Taking the Plunge: Nanoscale Chemical Imaging of Functionalized Gold Triangles in H2O via TERS,The Journal of Physical Chemistry C

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Taking the Plunge: Nanoscale Chemical Imaging of Functionalized Gold Triangles in H2O via TERS
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-03-14 , DOI: 10.1021/acs.jpcc.9b00867
Ashish Bhattarai ₁ , Alan G. Joly ₁ , Andrey Krayev ₂ , Patrick Z. El-Khoury ₁

Affiliation

We demonstrate fast (0.25 s/pixel) nanoscale chemical imaging in aqueous solution via tip-enhanced Raman scattering (TERS), with sub-15 nm spatial resolution. The substrate consists of 4-mercaptobenzonitrile-functionalized monocrystalline gold triangular platelets immersed in H₂O, which we map using a gold-coated atomic force microscopy probe illuminated by a 633 nm laser source. We find that the recorded TERS images trace the enhanced local optical fields that are sustained toward the edges and corners of the triangles. In effect, we directly map local optical fields of a plasmonic substrate in aqueous solution through molecular TERS. Overall, our described platform and approach may generally be used for chemical and biological imaging and, potentially, to follow chemical transformations at solid–liquid interfaces through TERS.

中文翻译：

跳水：通过TERS在H ₂ O中对功能化金三角进行纳米级化学成像

我们通过尖端增强的拉曼散射（TERS），以低于15 nm的空间分辨率，展示了水溶液中的快速（0.25 s /像素）纳米级化学成像。基质由浸入H _2中的4-巯基苯甲腈官能化的单晶金三角片组成O，我们使用被633 nm激光源照射的镀金原子力显微镜探针作图。我们发现，所记录的TERS图像跟踪了增强的局部光场，该局部光场朝向三角形的边缘和角落持续。实际上，我们通过分子TERS直接绘制了水溶液中等离激元基质的局部光场。总体而言，我们描述的平台和方法通常可用于化学和生物成像，并有可能通过TERS跟踪固液界面的化学转化。

更新日期：2019-03-15

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