Author/Authors :
Nasralla، N. نويسنده Ph.D. student at Newcastle University , , Yeganeh، M. نويسنده , , Astuti، Y. نويسنده pursuing her Ph.D. degree at Newcastle University, UK. , , Piticharoenphun، S. نويسنده studying for his Ph.D. degree in Chemical Engineering at Newcastle University, , , Shahtahmasebi، N. نويسنده , , Kompany، A. نويسنده Full Professor , , Karimipour، M. نويسنده , , Mendis، B.G. نويسنده postdoctoral fellow at Johns Hopkins University , , Poolton، N.R.J. نويسنده worked in a number of European institutes, , , S?iller، L. نويسنده Postdoctoral ,
Abstract :
5% (molar ratio) Fe doped TiO2 nanoparticles were prepared by a sol gel method and the post
annealing of the samples was carried out at 400 ,C, 600 ,C and 800 ,C in air. Structural characterization of
the samples was carried out using High Resolution Transmission Electron Microscopy (HRTEM). HRTEM
images of the samples revealed that the mean size of the nanoparticles changed from 8 nm to 100 nm
as the annealing temperature was increased. Experimental investigation of the electronic structure of
TiO2:Fe nanoparticles is important in order to understand the correlation between electronic and optical
properties in these samples. X-ray Photoemission Spectroscopy (XPS) of the TiO2:Fe nanoparticles was
performed to study the electronic structure. The results of XPS study confirmed the presence of Fe in all
samples, which could not be detected by HRTEM and XRD, in spite of low doping levels, and revealed that
Fe ions are predominantly in Fe3C states. Photoluminescence (PL) measurements have been measured
with an excitation energy of 250 nm to study optical properties of the TiO2:Fe nanoparticles. The active
PL band at 440 nm has been observed.
