Nanoindentation-enhanced tip-enhanced Raman spectroscopy
Nanoindentation-enhanced tip-enhanced Raman spectroscopy
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DOI：
10.1063/5.0056541
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发表时间：
2021-06-28
影响因子：
4.4
通讯作者：
El-Khoury, Patrick Z.
中科院分区：
文献类型：
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作者：
Wang, Chih-Feng;O'Callahan, Brian T.;El-Khoury, Patrick Z.
我们结合纳米压痕，这里使用原子力显微镜为基础的脉冲力光刻，与尖端增强拉曼光谱(TERS)和成像。我们的方法需要对平坦的Au衬底进行压痕和多模式表征，然后对压痕纳米结构进行化学功能化和光谱成像。我们发现，所得到的结构，其形状和大小取决于用于制造它们的尖端，可以支持纳米限制和显著增强的局域场。我们利用后者，展示了基于TERS的超灵敏检测/化学指纹以及化学反应成像-所有这些都使用了用于纳米光刻、地形成像、高光谱暗场光学显微镜和TERS的单一平台。
We combine nanoindentation, herein achieved using atomic force microscopy-based pulsed-force lithography, with tip-enhanced Raman spectroscopy (TERS) and imaging. Our approach entails indentation and multimodal characterization of otherwise flat Au substrates, followed by chemical functionalization and TERS spectral imaging of the indented nanostructures. We find that the resulting structures, which vary in shape and size depending on the tip used to produce them, may sustain nano-confined and significantly enhanced local fields. We take advantage of the latter and illustrate TERS-based ultrasensitive detection/chemical fingerprinting as well as chemical reaction imaging-all using a single platform for nano-lithography, topographic imaging, hyperspectral dark field optical microscopy, and TERS.