Аннотация
Iron-doped SnO2 nanoparticles with chemical formula Sn1-xFexO2-y (x=0.02, 0.05 and 0.10 at%) were successfully produced by a proteic
sol-gel method. Thermogravimetric analysis and differential scanning
calorimetry were performed to investigate the thermal behavior of the
precursor powders as well as to select the appropriate calcination
temperatures for oxide formation. X-ray absorption near-edge
spectroscopy studies were carried out to determine the valence state of
the transition metal used as dopant. Structural, morphological, and
optical properties of the synthesized materials were studied by X-ray
diffraction, Mossbauer spectroscopy, transmission electron microscopy,
Fourier-transform infrared spectroscopy, and ultraviolet-visible
spectroscopy. The results confirmed the formation of nanometric
spherical particles of single-phased SnO(2 )with rutile-type tetragonal
structure. Iron doping was accomplished in the form of Fe3+ substituting
for Sn(4+ )in the SnO2 matrix, with the creation of oxygen vacancies to
achieve charge balance. Band gaps of SnO2 were found to be unaffected by
the introduction of iron.
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