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Physical and magnetic properties of (Co, Ag) doped ZnO nanoparticles

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Abstract

Undoped and (Co, Ag) co-doped ZnO nanostructure powders are synthesized by chemical precipitation method without using any capping agent and annealed in air ambient at 500 °C for 1 h. Here, the Ag concentration is fixed at 5 mol% and Co concentration is increased from 0 to 5 mol%. The X-ray diffraction studies reveal that undoped and doped ZnO powders consist of pure hexagonal structure and nano-sized crystallites. The novel Raman peak at 530 cm−1 has corroborated with the Co doped ZnO nanoparticles. Moreover, the PL studies reveal that as the Co doping concentration increases and it enters into ZnO lattice as substitutional dopant, it leads to the increase of oxygen vacancies (Vo) and zinc interstitials (Zni). From the magnetization measurements, it is noticed that the co-doped ZnO nanostructures exhibit considerably robust ferromagnetism i.e. 4.29 emu g−1 even at room temperature. These (Co, Ag) co-doped ZnO nanopowders can be used in the fabrication of spintronic and optoelectronic device applications.

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Acknowledgments

The authors wish to express their gratitude to Dr. B. K. Reddy (Retd.), Department of Physics, S.V. University, Tirupati and Prof. Y. Prabhakara Reddy, Department of Physics, Sri Padmavati Mahila Visvavidyalayam, Tirupati for the help. Dr. N. K. Reddy wishes to acknowledge the CSIR for the sanction of Senior Research Associate ship under the scheme of Scientist’s pool (No. 13 (8525-A) 2011-Pool).

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Authors and Affiliations

  1. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, Andhra Pradesh, India

    B. Sankara Reddy & S. Venkatramana Reddy

  2. Center for Nanoscience and Engineering (CeNSE), Indian Institute of Science, Bangalore, 560 012, India

    N. Koteeswara Reddy

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  1. B. Sankara Reddy
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Correspondence to S. Venkatramana Reddy.

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Sankara Reddy, B., Venkatramana Reddy, S. & Koteeswara Reddy, N. Physical and magnetic properties of (Co, Ag) doped ZnO nanoparticles. J Mater Sci: Mater Electron 24, 5204–5210 (2013). https://doi.org/10.1007/s10854-013-1545-z

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