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The influence of seed layer electroplating time on structural properties, optical energy bandgap, diameter, growth orientation and surface roughness of ZnO nanorods

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Abstract

In this paper, the influence of the seed layer electroplating time (tseed layer) on the structural properties, optical energy bandgap, diameter, growth orientation and surface roughness of zinc oxide (ZnO) nanorods (NRs) electrochemically deposited from an oxygenated aqueous zinc chloride electrolyte solution was studied. Prior to actual electrochemical fabrication of subsequent ZnO NRs, the ZnO seed layers were first electroplated on the indium tin oxide (ITO) covered glass substrates at different tseed layer values of 25 s, 50 s and 100 s under a constant current density. The subsequent ZnO NRs were electrochemically deposited on the prepared ZnO seed layers at a constant cathode potential. For comparison, the ZnO NRs was also deposited on the ITO-covered glass substrates without a seed layer (tseed layer = 0 s). The surface morphologies of the ZnO NRs were characterized using an atomic force microscopy and a scanning electron microscopy. The results revealed that the shape of the ZnO NRs is affected by the tseed layer value and the diameter and surface roughness of the ZnO NRs can be reduced considerably by controlling the tseed layer. The ZnO sample grown at the tseed layer of 50 s consisted of completely hexagonal-shaped NRs with the smallest mean diameter and exhibited the smoothest top surface. X-ray diffraction measurements confirmed the creation of the hexagonal wurtzite crystal structure for all samples. The ZnO NRs fabricated at the tseed layer of 50 s displayed the best preferential growth orientation along c-axis. Structural analysis also showed that the samples have nano-sized crystallites ranging from 50 to 56 nm. The ZnO NRs without the seed layer had an energy bandgap of 3.318 eV while the ZnO NRs prepared on the seed layers exhibited an energy bandgap value in the range of 3.370 ± 0.006 eV, which was inversely proportional to the mean crystallite size of the samples.

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Acknowledgements

The authors thank İbrahim Çağdaş Denizli for taking AFM images of the samples. We would also like to thank Malik Kaya and Hakkı Erkan Kaygısız for their assistances in fabrication process of the samples.

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Authors and Affiliations

  1. Department of Science Education, Bartın University, 74100, Bartın, Turkey

    Umut Saraç

  2. Department of Metallurgical and Materials Engineering, Eskisehir Osmangazi University, 26480, Eskişehir, Turkey

    M. Celalettin Baykul

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  1. Umut Saraç
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  2. M. Celalettin Baykul
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Correspondence to Umut Saraç.

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Saraç, U., Baykul, M.C. The influence of seed layer electroplating time on structural properties, optical energy bandgap, diameter, growth orientation and surface roughness of ZnO nanorods. J Mater Sci: Mater Electron 32, 26578–26587 (2021). https://doi.org/10.1007/s10854-021-07034-7

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