Piezoelectric, dielectric, optical and electrical characterization of solution grown flower-like ZnO nanocrystal |
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Authors: | M.K. Gupta B.K. Singh K. Kumar |
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Affiliation: | a Crystal Lab, Department of Physics and Astrophysics, University of Delhi, Delhi-7, India b Department of Physics and Electronics, SGTB Khalsa College, University of Delhi, Delhi-7, India |
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Abstract: | Flower-like ZnO nanocrystals were grown by low temperature solution technique after controlling Zn2+/OH− ratio. The morphology and structural studies confirmed the formation of nano structure, revealing the [0001] oriented growth of the ZnO nanorods. The variation of dielectric constant, loss, ac conductivity and activation energy as a function of frequency was studied. In UV-Vis absorption spectra, a sharp absorption band-edge at 355 nm is observed from which direct optical band gap 3.40 eV was calculated. In P-E hysteresis piezoelectric characterization for unpoled ZnO, the value of remnant polarization and coercive field was found to be 16.31 µC/cm2 and 6.11 kV/cm respectively which increased to 25.65 µC/cm2 and 8.35 kV/cm, respectively after poling at 1 kV/cm. The piezoelectric charge coefficient (d33) was found to be 1.7 pC/N. |
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Keywords: | Nanomaterials Piezoelectric materials X-ray techniques Dielectrics |
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