Cooperative colloidal self-assembly of metal-protein superlattice wires

Ville Liljeström, Ari Ora, Jukka Hassinen, Heikki T. Rekola, Nonappa, Maria Heilala, Ville Hynninen, Jussi J. Joensuu, Robin H. A. Ras, Päivi Törmä, Olli Ikkala and Mauri A. Kostiainen ()
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Ville Liljeström: Aalto University
Ari Ora: Aalto University
Jukka Hassinen: Aalto University
Heikki T. Rekola: Aalto University
Nonappa: Aalto University
Maria Heilala: Aalto University
Ville Hynninen: Aalto University
Jussi J. Joensuu: VTT Technical Research Centre of Finland Ltd
Robin H. A. Ras: Aalto University
Päivi Törmä: Aalto University
Olli Ikkala: Aalto University
Mauri A. Kostiainen: Aalto University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Material properties depend critically on the packing and order of constituent units throughout length scales. Beyond classically explored molecular self-assembly, structure formation in the nanoparticle and colloidal length scales have recently been actively explored for new functions. Structure of colloidal assemblies depends strongly on the assembly process, and higher structural control can be reliably achieved only if the process is deterministic. Here we show that self-assembly of cationic spherical metal nanoparticles and anionic rod-like viruses yields well-defined binary superlattice wires. The superlattice structures are explained by a cooperative assembly pathway that proceeds in a zipper-like manner after nucleation. Curiously, the formed superstructure shows right-handed helical twisting due to the right-handed structure of the virus. This leads to structure-dependent chiral plasmonic function of the material. The work highlights the importance of well-defined colloidal units when pursuing unforeseen and complex assemblies.

Date: 2017
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DOI: 10.1038/s41467-017-00697-z

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