CHENG, Jiaji; SAUX, Guillaume Le; GAO, Jie; BUFFETEAU, Thierry; BATTIE, Yann; BAROIS, Philippe; PONSINET, Virginie; DELVILLE, Marie-Hélène; ERSEN, Ovidiu; POUGET, Emilie; ODA, Reiko

doi:10.1021/acsnano.6b08723

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CHENG, Jiaji
Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

SAUX, Guillaume Le
Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

GAO, Jie
Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

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Article de revue

Ce document a été publié dans

ACS Nano. 2017-03-30, vol. 11, n° 4, p. 3806-3818

American Chemical Society

Résumé en anglais

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.....< Réduire

Mots clés en anglais

Silica

Chiral nanostructures

Chiroptical properties

Circular dichroism of plasmon

Gold nanoparticles

Plasmonic nanoparticles

DOI

http://dx.doi.org/10.1021/acsnano.6b08723

Project ANR

Initiative d'excellence de l'Université de Bordeaux

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026