Doped and undoped nanostructured titanium
dioxides were prepared via Sol-Gel method under varying conditions to
investigate the effects of neodymium ion doping on the titania optical
properties in MID IR range. X-ray diffraction analyses show that the amorphous
structure of the prepared samples turns to anatas polycrystalline structure
after annealing process at 500°C.
FTIR spectrums for pure and doped samples after annealing show a single
transmission peak at wave number around 1200 cm-1. The transmission
rate of the peak depends on Nd3+ concentrations and its value rises
from 1.82% (for pure TiO2) to 86.9% (for doped with 12%wt Nd3+).
Shifting on the peak occurs with a maximal shift at 7%wt Nd3+ and
then becomes stable at higher concentration. FTIR spectra give a good
indication in the direction of preparation of optical band-pass filter at a
wavelength around 8.34 μm (~1200 cm-1).
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