Size-Dependent Surface Plasmon Resonance Broadening in Nonspherical Nanoparticles: Single Gold Nanorods
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- 作者：Vincent Juv茅 ; M. Fernanda Cardinal ; Anna Lombardi ; Aur茅lien Crut ; Paolo Maioli ; Jorge P茅rez-Juste ; Luis M. Liz-Marz谩n ; Natalia Del Fatti ; Fabrice Vall茅e
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：May 8, 2013
- 年：2013
- 卷：13
- 期：5
- 页码：2234-2240
- 全文大小：379K
- 年卷期：v.13,no.5(May 8, 2013)
- ISSN：1530-6992
文摘
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.