Surface-enhanced Raman spectroscopy of CdSe quantum dots on nanostructured plasmonic surfaces
Surface-enhanced Raman spectroscopy of CdSe quantum dots on nanostructured plasmonic surfaces
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DOI：
10.1063/1.3243982
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发表时间：
2009-10-05
影响因子：
4
通讯作者：
Mahajan, Sumeet
中科院分区：
文献类型：
--
作者：
Hugall, James T.;Baumberg, Jeremy J.;Mahajan, Sumeet
虽然量子点（QDs）被广泛用作荧光团，但迄今为止还没有被用作拉曼标签。在这里，我们展示了CdSe量子点附着在纳米结构等离子体表面的（共振）表面增强拉曼散射（SERS）。在514、633和785 nm激光激发下，观察到208 cm(-1) CdSe纵向光学声子模式。将SERS信号调谐到与局域表面等离子体共振，揭示了光吸收和发射对量子点SERS的影响。局域等离子体在梯度纳米空洞样品上的等效调谐显示出强烈的共振SERS增强。这些结果为利用量子点作为SERS标记铺平了道路。(C) 2009年美国物理研究所。(doi: 10.1063/1.3243982)
Although quantum dots (QDs) are widely used as fluorophores they have not so far been used as Raman labels. Here we demonstrate (resonant) surface-enhanced Raman scattering (SERS) of CdSe QDs attached to nanostructured plasmonic surfaces. The 208 cm(-1) CdSe longitudinal optical phonon mode is observed for laser excitation at 514, 633, and 785 nm. Tuning the SERS signal into resonance with the localized surface plasmon reveals the effects of optical absorption and emission on QD SERS. Equivalent tuning of the localized plasmons on graded nanovoid samples shows strong resonant SERS enhancements. These results pave the way for exploiting QDs as SERS markers. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3243982]