Correlated Super-Resolution Optical and Structural Studies of Surface-Enhanced Raman Scattering Hot Spots in Silver Colloid Aggregates
Correlated Super-Resolution Optical and Structural Studies of Surface-Enhanced Raman Scattering Hot Spots in Silver Colloid Aggregates
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DOI：
10.1021/jz200784e
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发表时间：
2011-07
影响因子：
5.7
通讯作者：
M. Weber;K. Willets
中科院分区：
文献类型：
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作者：
M. Weber;K. Willets
为了推动单分子表面增强拉曼散射（SM-SERS）领域的发展，更好地理解贵金属纳米颗粒聚集体中的胶体形态和热点性质是至关重要的。我们提出了超分辨光学研究表面增强拉曼散射（Sers）从罗丹明6 G（R6 G）分子吸附到银胶体聚集体与扫描电子显微镜（SEM）图像的这些相同的聚集体。从超分辨率拟合获得的Sers信号的散射强度图与胶体的SEM形貌图像重叠，以绘制Sers热点的形状和Sers强度波动的空间起源，分辨率低于5 nm。这些结果对开发可重复和稳定的SM-SERS基底具有重要意义。
In order to advance the field of single-molecule surface-enhanced Raman scattering (SM-SERS), a better understanding of colloid morphology and hot spot properties in noble metal nanoparticle aggregates is crucial. We present super-resolution optical studies of surface-enhanced Raman scattering (SERS) from rhodamine 6G (R6G) molecules adsorbed onto silver colloid aggregates correlated with scanning electron microscope (SEM) images of those same aggregates. The scattering intensity maps of the SERS signal, obtained from the super-resolution fits, are overlaid with SEM topographical images of the colloids to map the shape of the SERS hot spot and the spatial origin of SERS intensity fluctuations with sub-5 nm resolution. These results have vital implications for developing reproducible and robust substrates capable of SM-SERS.