Charge-Driven Arrested Phase-Separation of Polyelectrolyte-Gold Nanoparticle Assemblies Leading to Plasmonic Oligomers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Colloid and Interface Science Année : 2023

Charge-Driven Arrested Phase-Separation of Polyelectrolyte-Gold Nanoparticle Assemblies Leading to Plasmonic Oligomers

Résumé

Aggregates of charged metal particles obtained by electrostatic coupling with a compound of opposite charge in the vicinity of the net zero charge ratio are of interest in the field of plasmonics because the inter-particle distance is minimal, which favours plasmonic coupling. However, these structures present a low colloidal stability limiting the development of applications. In this article we show that globally neutral aggregates formed by electrostatic complexation of citrate-stabilized gold particles and a quaternized chitosan (i.e., polycation) around the net zero charge ratio could be stabilized at a nanometric size by the subsequent addition of polyelectrolyte chains. Furthermore, the sign of the charge carried by the stabilizing chains determines the sign of the global charge carried by the stabilized complexes. The stabilization is demonstrated in saline environment on a broad pH range as well as in a cell culture media over periods of several days. Contrarily to stabilization by charged particles, our stabilized complexes are found to retain their initial characteristics (i.e. shape, size, internal structure and optical properties) after stabilization. Hence, the plasmonic coupling allows to maximize the optical absorption around the 800 nm wavelength at which the lasers used for thermoplasmonic and surface enhanced Raman scattering analysis operate.

Domaines

Matériaux
Fichier principal
Vignette du fichier
1-s2.0-S0021979722014473-main.pdf (2.26 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03766767 , version 1 (01-09-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Florent Voisin, Gérald Lelong, Jean-Michel Guigner, Thomas Bizien, Jean-Maurice Mallet, et al.. Charge-Driven Arrested Phase-Separation of Polyelectrolyte-Gold Nanoparticle Assemblies Leading to Plasmonic Oligomers. Journal of Colloid and Interface Science, 2023, 630 (A), pp.355-364. ⟨10.1016/j.jcis.2022.08.076⟩. ⟨hal-03766767⟩
44 Consultations
86 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More