Transformation of sputtered calcium copper titanate thin film into nanorods by sequential annealing |
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Authors: | N. Tripathy S.P. Ghosh J.P. Kar |
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Affiliation: | Department of Physics and Astronomy, National Institute of Technology, Rourkela 769008, India |
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Abstract: | Rapid synthesis of long calcium copper titanate (CCTO) nanorods was carried out by sequential annealing. CCTO thin films have been deposited on p-Si substrate by RF sputtering technique and afterwards, the samples were thermally treated using a preheated furnace by varying the annealing temperature from 850 °C to 1100 °C. CCTO nanorods of 12 µm lengths and 400–600 nm diameters were synthesized at 1100 °C. Based on the FESEM observations, a plausible growth mechanism has been proposed to explain the formation of nanorods. The (220) XRD peak of the CCTO film became prominent for the annealing temperature of 950 °C. The presence of nanoscale crystals in amorphous matrix has been observed by HRTEM studies. The elemental mapping of CCTO nanorod has shown a spatial variation of elements throughout the nanorod. The oxide and interface charge density was found to be increased with the rise in annealing temperature. |
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Keywords: | Calcium copper titanate Thin films Annealing Nanorods FESEM HRTEM |
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