Abstract—
We have studied the influence of the size of nickel oxide nanoparticles on their resistive and capacitive properties. The nanoparticles have been synthesized by vacuum arc deposition and characterized by X-ray diffraction and electron microscopy. The results demonstrate that raising the substrate temperature from 300 to 600 K increases the size of the forming nanoparticles from 3.2 to 32.7 nm. The frequency dependences of the ac conductivity, impedance, dielectric permittivity, and dielectric loss tangent of the NiO nanoparticles in the range form 50 Hz to 5 MHz are influenced by their size. In the size range studied, the impedance spectroscopy results we obtained can be interpreted in terms of the relative fraction of interfaces. The transport properties of the 12.1-nm particles differ from those of both the larger and smaller particles, which can be understood in terms of the volume fraction of interparticle boundaries.
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Funding
This study was supported by the Russian Science Foundation, project no. 20-19-00021.
The electron-microscopic work was carried out at the Shared Research Facilities Center, Siberian Federal University, and was supported by the Russian Federation Ministry of Science and Higher Education (state research target, theme no. FSRZ-2020-0011).
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Karpov, I.V., Ushakov, A.V., Fedorov, L.Y. et al. Influence of Size and Surface Effects on Electrical Transport Properties of NiO Nanoparticles Produced in a Vacuum Arc Discharge. Inorg Mater 58, 1043–1050 (2022). https://doi.org/10.1134/S0020168522100077
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DOI: https://doi.org/10.1134/S0020168522100077