Spectrally Resolving Coherent TERS Spectroscopy of Electrically Biased Carbon-Coated Fibers,The Journal of Physical Chemistry C

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Spectrally Resolving Coherent TERS Spectroscopy of Electrically Biased Carbon-Coated Fibers
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-09 , DOI: 10.1021/acs.jpcc.0c05228
Sergey S. Kharintsev ₁ , Svetlana V. Saparina ₁ , Alexandr I. Fishman ₁ , Andrei A. Stolov ₂ , Jie Li ₂

Affiliation

Tip-enhanced Raman scattering (TERS) represents an advanced spectroscopic tool that enables probing a specimen on scales far beyond the diffraction limit. An investigation of two-dimensional systems reveals a striking feature of TERS, when the near-field intensity is governed by the 8th and 10th power of the tip–sample distance for the coherent and incoherent scattering cases, respectively. Physically, the coherent TERS response can be observed when the excitation spot size does not exceed the phonon coherence length. In this paper, we demonstrate spectrally resolving capabilities of coherent TERS spectroscopy when studying electrically biased amorphous carbon films. Local electro-annealing at hot spots was found to activate temperature-dependent molecular transformations such as an expansion of the defect-free sp² domains network at temperatures above 400 °C. Electro-assisted TERS allows one to directly visualize the presence of water-decorated carboxyl/hydroxyl groups at the edge carbon atoms.

中文翻译：

电偏置碳包覆光纤的光谱分辨相干TERS光谱

尖端增强拉曼散射（TERS）代表了一种先进的光谱学工具，能够在远远超过衍射极限的范围内探测标本。对二维系统的研究表明，当相干和不相干散射情况下，近场强度分别由尖端采样距离的8次和10次幂控制时，TERS的显着特征。在物理上，当激发光斑尺寸不超过声子相干长度时，可以观察到相干TERS响应。在本文中，我们展示了在研究电偏置非晶碳膜时相干TERS光谱的光谱分辨能力。发现热点上的局部电退火可激活依赖温度的分子转变，例如无缺陷sp ²的扩展网域网络在400°C以上的温度下。电辅助的TERS使人们可以直接观察边缘碳原子上水修饰的羧基/羟基的存在。

更新日期：2020-07-09

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