Abstract
Highly ordered arrays of nanoparticles exhibit many properties that are not found in their disordered counterparts. However, these nanoparticle superlattices usually form in a far-from-equilibrium dewetting process, which precludes the use of conventional patterning methods owing to a lack of control over the local dewetting dynamics. Here, we report a simple yet efficient approach for patterning such superlattices that involves moulding microdroplets containing the nanoparticles and spatially regulating their dewetting process. This approach can provide rational control over the local nucleation and growth of the nanoparticle superlattices. Using DNA-capped gold nanoparticles as a model system, we have patterned nanoparticle superlattices over large areas into a number of versatile structures with high degrees of internal order, including single-particle-width corrals, single-particle-thickness microdiscs and submicrometre-sized ‘supra-crystals’. Remarkably, these features could be addressed by micropatterned electrode arrays, suggesting potential applications in bottom-up nanodevices.
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Acknowledgements
The authors thank J. Jung-Jen Li, J. Kahn, M. Campolongo, V. Pinskiy and V.L. Morales for technical help and discussions. The work is partially supported by NYSTAR and NSF CAREER award (grant number 0547330). The authors also thank J.C. March for proof-reading this manuscript. N.P. wishes to acknowledge the Korea Research Foundation Grant (04-03-05-2) for support.
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W.L.C. and D.L. conceived and designed the experiments. W.L.C., N.P. and M.R.H. performed the experiments. W.L.C. and D.L. analysed the data. W.L.C., N.P., M.T.W., M.R.H. and D.L. co-wrote the paper. All authors discussed the results and commented on the manuscript.
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Cheng, W., Park, N., Walter, M. et al. Nanopatterning self-assembled nanoparticle superlattices by moulding microdroplets. Nature Nanotech 3, 682–690 (2008). https://doi.org/10.1038/nnano.2008.279
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DOI: https://doi.org/10.1038/nnano.2008.279
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