Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing

Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior

“…1(b)), although the synthesis conditions were similar to Ref. [20], can be explained by the modified post-synthetic rinsing procedure of precursor titania nanotubes (rinse once with 1 M HCl, followed by rinsing with H 2 O until pH = 7). The release of residual H + ions from the interlayers of nanotubes could induce the lowering of the pH during the hydrothermal treatment of nanotubes and hence the appearance of nanocrystals of mixed shapes and sizes.…”

“…The process of synthesis was controlled by the hydrothermal conditions such as the temperature and duration time as well as the concentration and pH value of precursor dispersions [20,31,32]. Our previous results showed that the hydrothermal treatment of titania nanotubes at pH = 5 leads to formation of elongated, prolate spheroid-like nanocrystals independently of the concentration of starting dispersion of titania nanotubes and the concentration of dopant ions [20]. The appearance of Co 2+ doped TiO 2 nanoparticles of mixed shapes in this study ( Fig.…”

“…More precisely, the problem of so called "self-purifications", according to which the dopant ions are expelled from the nanoparticle core during the crystal growth when synthesis starts from the molecular precursors [19], should be prevailed. We developed hydrothermal synthetic procedure for incorporation of various dopant ions (transition metal ions and rare earth ions) in TiO 2 nanocrystals of various shapes (faceted nanoparticles, prolate nanospheroids) using dispersions of titania nanotubes and dopant ions, as precursors [20][21][22][23]. In our previous work, we reported ferromagnetic ordering in faceted Co 2+ doped TiO 2 nanoparticles synthesized hydrothermally in acidic conditions (pH = 3), by shape transformation of titania nanotubes in the presence of Co 2+ ions [24].…”

Smart Mn7+ Sensing via Quenching on Dual Fluorescence of Eu3+ Complex-Modified TiO2 Nanoparticles

“…The decrease of particle size of ETP-modified TiO 2 is mainly caused by ETP entering the lattice and binding with oxygen. Due to internal stress in the crystal lattice, the diffusion of Ti 4+ and O 2and the obstacle of crystal migration, the crystal growth at the boundary is retarded [38].…”

Novel 3D flower-like TiO2:Eu3+ hierarchitectures: Hydrothermal synthesis and luminescent properties

“…Z.V. Saponjic and co-workers have reported the fabrication of Eu 3+ doped TiO 2 nanocrystals and prolate nanospheroids by the hydrothermal processing [21]. The TiO 2 :Eu 3+ submicrospheres have been prepared by our group through a simple hydrothermal method [22].…”