Synthesis and characterization of single-crystal PbTiO3 nanorods

Single-crystal PbTiO3 (PT) nanorods have been synthesized by annealing PT nanocrystals in NaCl flux. The as-prepared PT nanorods are straight, with diameters of 50–80 nm and lengths of a few micrometers. The nanorods are in tetragonal crystal structure with lattice constants a = b = 3.926 Å and c = 3.963 Å. All the Raman modes of the PT nanorods have been indexed and the soften behavior of mode E(1TO) was observed, implying the weakening of ferroelectricity. The formation of the nanorods has also been discussed.