The structural and magnetic properties of Co-doped titanate nanotubes synthesized under hydrothermal conditions

Elongated Titanate Nanostructures and Their Applications

“…[180] In both processes, crystallisation of titanate nanotubes results in the arrangement of Co II ions at octahedral positions of Ti 4+ in the titanate lattice. [179] In this case, the room-temperature ferromagnetism is probably associated with oxygen vacancies resulting from such a substitution. [182] In contrast, according to ref.…”

“…Pure titanate nanotubes have paramagnetic properties; [179] doping nanotubes with Co 2+ results in ferromagnetic properties with a coercivity of ca. 40 Oe.…”

Temperature study of magnetic resonance spectra of co-modified (Co,N)-TiO2nanocomposites

“…Huang et al [25] studied EPR spectra at RT of Co:TiO 2 nanotubes and recorded a not so broad (peak-to-peak linewidth ∼400 G) EPR line centered at g = 2.19 and attributed it to high spin Co 2+ ions in an octahedral environment.…”

“…Brought to you by | MIT Libraries Authenticated Download Date | 5/12/18 11:48 PM They concluded that the Co atoms should occupy Ti sites in TiO 6 octahedra in the layers of titanate nanotubes, giving spectroscopic evidence for the substitution of Co 2+ for Ti 4+ [25]. From additional magnetization study they deduced that RTFM arises from the exchange interaction between Co 2+ mediated by oxygen vacancies, and not from Co nanoclusters.…”

Visible light active C-doped titanate nanotubes prepared via alkaline hydrothermal treatment of C-doped nanoparticulate TiO2: Photo-electrochemical and photocatalytic properties

“…Recently much research has focused on selective doping of both metallic and non-metallic elements (such as carbon and nitrogen) into the lattice of TiO 2 nanoparticles in an attempt to shift absorbance into the visible region of the solar spectrum and so increase the number of utilizable solar photons available for initiation of photocatalysis [18][19][20][21][22][23][24]. Doping of TNTs (with elements such as carbon, nitrogen or tungsten) might further enhance the photocatalytic efficiencies of the nanotube materials by similarly extending the absorption onset into the visible light region [25][26][27].…”