Solution self-assembly of plasmonic Janus nanoparticles. Issue 48 (21st November 2016)

• Record Type: Journal Article
• Authors: Castro, Nicolò; Constantin, Doru; Davidson, Patrick; Abécassis, Benjamin
• Is Part Of: Soft matter. Volume 12:Issue 48(2016)
• Page Start: 9666
• Page End: 9673
• Publication Date: 2016-11-21
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c6sm01632d
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Janus nanoparticles bearing two different properties on a single particle are amenable to self-assembly into higher-order structures via their directional interaction. Abstract : Janus nanoparticles bearing two different properties on a single particle are amenable to self-assembly into higher-order structures via their directional interaction. We show that gold/silica Janus nanoparticles self-assemble in solution into clusters resembling colloidal micelles upon addition of a hydrophobic thiol which provides them with a surface active amphiphilic character. As the nanoparticles spontaneously assemble, the color of the solution evolves due to the coupling of the surface plasmons. Time resolved spectrophotometry in the visible and near-infrared ranges coupled to simulations were used to probe the assembly process. A singular value decomposition analysis reveals the presence of dimers as transient species. The structure of the clusters was probed using small angle X-ray revealing that the Janus nanoparticles assemble into clusters containing a few particles.