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Raman spectroscopic study of ZnO/NiO nanocomposites based on spatial correlation model
Sarang Dev G1, Vikas Sharma1, Ashish Singh2
1Department of Physics, School of Physical Sciences (SoPS), Doon University Dehradun - 248001 Uttarakhand India vsharma.ph@doonuniversity.ac.in neetidtripathi@gmail.com.
RSC Advances
|May 9, 2022
Summary
This study explores nickel concentration effects in ZnO/NiO nanocomposites. Raman spectroscopy confirmed distinct NiO phases and ZnO structures, with analysis revealing insights into material formation.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Zinc oxide (ZnO) and nickel oxide (NiO) are important semiconductor materials with diverse applications.
- Nanocomposites offer enhanced properties due to their unique structures.
- Controlling the incorporation of NiO within ZnO is crucial for tuning material characteristics.
Purpose of the Study:
- To investigate the influence of varying nickel (Ni) concentrations on the structural and vibrational properties of ZnO/NiO nanocomposites.
- To characterize the phase formation and structural evolution of ZnO/NiO synthesized via co-precipitation.
- To analyze the impact of Ni concentration on the Raman spectra of ZnO and understand the formation mechanisms.
Main Methods:
- Co-precipitation method for synthesizing ZnO/NiO nanocomposites with controlled Ni concentrations.
- X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) for structural and phase analysis.
- Raman spectroscopy to study vibrational modes and analyze the effects of Ni concentration on ZnO's Ehigh2 mode using the spatial correlation model.
Main Results:
- XRD and TEM confirmed the presence of distinct NiO phases within the ZnO matrix.
- Raman spectra showed characteristic modes for hexagonal wurtzite ZnO (E(low)2, E(high)2) and NiO (two-phonon mode at 1080 cm⁻¹).
- Analysis of the ZnO Ehigh2 Raman mode using the spatial correlation model provided correlation lengths, broadening, and asymmetry ratios that agreed well with experimental data, indicating the influence of Ni concentration on ZnO formation.
Conclusions:
- The co-precipitation method effectively synthesizes ZnO/NiO nanocomposites with controllable Ni incorporation.
- Raman spectroscopy is a powerful tool for probing the structural integrity of ZnO and the influence of NiO doping.
- The spatial correlation model successfully quantifies the effects of Ni concentration on ZnO's structural properties within the nanocomposite.
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