Abstract
Synthesis of nano CuZnO2compound is carried out by thermal decomposition method. The crystalline phase of the material is characterized by XRD. The calculated unit cell constants area=3.1 Åandc=3.4786 Åand are of tetragonal structure. The unit cell constants are different from wurtzite (hexagonal) which indicate that a nanocompound is formed. Further TEM images reveal that the metal ion is in tetragonal structure with oxygen ligands. The prepared CuZnO2is then characterized for crystallite size analysis by employing transmission electron microscopy (TEM). The size is found to be 100 nm. Uniform bright rings are noticed in the TEM picture suggesting that the nanocrystals have preferential instead of random orientations. The selected-area electron diffraction (SAED) pattern clearly indicates the formation of CuO-ZnO nanocompound. The nature of bonding is studied by electron paramagnetic resonance (EPR). The covalency character is about 0.74 and thus the compound is electrically less conductive. Optical absorption spectral studies suggest that Cu(II) is placed in tetragonal elongation crystal field. The spin-orbit coupling constant,λ, is calculated using the EPR and optical absorption spectral results suggest some covalent bond between metal and ligand. Near infrared (NIR) spectra are due to hydroxyl and water fundamentals.
Highlights
Semiconducting compounds have drawn much attention during the last few years because of their unique properties and immense potential applications
electron paramagnetic resonance (EPR) spectra of the powdered sample are recorded at room (RT) on JEOL JES-TE100 ESR spectrometer operating at X-band frequencies
The Lorentz-Gauss ratio is maintained at values greater than 0.7 and fitting is undertaken until reproducible results are obtained with squared correlations of r2 greater than 0.995
Summary
Semiconducting compounds have drawn much attention during the last few years because of their unique properties and immense potential applications. ZnO has a stable wurtzite structure (hexagonal) with lattice constants a = 3.25 Aand c = 5.25 Aand is composed of a number of alternating planes of tetrahedrally coordinated O2− and Zn2+ ions stacked alternately along the C-axis [1]. When transition metal elements are doped, the compound exhibits ferromagnetism at room temperature. This type of doping is helpful in adjusting the energy level states of ZnO and its properties change [2]. Due to structural stability and other parameters transition metal doped zinc-oxides are used in gas sensors. A EPR study of these ions will provide information about the type of distortion and nature of bonding between metal and ligand. XRD, TEM, optical absorption, and NIR and EPR techniques are used to know the crystalline phase and site symmetry of Cu2+ in the material
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