Volume 58, Issue 10 pp. 3123-3127
Communication

Helicoidal Patterning of Nanorods with Polymer Ligands

Elizabeth Galati

Elizabeth Galati

Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6 Canada

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Huachen Tao

Huachen Tao

Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6 Canada

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Moritz Tebbe

Moritz Tebbe

Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6 Canada

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Rija Ansari

Rija Ansari

Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6 Canada

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Prof. Michael Rubinstein

Prof. Michael Rubinstein

Department of Mechanical Engineering and Materials Science, Biomedical Engineering, Physics and Chemistry, Duke University, Durham, NC, 27708 USA

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Dr. Ekaterina B. Zhulina

Corresponding Author

Dr. Ekaterina B. Zhulina

Institute of Macromolecular Compounds of the Russian Academy of Sciences, Saint Petersburg, 199004 Russia

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Prof. Eugenia Kumacheva

Corresponding Author

Prof. Eugenia Kumacheva

Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6 Canada

Institute of Biomaterials and Biomedical Engineering, Toronto, ON, M5S 3G9 Canada

Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, M5S 3E5 Canada

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First published: 02 January 2019
Citations: 38

Graphical Abstract

Gold nanorods, end-grafted with achiral polymer ligands, show a new mechanism of chiral surface patterning giving a helicoidal morphology. This morphology is dictated by the relationship between the polymer grafting density and the ratio of the polymer length to the nanorod radius.

Abstract

Chiral packing of ligands on the surface of nanoparticles (NPs) is of fundamental and practical importance, as it determines how NPs interact with each other and with the molecular world. Herein, for gold nanorods (NRs) capped with end-grafted nonchiral polymer ligands, we show a new mechanism of chiral surface patterning. Under poor solvency conditions, a smooth polymer layer segregates into helicoidally organized surface-pinned micelles (patches). The helicoidal morphology is dictated by the polymer grafting density and the ratio of the polymer ligand length to nanorod radius. Outside this specific parameter space, a range of polymer surface structures was observed, including random, shish-kebab, and hybrid patches, as well as a smooth polymer layer. We characterize polymer surface morphology by theoretical and experimental state diagrams. The helicoidally organized polymer patches on the NR surface can be used as a template for the helicoidal organization of other NPs, masked synthesis on the NR surface, as well as the exploration of new NP self-assembly modes.

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