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Tuning the dipole-directed assembly of core-shell nickel-coated gold nanorods

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Abstract

We present the dipole-directed assembly of nickel-coated gold nanorods into nanorings and nanowires. We used two different coating methods to synthesise these core-shell superstructures. Surprisingly, the two coating methods lead to very different kinds of dipole directed assembly. We show that the resultant dipole assembly is very sensitive to the reaction conditions and can be tuned to obtain core-shell nanochains, nanorings, and nanowires. In addition to the presented experimental work, cluster moving Monte Carlo simulations of a system of core-shell nanorods were carried out. These simulations are based on a small number of magnetic interaction energy terms and do not explicitly deal with steric interactions or van der Waals forces. The simulation results are in line with the obtained experimental results, confirming that the magnetic self-assembly of core-shell nanorods can be described by means of a relatively simple model.

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Acknowledgements

The authors would like to thank Gregor Hlawacek for operating the helium ion microscope. One of the authors (WA) acknowledges support from the Higher Education Commission in Pakistan.

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Authors and Affiliations

  1. Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE, Enschede, The Netherlands

    Chris Hellenthal, E. Stefan Kooij, Arend van Silfhout, Bene Poelsema & Harold J. W. Zandvliet

  2. Department of Physics, COMSATS Institute of Information Technology, Park Road, Islamabad, Pakistan

    Waqqar Ahmed

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  1. Chris Hellenthal
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  2. Waqqar Ahmed
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  3. E. Stefan Kooij
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  4. Arend van Silfhout
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  5. Bene Poelsema
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  6. Harold J. W. Zandvliet
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Correspondence to E. Stefan Kooij.

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Hellenthal, C., Ahmed, W., Kooij, E.S. et al. Tuning the dipole-directed assembly of core-shell nickel-coated gold nanorods. J Nanopart Res 14, 1107 (2012). https://doi.org/10.1007/s11051-012-1107-y

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