Antibonding Plasmon Modes in Colloidal Gold Nanorod Clusters
| Autor: | Weihai Ni, Maurizio Prato, Jorge Pérez-Juste, Stefano A. Mezzasalma, Marek Grzelczak, Paolo Fornasiero, Yury Herasimenka, Luigi Feruglio, Tiziano Montini, Luis M. Liz-Marzán |
|---|---|
| Přispěvatelé: | Grzelczak, M., Mezzasalma, S. A., Ni, W., Herasimenka, Y., Feruglio, L., Montini, Tiziano, Perez Juste, J., Fornasiero, Paolo, Prato, Maurizio, Liz Marzán, L. M. |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Plasmons
Materials science Surface Properties Ultraviolet Rays Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Colloidal Gold Nanorod Clusters Phase (matter) Electrochemistry Cluster (physics) General Materials Science Colloids Particle Size Spectroscopy Plasmon Nanotubes Povidone self-assembly Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Antibonding molecular orbital Pyrrolidinones Colloidal Gold Nanorod Clusters Plasmons self-assembly 0104 chemical sciences 3. Good health Chemical physics Colloidal gold Nanorod Gold Self-assembly 0210 nano-technology |
| Zdroj: | Langmuir |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la203750d |
| Popis: | The optical response of nanoplasmonic colloids in disperse phase is strictly related to their shape. However, upon self-assembly, new optical features, for example, bonding or antibonding modes, emerge as a result of the mutual orientations of nanoparticles. The geometry of the final assemblies often determines which mode is dominating in the overall optical response. These new plasmon modes, however, are mostly observed in silico, as self-assembly in the liquid phase leads to cluster formation with a broad range of particle units. Here we show that low-symmetry clustering of gold nanorods (AuNRs) in solution can also reveal antibonding modes. We found that UV-light irradiation of colloidal dispersions of AuNRs in N-methyl-2-pyrrolidone (NMP), stabilized by poly(vinylpyrrolidone) (PVP) results in the creation of AuNRs clusters with ladderlike morphology, where antibonding modes can be identified. We propose that UV irradiation induces formation of radicals in solvent molecules, which then promote cross-linking of PVP chains on the surface of adjacent particles. This picture opens up a number of relevant questions in nanoscience and is expected to find application in light induced self-assembly of particles with various compositions and morphologies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|