Dielectric behavior and transport properties of ZnO nanorods |
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| Authors: | M Soosen Samuel Jiji Koshy Anoop Chandran KC George |
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| Institution: | 1. Department of Electrical Engineering, NUST College of Electrical and Mechanical Engineering (CEME), National University of Sciences and Technology (NUST) Islamabad, 44000, Pakistan;2. Magnetism Laboratory, Department of Physics, Quaid-i-Azam University Islamabad, 44000, Pakistan;3. Department of Physics, Forman Christian College (University), Lahore 54000, Pakistan;4. Materials Science & Engineering, University of Washington, Seattle, WA, USA;5. Spintronics Laboratory, Department of Physics, International Islamic University, Islamabad, 44000, Pakistan;6. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS) Beijing, 100190, China;7. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;8. Department of Physics, COMSATS Institute of Information Technology Islamabad, 44000, Pakistan;9. Department of Physics, Government Postgraduate College No.1 Abbottabad, Pakistan;10. Experimental Accelerator Physics Laboratory, National Centre for Physics Islamabad, 44000, Pakistan;1. State Key Laboratory of Integrated Service Networks, School of Telecommunications Engineering, Xidian University, Xi''an 710071, China;2. School of Physics and Optoelectronic Engineering, Xidian University, Xi''an 710071, China;1. Crystal Lab, Department of Physics & Astrophysics, University of Delhi, Delhi, 110007, India;2. Department of Electronics, SGTB Khalsa College, University of Delhi, Delhi, 110007, India;1. P.G & Research Department of Physics, Sri Paramakalyani College, Alwarkurichi, India;2. Department of Physics, Indian School of Mines, Dhanbad, India;1. Department of Materials Science, Univesity of Patras, Greece;2. Key Laboratory for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, and School of Materials Science and Engineering, Henan University, Kaifeng, Henan 475001, China;3. Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany;4. Russian-Armenian University, H. Emin 123, 0051 Yerevan, Armenia |
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| Abstract: | Highly optical, good crystalline and randomly aligned ZnO nanorods were synthesized by the hydrothermal method. The dielectric properties of ZnO nanorods were attributed to the interfacial polarization at low frequencies (below 10 kHz) and orientational polarization at higher frequencies. The observed ω(n?1) dependence of dielectric loss was discussed on the basis of the Universal model of dielectric response. Dielectric loss peak was composed of the Debye like loss peak at higher frequencies and interfacial loss peak at lower frequencies. Charge transport through the grain and grain boundary region was investigated by impedance spectroscopy. At higher temperatures the conductivity of the nanorod was mainly through the grain interior and the overall impedance was contributed by the grain boundary region. The activation energy of nanorod was calculated as 0.078 eV, which is slightly higher than the reported bulk value. |
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