title: [Terahertz spectroscopic investigation of lanthanide-doped nano-TiO2].
abstract: 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 0.2-1.70 THz at room temperature, and it exhibits anomalous dispersion. Unique characteristic absorption peaks at 1.35 and 1.58 THz were observed from Ce-doped nano-TiO2. Compared with undoped nano-TiO2, the absorption edges of Ce-doped nano-TiO2 were red-shifted remarkably and those of Nd and Sm ions doped nano-TiO2 were blue-shifted. Sm-doped nano-TiO2 has induced the least dielectric losses in the frequency range of 0.2-1.7 THz, and the average value is 0.05.
authors.affiliation: College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China. fengxiujun10329@163.com
authors.forename: Xiu-Jun
authors.initials: XJ
authors.lastname: Feng
authors.forename: Wan-Xia
authors.initials: WX
authors.lastname: Huang
authors.forename: Qi-Wu
authors.initials: QW
authors.lastname: Shi
authors.forename: Yu-Bo
authors.initials: YB
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.forename: Ya-Xin
authors.initials: YX
authors.lastname: Zhang