Investigation of Complex ZnO-Porous Silicon Structures with Different Dimensions Obtained by Low-Temperature Synthesis †
Zhapakov R. Murzalinov D. Begunov M. Seredavina T. Gagarina A. Spivak Y. Moshnikov V. Dmitriyeva E.A. Osipov P. Kemelbekova A.
July 2025Multidisciplinary Digital Publishing Institute (MDPI)
Processes
2025#13Issue 7
The study of the processes of low-temperature synthesis of one-dimensional particles, which are the basis for two- and three-dimensional structures, is relevant for materials science. The modified metal-stimulated electrochemical etching method made it possible to synthesize silicon nanowires with an average thickness of about 292.6 nm. Scanning electron microscopy has shown the formation of nanowires, flower-like structures, and clusters of matter after the deposition of zinc oxide on the porous surface. The hexagonal structure of ZnO crystallites was determined by X-ray diffraction spectroscopy. Studies of the initial sample by electron paramagnetic resonance (EPR) spectroscopy revealed a narrow signal in the center of the spectrum. The subtraction of the EPR spectra with a sequential increase in microwave power up to 8 mW shows the absence of saturation of the signal. This indicates an almost free flow of charges through the surface nanostructures under the influence of an external field. Heat treatment in an air atmosphere at 300 °C caused a significant increase in the intensity of the EPR spectrum. This led to an increase in the intensity of charge transfer through paramagnetic centers.
EPR , nanowires , photoluminescence , porous silicon , saturation of EPR signal , zinc oxide
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Department of Power Engineering, Institute of Energy and Mechanical Engineering named after A. Burkitbayev, Satbayev University, Almaty, 050013, Kazakhstan
Institute of Physics and Technology, Satbayev University, Almaty, 050013, Kazakhstan
Microelectronics Department, Saint-Petersburg State Electrotechnical University, Professora Popova Street, Saint-Petersburg, 197376, Russian Federation
Laboratory of Rare Metals, Republican State Enterprise National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan, RSE NC CPMRM RK, Jandossov Str, 67, Almaty, 050036, Kazakhstan
Department of Power Engineering
Institute of Physics and Technology
Microelectronics Department
Laboratory of Rare Metals
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