| Autor: |
Julia Y. Lin, Warefta Hasan, Alex Robles, Teri W. Odom, Kelsey A. Stoerzinger |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
The Journal of Physical Chemistry Letters. 1:1046-1050 |
| ISSN: |
1948-7185 |
| DOI: |
10.1021/jz100095b |
| Popis: |
This Letter describes how gold pyramidal nanoshells (nanopyramids) can be assembled into low- and high-order structures by varying the rate of solvent evaporation and surface wettability. Single-particle and individual-cluster dark field scattering spectra on isolated dimers and trimers of nanopyramids were compared. We found that the short-wavelength resonances blue-shifted as the particles assembled; the magnitude of this shift was greater for high-order structures. To test which assembled architecture supported a larger Raman-active volume, we compared their surface-enhanced Raman scattering (SERS) response of the resonant Raman molecule methylene blue (λex = 633 nm). We discovered that high-order structures exhibited more Raman scattering compared to low-order assemblies. Finite difference time domain modeling of nanopyramid assemblies revealed that the highest electromagnetic field intensities were localized between adjacent particle faces, a result that was consistent with the SERS observations. Thu... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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