Room temperature synthesis and spectral characterization of Cu²⁺-doped CdO powder

Abstract

In the present study, we have synthesized undoped and Cu²⁺-doped CdO nanopowders by a mild solution method at room temperature. Powder X-ray diffraction, optical absorption, electron paramagnetic resonance and Fourier transform infrared measurements are used to characterize prepared powders. The powder X-ray diffraction patterns reflect the cubic crystal structure for undoped and Cu²⁺-doped CdO powders. Surface morphology images and compositional features are studied by scanning electron microscopy and energy-dispersive X-ray techniques, respectively. The optical absorption spectra exhibit a single absorption band for Cu²⁺-doped sample, which is the characteristic absorption band of distorted octahedral site symmetry. By correlating the electron paramagnetic resonance and optical results for Cu²⁺-doped CdO nanopowder, bonding parameters are evaluated. These values indicate the partial covalency of in-plane σ (α ²) and in-plane π bonding ($\beta_{1}^{2}$) between copper ions and their ligands. The FT-IR spectra indicate the fundamental vibrations of Cd–O.