Plasmonic Core–Satellite Assemblies as Highly Sensitive Refractive Index Sensors
| Autor: | Jan Becker, Janak Prasad, George Fytas, Carsten Sönnichsen, Amelie H. R. Koch, Ute Kolb, Robert Branscheid, Inga Zins |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Nanostructure business.industry Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Core (optical fiber) Wavelength General Energy Optoelectronics Physical and Theoretical Chemistry Surface plasmon resonance 0210 nano-technology business Biosensor Refractive index Plasmon |
| Zdroj: | The Journal of Physical Chemistry C. 119:5577-5582 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp510985n |
| Popis: | Highly sensitive and spectrally tunable plasmonic nanostructures are of great demand for applications such as SERS and parallel biosensing. However, there is a lack of such nanostructures for the midvisible spectral regions as most available chemically stable nanostructures offer high sensitivity in the red to far red spectrum. In this work, we report the assembly of highly sensitive nanoparticle structures using a hydroxylamine mediated core–satellite assembly of 20 nm gold nanoparticle satellites onto 60 nm spherical gold cores. The average number of satellites allows tuning the plasmon resonance wavelength from 543 to 575 nm. The core–satellite nanostructures are stable in pH ranges from 5 to 9 and show about 2-fold higher plasmonic sensitivity than similar sized gold nanospheres. |
| Databáze: | OpenAIRE |
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