期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 7, 页码 1046-1050出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz100095b
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资金
- MRSEC program of the National Science Foundation at the Materials Research Center of Northwestern University [DMR-0520513]
- NSF NSEC program at Northwestern University [EEC-0647560]
- David and Lucile Packard Foundation
- NIH Director's Pioneer Award [DPIOD003899]
- Keck Foundation
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP1OD003899] Funding Source: NIH RePORTER
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 (lambda(ex) = 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. Thus, the local spatial arrangement of the same number of nanoparticles in assembled clusters is an important design parameter. for optimizing nanoparticle-based SERS sensors.
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