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Structurally enriched aliovalent Cd2+-doped SnO2 nanocrystals and their physicochemical investigations
Ist Teil von
Journal of materials science. Materials in electronics, 2021-06, Vol.32 (12), p.16623-16633
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2021
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In the present study, pristine and Cd
2+
modified SnO
2
compositions [Sn
(1−
y
)
Cd
y
O
2
, where
y
= 0, 0.05, and 0.10] were synthesized by co-precipitation technique. Structural studies were carried out by X-ray diffraction (XRD) analysis which revealed that all the compositions exhibited tetragonal rutile-type crystal structure with P4
2/
mnm space group with high purity (absence of secondary phases). FTIR spectra confirmed the formation of pristine and Cd
2+
modified SnO
2
nanocrystals as bend at 560 cm
−1
attributed to Sn–O–Sn stretching vibrations. UV–Vis optical spectra displayed a sharp peak at ~ 304 nm and ~ 311 nm belonging to UV region (200–400 nm) and a small hump at 561 nm corresponding to the visible region for Cd
2+
-doped compositions. FESEM micrographs depicted the nano-scale formation of pristine and Cd
2+
modified SnO
2
nanocrystals calcined at 600 °C and showed that grain size increased from 45.66 ± 1.2 nm to 60.27 ± 2.7 nm with increasing Cd
2+
concentrations. HRTEM images confirmed the tetragonal crystallinity of as-synthesized nanocrystals as fringes attributed to (110) plane orientation with d-spacing ~ 0.34 nm exactly matched with XRD studies. Dielectric analysis showed that dielectric constant decreased with increasing Cd
2+
in the compositions and
I
–
V
curves illustrated linear or ohmic behavior with diminishing values of resistances for higher Cd
2+
concentrations.