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Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method
Author(s) -
GuzmánEmbús Diego A.,
VargasCharry Maria F.,
VargasHernández Carlos
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13460
Subject(s) - wurtzite crystal structure , crystallinity , materials science , hydrothermal circulation , band gap , raman spectroscopy , zinc , crystallography , cadmium , hydrothermal synthesis , hexagonal crystal system , chemistry , optics , chemical engineering , optoelectronics , metallurgy , physics , engineering
Here, we examine the structural, vibrational, optical, and morphological properties of ZnO particles synthesized by the hydrothermal method, incorporating cadmium at different concentrations through the molar ratio R m = Cd +2 /Zn +2 and a thermal treatment at 500°C. The X‐ray diffraction results demonstrated the high crystallinity of the ZnO compound with a wurtzite‐type hexagonal structure. The Raman scattering spectra demonstrated that the ZnO vibrational modes occur in the region between 200 and 1300 cm −1 , which is associated with different vibrational configurations characteristic of the ZnO molecule: E 2 (Low), E 2 (M), A 1 ( TO ) E 1 ( TO ), 2B 1 (High), E 2 (High), and TA + LO . The modes that were most affected by the incorporation of Cd 2+ were those assigned to 2E 2 (Low), E 2 (M), and 2B 1 (High), and this effect was associated with a greater displacement of Zn 2+ ions. The optical study showed a reduction in the band gap and a decrease in the crystalline quality due to the substitution of Cd 2+ in the ZnO lattice. Cadmium incorporation affected the morphology of the ZnO:Cd particles, changing the lengths and diameters of the ZnO rods; when the Cd concentration was increased, the ZnO rods shortened, forming coin‐type hexagonal structures.