Direct Fabrication of Monodisperse Silica Nanorings from Hollow Spheres – A Template for Core–Shell Nanorings
| Autor: | Koen Clays, Liwang Liu, Niels Verellen, Maarten Bloemen, Ward Brullot, Kuo Zhong, Kai Song, Jiaqi Li, Pol Van Dorpe, Alexander Volodin |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Silicon dioxide Surface plasmon Nanoparticle Nanotechnology 02 engineering and technology Surface Plasmon Resonance Silicon Dioxide 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nanostructures 0104 chemical sciences Nanoparticle Topology Magnetics chemistry.chemical_compound chemistry General Materials Science Surface plasmon resonance Reactive-ion etching 0210 nano-technology Nanospheres Plasmon Nanoring |
| Zdroj: | ACS Applied Materials & Interfaces. 8:10451-10458 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b00733 |
| Popis: | We report a new type of nanosphere colloidal lithography to directly fabricate monodisperse silica (SiO2) nanorings by means of reactive ion etching of hollow SiO2 spheres. Detailed TEM, SEM, and AFM structural analysis is complemented by a model describing the geometrical transition from hollow sphere to ring during the etching process. The resulting silica nanorings can be readily redispersed in solution and subsequently serve as universal templates for the synthesis of ring-shaped core-shell nanostructures. As an example we used silica nanorings (with diameter of ∼200 nm) to create a novel plasmonic nanoparticle topology, a silica-Au core-shell nanoring, by self-assembly of Au nanoparticles (20 nm) on the ring's surface. Spectroscopic measurements and finite difference time domain simulations reveal high quality factor multipolar and antibonding surface plasmon resonances in the near-infrared. By loading different types of nanoparticles on the silica core, hybrid and multifunctional composite nanoring structures could be realized for applications such as MRI contrast enhancement, catalysis, drug delivery, plasmonic and magnetic hyperthermia, photoacoustic imaging, and biochemical sensing. |
| Databáze: | OpenAIRE |
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