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Growth of zinc oxide nanorod structures: pressure controlled hydrothermal process and growth mechanism

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Abstract

Zinc oxide (ZnO) nanorods of various morphologies are grown on zinc substrate by pressure-assisted hydrothermal process and the growth mechanism is investigated with the help of molecular dynamics (MD) simulation results. Hydrothermally reacted ZnO2 nanostructure bottom-up formation from Zn substrate is a useful process employed here. A systematic study on the role of process control parameters such as pressure and temperature on nanorod growth has been carried out. Correlation among the process parameters to form ordered nanostructures is established. The effect of pressure on the diameter and length of the grown ZnO nanorod structures is studied, which is precisely tunable. With a decrease in pressure from 500 to 400 kPa, the nanorod diameter is reduced by 22.2 %, while its length is increased by 24.8 %. At lower vapor pressure, the nanorod tips are sharper, whereas at higher vapor pressure they are flat. These variations along with a detailed analysis of MD simulations helps us hypothesize that pressure plays an important role in governing the diffusion of oxygen atom onto zinc surface and generating wurtzite phase. Simulation results clearly show that ZnO nanorods lift off due to their interaction with the Zn atoms on the substrate and the resulting forces.

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Acknowledgements

The authors acknowledge the financial support of Aeronautics R&D Board, Government of India, under the ACECOST phase-III program to carry out this research.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 560012, India

    R. Vasireddi, B. Javvaji, H. Vardhan & D. R. Mahapatra

  2. Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India

    G. M. Hegde

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  1. R. Vasireddi
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  2. B. Javvaji
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  3. H. Vardhan
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  4. D. R. Mahapatra
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  5. G. M. Hegde
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Correspondence to D. R. Mahapatra.

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Vasireddi, R., Javvaji, B., Vardhan, H. et al. Growth of zinc oxide nanorod structures: pressure controlled hydrothermal process and growth mechanism. J Mater Sci 52, 2007–2020 (2017). https://doi.org/10.1007/s10853-016-0489-0

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