We analyzed the surface atomic structure of highly oriented pyrolytic graphite (HOPG) substrate exfoliated with adhesive tape, using high‐resolution transmission electron microscopy and scanning transmission electron microscopy‐electron energy‐loss spectroscopy (STEM‐EELS). The surface step height of the exfoliated HOPG substrate was determined using high‐angle annular dark‐field‐scanning transmission electron microscopy (HAADF‐STEM) images and the depth profiles of the EELS spectra of a cross‐sectioned thin foil specimen prepared via focused ion beam milling. The exfoliated surface of the HOPG substrate presented disordered and curved graphene layers. The STEM‐EELS measurements indicated that upon exfoliation, the surface of the HOPG substrate reacted with atmospheric water and oxygen molecules.

中文翻译：

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使用HRTEM‐EELS对剥落的HOPG表面进行横截面结构表征

我们使用高分辨率透射电子显微镜和扫描透射电子显微镜-电子能量损失谱（STEM-EELS）分析了剥落胶带的高取向热解石墨（HOPG）基板的表面原子结构。使用高角度环形暗场扫描透射电子显微镜（HAADF‐STEM）图像和通过聚焦离子制备的横截面薄片样品的EELS光谱深度图确定了剥落的HOPG基材的表面台阶高度光束铣削。HOPG基材的剥落表面呈现无序和弯曲的石墨烯层。STEM-EELS测量表明，剥离后，HOPG基材的表面会与大气中的水和氧气分子发生反应。