[Terahertz spectroscopic investigation of lanthanide-doped nano-TiO2].

Lanthanide-doped nano-TiO2 samples with different Ti/Ln (Ln = Ce, Nd, and Sm) were synthesized by sol-gel method. The samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy (XPS) and terahertz time-domain spectroscopy (THz-TDS). The results indicate that Ce, Nd, and Sm ions were uniformly dispersed into the TiO2; and the infrared activities of lanthanide-deped nano-TiO2 were much stronger than Undoped nano-TiO2, the refractive index of anatase TiO2 declines with frequency increasing in the frequency range of 0.