title: GoldHelix: Gold Nanoparticles Forming 3D Helical Superstructures with Controlled Morphology and Strong Chiroptical Property.
abstract: Plasmonic nanoparticles, particularly gold nanoparticles (GNPs) hold a great potential as structural and functional building blocks for three-dimensional (3D) nanoarchitectures with specific optical applications. However, a rational control of their assembly into nanoscale superstructures with defined positioning and overall arrangement still remains challenging. Herein, we propose a solution to this challenge by using as building blocks: (1) nanometric silica helices with tunable handedness and sizes as a matrix and (2) GNPs with diameter varying from 4 to 10 nm to prepare a collection of helical GNPs superstructures (called Goldhelices hereafter). These nanomaterials exhibit well-defined arrangement of GNPs following the helicity of the silica template. Strong chiroptical activity is evidenced by circular dichroism (CD) spectroscopy at the wavelength of the surface plasmon resonance (SPR) of the GNPs with a anisotropy factor (g-factor) of the order of 1 × 10-4, i.e., 10-fold larger than what is typically reported in the literature. Such CD signals were simulated using a coupled dipole method which fit very well the experimental data. The measured signals are 1-2 orders of magnitude lower than the simulated signals, which is explained by the disordered GNPs grafting, the polydispersity of the GNPs, and the dimension of the nanohelices. These Goldhelices based on inorganic templates are much more robust than previously reported organic-based chiroptical nanostructures, making them good candidates for complex hierarchical organization, providing a promising approach for light management and benefits in applications such as circular polarizers, chiral metamaterials, or chiral sensing in the visible range.
authors.affiliation: Chimie et Biologie des Membranes et des Nanoobjets (CBMN), CNRS - Université Bordeaux - Bordeaux INP, UMR 5248 , Allée St Hilaire, Bat B14, 33607 Pessac, France.
authors.forename: Jiaji
authors.initials: J
authors.lastname: Cheng
authors.affiliation: Chimie et Biologie des Membranes et des Nanoobjets (CBMN), CNRS - Université Bordeaux - Bordeaux INP, UMR 5248 , Allée St Hilaire, Bat B14, 33607 Pessac, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Le Saux
authors.affiliation: Chimie et Biologie des Membranes et des Nanoobjets (CBMN), CNRS - Université Bordeaux - Bordeaux INP, UMR 5248 , Allée St Hilaire, Bat B14, 33607 Pessac, France.
authors.forename: Jie
authors.initials: J
authors.lastname: Gao
authors.affiliation: Institut des Sciences Moléculaires (ISM), Université Bordeaux-CNRS, UMR 5255 , 351 Cours de la Libération, 33405 Talence, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Buffeteau
authors.affiliation: Laboratoire de Chimie et Physique - Approche Multi-échelles des milieux Complexes (LCP-A2MC), Université de Lorraine , 1 Boulevard Arago, 57078 Metz, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Battie
authors.affiliation: Centre de Recherche Paul Pascal (CRPP), Université Bordeaux-CNRS-UPR 8641 , Avenue du Dr Albert Schweitzer, 33600 Pessac, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Barois
authors.affiliation: Centre de Recherche Paul Pascal (CRPP), Université Bordeaux-CNRS-UPR 8641 , Avenue du Dr Albert Schweitzer, 33600 Pessac, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Ponsinet
authors.affiliation: Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), CNRS-UPR 9048 , 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France.
authors.forename: Marie-Hélène
authors.initials: MH
authors.lastname: Delville
authors.affiliation: Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR 7504 CNRS-Université de Strasbourg , 23 Rue du Loess, 67034 Strasbourg, France.
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Ersen
authors.affiliation: Chimie et Biologie des Membranes et des Nanoobjets (CBMN), CNRS - Université Bordeaux - Bordeaux INP, UMR 5248 , Allée St Hilaire, Bat B14, 33607 Pessac, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Pouget
authors.affiliation: Chimie et Biologie des Membranes et des Nanoobjets (CBMN), CNRS - Université Bordeaux - Bordeaux INP, UMR 5248 , Allée St Hilaire, Bat B14, 33607 Pessac, France.
authors.forename: Reiko
authors.identifier: 0000-0003-3273-8635
authors.initials: R
authors.lastname: Oda
keywords: chiral nanostructures; chiroptical properties; circular dichroism of plasmon; gold nanoparticles; plasmonic nanoparticles; silica