article · Journal of the Iranian Chemical Society
Nickel oxide, cobalt oxide, and their mixed nanocomposites at 10, 20, 30, and 40 percent concentrations were prepared using a hydrothermal synthesis method. Structural analysis confirmed the presence of single-phase polycrystalline materials with distinct physical morphologies and characteristic metal-oxygen bonds. Optical measurements identified specific absorption features for each oxide component and revealed optical band gaps between 2.37 eV and 2.67 eV for the composite materials. Electrical evaluations indicated that the dielectric constant decreased as frequency increased, a behaviour explained by established conduction models. Concurrently, alternating current conductivity rose at higher frequencies, an outcome linked directly to the cobalt oxide concentration and internal oxygen vacancies. These properties point towards potential utility in advanced electronic and energy storage systems.
Modern electronics and energy systems rely on advanced materials that can store charge effectively and function under high-frequency conditions. By synthesising and testing combinations of nickel and cobalt oxides, this study provides detailed measurements of how altering material ratios changes electrical and optical performance, helping to guide the design of future components for power storage and high-speed electronics.
The findings could eventually inform the design of supercapacitors, spintronic components, and ultra-high dielectric materials used by electronic device manufacturers. However, this study remains early-stage laboratory research focused on material synthesis and fundamental property measurements. The abstract provides no device prototypes, scale-up metrics, or testing in operational conditions, meaning substantial development is required before commercial deployment.
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Abstract Nanosized materials are increasingly being recognized as inherent components in the development of energy storage devices and other state-of-the-art dielectric applications. In this work, nickel oxide (NiO), cobalt oxide (Co 3 O 4 ) and NiO–Co 3 O 4 nanocomposites in different compositions (10%, 20%, 30% and 40%) were successfully synthesized through hydrothermal method, optimizing concentrations of the precursors, and X-ray diffraction confirmed single-phase polycrystalline NiO and Co 3 O 4 . SEM images showed that distinct morphologies for each material and FTIR spectra reveal Ni–O and Co–O. UV–visible analysis shows a plasmon peak at 307 nm for NiO and excition absorption at 282 nm for Co 3 O 4. NiO–Co 3 O 4 nanocomposites displayed band gaps ranging from 2.37 eV to 2.67 eV. Dielectric properties showed a decrease in εʹ with frequency, attributed to Maxwell–Wagner and hopping models. AC conductivity increased with frequency due to Co 3 O 4 content and oxygen vacancies. The study suggests potential applications in supercapacitors, spintronics, high-frequency devices and ultra-high dielectric materials.
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DOI: 10.1007/s13738-024-03129-0
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