Enhanced Raman scattering and photoluminescence of Bi3.25La0.75Ti3O12 nanotube arrays for optical and ferroelectric multifunctional applications

摘要

Raman scattering enhancement has been observed from highly ordered ferroelectric Bi_3.25La_0.75Ti₃O₁₂ nanotube (BLT-NT) arrays prepared by a template-assisted method. Scattering enhancement factor which is the ratio of average Raman intensity per molecule for nanostructure and film is evaluated to be about 92, 257, and 623 corresponding to the outer diameters of 50, 100, and 200 nm, respectively. The phenomena can be attributed to unique surface, microstructure, grain size, and tensile stress in the curved nanotube walls. These results indicate that BLT-NT arrays are suitable for fabricating multifunctional devices due to remaining good ferroelectricity.