Length-controlled synthesis and the photoluminescence of pre-perovskite PbTiO3 nanofibers

摘要

A novel approach that combines a modified sol-gel process with a PVA-assisted hydrothermal reaction at 200 °C for 12 h has been developed to prepare single-crystal pre-perovskite PbTiO3 nanofibers with good dispersity and length control. By increasing the dosage of triethanolamine (TEA) solution into the Ti precursor to modify the sol-gel process, the length of the nanofibers in the prepared samples decreased from about 35-90 μm to 5-12 μm, whereas the corresponding diameter remained in the range of 100-300 nm. Further, the dispersity of the samples, as well as the diameter uniformity of a single nanofiber, was improved significantly. In particular, a broad green photoluminescence (PL) emission (~550 nm) was observed in the nanofibers at room temperature. It is interesting to find that no obvious size effect was detected on the green PL emission.