One Nanometer Scale Chemical and Structural Analysis of Carbon Nanotubes by STM Tip Enhanced Raman Imaging in Ambient Condition.

本研究将扫描隧道显微镜（STM）与近场拉曼光谱技术相结合，实现了近场拉曼光谱与扫描隧道显微镜的混合成像和化学分析。由于单壁碳纳米管具有很强的拉曼信号和清晰的形貌，因此被选为我们的探针增强拉曼光谱（TERS）的样品。我们得到了光谱分辨TERS图像在不同的拉曼模式与1.7 nm的空间分辨率。首次在真实的空间中可视化了D带的局部缺陷起源、共振条件的直径因子和管束效应。我们很高兴有这样高分辨率的仪器，它可能会改变分析化学以及光学和光谱学的观点和方法。这为研究纳米级物理、化学和生物学开辟了新的可能性。

Scanning tunneling microscope (STM) combined with near field Raman spectroscopy is constructed in this research for hybrid imaging and chemical analysis. SWNT is selected as our sample for tip enhanced Raman spectroscopy (TERS) because it has very strong Raman signal and clear morphology. We obtained spectrally resolved TERS images at different Raman modes with 1.7 nm spatial resolution. For the first time, the local defect origin of D band, diameter factor of resonance condition, and tube bundling effect are all visualized in real space. We are so exciting to have such high resolution tool and it may change the views and ways of analytical chemistry as well as optics and spectroscopy. This opens new possibilities to investigate nanoscale physics, chemistry, and biology.