One-step synthesis of <001>-oriented PbTiO_3 nanoplates for templated grain growth by a hydrothermal method

摘要

<001>-oriented PbTiO_3 nanoplates with an average aspect ratio of approximately 5 were synthesized by a one-step hydrothermal method. The factors that could affect the growth of the PbTiO_3 nanoplates, such as the concentration of the mineralizer (KOH) and ratio of Pb~(2+)/Ti~(4+) in the source materials, were carefully investigated. A modified growth process of the PbTiO_3 nanoplates was proposed by a time variation evaluation. Therefore, the typical growth parameters were set to 200 °C/10 h, Pb~(2+)/Ti~(4+) = 1.25 (M_(p25) = 5 mmol and M_(Pb(NO3)2) = 6.25 mmol), and M_(KOH) = 8 mol/L (in 30 ml of DI water) with P25-TiO_2 and Pb(NO_3)_2 as the source materials. Furthermore, the d_(33) versus applied voltage curve showed good ferroelectric behavior with a maximum d_(33) value of ～165 pm/V, indicating promising potential as seeds for templated grain growth (TGG) of PbTiO_3 nanoplates.