A 1.7 nm resolution chemical analysis of carbon nanotubes by tip-enhanced Raman imaging in the ambient
A 1.7 nm resolution chemical analysis of carbon nanotubes by tip-enhanced Raman imaging in the ambient
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DOI：
10.1038/ncomms4312
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发表时间：
2014-02-01
影响因子：
16.6
通讯作者：
Kawata, Satoshi
中科院分区：
文献类型：
--
作者：
Chen, Chi;Hayazawa, Norihiko;Kawata, Satoshi
原子力显微镜和扫描隧道显微镜（STM）对材料的表面形态进行常规分析，精度可达亚纳米级。然而，同时研究表面化学仍然是具有挑战性的，这需要在低真空环境和液氦温度下的特定的力谱或隧道谱能力。在这里，我们展示了同时化学和结构分析的单个碳纳米管（CNT）的STM为基础的尖端增强拉曼光谱（STM-TERS）与1.7 nm的空间分辨率在环境中。在真实的空间中对不同类型碳纳米管的拉曼对比度、局部缺陷、直径和集束效应进行了可视化。脱离超真空和低温环境，我们的环境STM-TERS成像在分析CNT的局部化学方面非常强大，也适用于分析普通电子显微镜技术无法看到的原材料和软材料。
Surface morphology of materials is routinely analysed by an atomic force microscope and scanning tunneling microscope (STM) down to subnanometer precision. However, it is still challenging to investigate the surface chemistry simultaneously, which requires specific capability of force or tunneling spectroscopy in ultrahigh vacuum environment and liquid Helium temperature. Here we demonstrate the simultaneous chemical and structural analysis of individual carbon nanotubes (CNTs) by STM-based tip-enhanced Raman spectroscopy (STM-TERS) with 1.7 nm spatial resolution in the ambient. Raman contrast over different types of CNTs, local defects, diameters and bundling effect are all visualized in real space. Disengaging from ultrahigh vacuum and cryogenic environment, our ambient STM-TERS imaging is powerful in analysing local chemistry for CNTs and also suitable for analysing as-made and soft materials, which cannot be seen with general electron microscopy techniques.