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Chiral Seeded Growth of Gold Nanorods Into Fourfold Twisted Nanoparticles with Plasmonic Optical Activity |
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| Authors: | Bing Ni Mikhail Mychinko Sergio Gómez-Graña Jordi Morales-Vidal Manuel Obelleiro-Liz Wouter Heyvaert David Vila-Liarte Xiaolu Zhuo Wiebke Albrecht Guangchao Zheng Guillermo González-Rubio José M. Taboada Fernando Obelleiro Núria López Jorge Pérez-Juste Isabel Pastoriza-Santos Helmut Cölfen Sara Bals Luis M. Liz-Marzán |
| Affiliation: | 1. Physical Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany;2. EMAT, University of Antwerp, 2020 Antwerp, Belgium NANOlab Center of Excellence, University of Antwerp, 2020 Antwerp, Belgium;3. CINBIO, Universidade de Vigo, Departamento de Química Física, Campus Universitario As Lagoas, 36310 Marcosende Vigo, Spain;4. Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain Universitat Rovira i Virgili, Avinguda Catalunya, 35, 43002 Tarragona, Spain;5. EM3WORKS, Spin-off of the University of Vigo and the University of Extremadura, PTL Valladares, 36315 Vigo, Spain;6. CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastián, Spain Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine (CIBER- BBN), 20014 Donostia-San Sebastián, Spain Department of Applied Chemistry, University of the Basque Country, 20018 Donostia-San Sebastián, Spain;7. CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastián, Spain;8. School of Physics and Microelectronics, Key laboratory of Material Physics, Ministry of Education, Zhengzhou University, Zhengzhou, 450001 P. R. China;9. Departamento de Tecnología de los Computadores y Comunicaciones, Universidad de Extremadura, 10003 Cáceres, Spain;10. Departamento de Teoría de la Señal y Comunicaciones, University of Vigo, 36310 Vigo, Spain;11. Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain;12. EMAT, University of Antwerp, 2020 Antwerp, Belgium |
| Abstract: | A robust and reproducible methodology to prepare stable inorganic nanoparticles with chiral morphology may hold the key to the practical utilization of these materials. An optimized chiral growth method to prepare fourfold twisted gold nanorods is described herein, where the amino acid cysteine is used as a dissymmetry inducer. Four tilted ridges are found to develop on the surface of single-crystal nanorods upon repeated reduction of HAuCl4, in the presence of cysteine as the chiral inducer and ascorbic acid as a reducing agent. From detailed electron microscopy analysis of the crystallographic structures, it is proposed that the dissymmetry results from the development of chiral facets in the form of protrusions (tilted ridges) on the initial nanorods, eventually leading to a twisted shape. The role of cysteine is attributed to assisting enantioselective facet evolution, which is supported by density functional theory simulations of the surface energies, modified upon adsorption of the chiral molecule. The development of R-type and S-type chiral structures (small facets, terraces, or kinks) would thus be non-equal, removing the mirror symmetry of the Au NR and in turn resulting in a markedly chiral morphology with high plasmonic optical activity. |
| Keywords: | Au nanorods chiral seeded growth plasmonic optical activity twisted nanoparticles Wulff construction |