期刊
NANO LETTERS
卷 13, 期 5, 页码 2234-2240出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl400777y
关键词
Single particle spectroscopy; gold nanorods; surface plasmon resonance; surface broadening; quantum confinement; effective length
类别
资金
- ANR [ANR-09-NANO-019-01]
- Ministere des Affaires etrangeres et europeennes under Project PHC Picasso [22930NE]
- Spanish Accion Integrada [FR2009-0034]
- Spanish Accion MINECO [MAT2010-15374]
- INL, Braga
The dependence of the spectral width of the longitudinal localized surface plasmon resonance (LSPR) of individual gold nanorods protected by a silica shell is investigated as a function of their size. Experiments were performed using the spatial modulation spectroscopy technique that permits determination of both the spectral characteristics of the LSPR of an individual nanoparticle and its morphology. The measured LSPR is shown to broaden with reduction of both the nanorod length and its diameter, which is in contrast with the predictions of existing classical and quantum theoretical models. This behavior can be reproduced assuming the LSPR width linearly depends on the inverse of an effective length proportional to the square root of the particle surface with the same slope as that recently determined for silica-coated silver nanospheres.
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