A Facile and Scalable Method to Sythesize Eu~(3+)-Doped TiO_2 Porous Nanofibers with Electrospinning

摘要

We report a facile and scalable approach to synthesize Eu3+ doped TiO2 porous nanofibers with electrospinning. TiO2 nanofibers with various Eu3+ concentration (1, 3, 5, 7, and 9 mol%) have been prepared. The structure, morphology, luminescence, and magnetic properties of the porous TiO2 nanofibers were analyzed as a function of Eu3+ ion contents. The X-ray diffraction (XRD) and Raman results reveal that all the peaks are consistent with the TiO2 anatase structure and the Eu3+ doping rarely changes the crystal structure of the TiO2 nanofibers, but its crystalinity, even if the concentration increases to 9 mol%. Photoluminescence (PL) spectra demonstrate that all the luminescence peaks correspond to the characteristic peaks of Eu3+ ion and the emission intensity increases with the Eu3+ content. The concentration quenching of Eu3+ ion has not been found in the doping range. The magnetic properties of the Eu3+ doped TiO2 nanofibers indicate that an ordered magnetic structure can exist in the Eu3+ doped TiO2 porous nanofibers at the temperature range of 5-300 K. The ferromagnetism behavior at room temperature increases firstly and then decreases with the Eu3+ doping concentration, which is attributed to the defects and bound magnetic polarons in the fibers.