From tunable core-shell nanoparticles to plasmonic drawbridges: Active control of nanoparticle optical properties

• Published in: Science advances Vol. 1; no. 11; p. e1500988
• Main Authors: Byers, Chad P, Zhang, Hui, Swearer, Dayne F, Yorulmaz, Mustafa, Hoener, Benjamin S, Huang, Da, Hoggard, Anneli, Chang, Wei-Shun, Mulvaney, Paul, Ringe, Emilie, Halas, Naomi J, Nordlander, Peter, Link, Stephan, Landes, Christy F
• Format: Journal Article
• Language: English
• Published: United States American Association for the Advancement of Science 01-12-2015
• Subjects: Nanomaterials; SciAdv r-articles; Nanoparticles; optical properties; materials science; charge transfer plasmon; interparticle gaps; active plasmonics
• ISSN: 2375-2548; 2375-2548
• DOI: 10.1126/sciadv.1500988

The optical properties of metallic nanoparticles are highly sensitive to interparticle distance, giving rise to dramatic but frequently irreversible color changes. By electrochemical modification of individual nanoparticles and nanoparticle pairs, we induced equally dramatic, yet reversible, changes in their optical properties. We achieved plasmon tuning by oxidation-reduction chemistry of Ag-AgCl shells on the surfaces of both individual and strongly coupled Au nanoparticle pairs, resulting in extreme but reversible changes in scattering line shape. We demonstrated reversible formation of the charge transfer plasmon mode by switching between capacitive and conductive electronic coupling mechanisms. Dynamic single-particle spectroelectrochemistry also gave an insight into the reaction kinetics and evolution of the charge transfer plasmon mode in an electrochemically tunable structure. Our study represents a highly useful approach to the precise tuning of the morphology of narrow interparticle gaps and will be of value for controlling and activating a range of properties such as extreme plasmon modulation, nanoscopic plasmon switching, and subnanometer tunable gap applications.