Three dimensional sensitivity characterization of plasmonic nanorods for refractometric biosensors
| Autor: | Ulrich Hohenester, Alfred Leitner, Andreas Trügler, Markus K. Krug, Joachim R. Krenn, V. Leitgeb, Andreas Hohenau, Stefan Köstler |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanostructure Physics::Optics Metal Nanoparticles 02 engineering and technology Dielectric Biosensing Techniques 010402 general chemistry 01 natural sciences Optics Polymethyl Methacrylate General Materials Science Sensitivity (control systems) Surface plasmon resonance Plasmon Nanotubes business.industry Surface Plasmon Resonance 021001 nanoscience & nanotechnology Silicon Dioxide 0104 chemical sciences Microscopy Electron Scanning Quartz Crystal Microbalance Techniques Particle Nanorod Gold 0210 nano-technology business Refractive index |
| Zdroj: | Nanoscale. 8(5) |
| ISSN: | 2040-3372 |
| Popis: | An experimental three dimensional characterization of the local refractive index sensitivity of plasmonic gold nanorods is performed by controlled apposition of lithographic nanostructures. We show up to seven times higher sensitivity values to local changes in the refractive index at the particle tip than center. In addition, successive deposition of defined nm-thin dielectric layers on nanorods covered with stripe masks allows us to study the sensitivity decrease normal to the particle surface separately for different particle sites. Clear trends to a stronger sensitivity decay at sites of higher local sensitivity are demonstrated experimentally and theoretically. Our sensitivity characterization provides an important tool to find the most suitable particle type and particle site for specific bio-sensing applications. |
| Databáze: | OpenAIRE |
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