Dielectric and magnetic properties of Allium cepa and Raphanus sativus extracts biogenic ZnO nanoparticles
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Dielectric and magnetic properties of Allium cepa and Raphanus sativus extracts biogenic ZnO nanoparticles P. Saravanan1, K. SenthilKannan2,*, A. Mustafa3, M. Vimalan4, M. Bououdina3, S. Balasubramanian5, M. Meena6, and S. Tamilselvan1,* 1
P.G & Research Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, Tamilnadu 604 407, India Department of Physics/R&D, Edayathangudy G.S Pillay Arts and Science College, (affiliated to Bharathidasan University - Trichirappalli-24) Nagapattinam, Tamilnadu 611 002, India 3 Department of Physics, College of Science, University of Bahrain, PO Box 32038, Menama, Kingdom of Bahrain 4 Department of Physics, Thirumalai Engineering College, Kilambi, Kanchipuram, Tamilnadu 631 551, India 5 ICAR - Central Institute of Agricultural Engineering Regional Centre, Coimbatore, Tamilnadu 641 007, India 6 Physics Research Centre, S.T. Hindu College, Nagercoil, Tamilnadu 629 002, India 2
Received: 1 July 2020
ABSTRACT
Accepted: 5 November 2020
Spherical nanoparticles of zinc oxide (ZnO NPs) have been successfully synthesized through domestic microwave oven-supported solvothermal method by using Allium cepa (Onion) and Raphanus sativus (White Radish) extracts as reducing and capping agent. X-ray powder diffraction confirms the formation of single-nanocrystalline wurtzite-type structure. SEM observations reveal spherical-shaped particles at the nanoscale, while the purity and chemical composition have been confirmed by EDAX analysis. The dielectric study confirms that the dielectric constant and dielectric loss of ZnO nanoparticles decrease with the increase in frequency while increase with the rise in temperature, signifying that the space charge contribution plays a key role in the charge transport process and polarizability. Interestingly, magnetic measurements indicate that the diamagnetic bulk ZnO undergoes magnetic transition into paramagnetic with the presence of a weak ferromagnetic component associated with oxygen vacancies.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Oxide nanoparticles (NPs) have attracted interest owing to their tremendous contributions to technological applications over the past few decades through new scientific research findings. The
properties of nanomaterials are different when compared to bulk counterparts due to their properties such as size dependence, quantum confinement and high surface-to-volume ratio [1, 2]. Among various oxide nanomaterials, metal oxide nanoparticles with distinctive behavior and excellent physicochemical
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https://doi.org/10.1007/s10854-020-04841-2
J Mater Sci: Mater Electron
properties have triggered particular interest recently and have revealed great potential in diverse applications, such as sensors, semiconductors, storage devices, measuring instruments and medical appliances [3–5]. Generally, the properties and applications of metal oxide NPs (MONPs) are closely associated with size, shap
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