an internal volume of 100 ml. Thereafter, the autoclave was sealed and kept at 230°C for 18 h. After solvothermal synthesis, the polymer gel was collected and dissolved in water at 50°C-70°C. X-ray diffraction (XRD) measurement, scanning electron microscope (SEM), and transmission electron microscope (TEM) observations were performed for the remaining unresolved polymer gel. XRD confirmed the presence of anatase TiO2. The crystallite particle size was estimated as 6.4 nm (D101) from the XRD 101 peak using the Scherrer’s equation. Highly dispersed and homogeneous TiO2 nanoparticles were obtained from TEM observation with a particle distribution of 5.6 ± 1.2 nm.
