Nanotopography of graphene

Nanotopography of graphene
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石墨烯的纳米形貌

DOI:
10.1002/pssa.200982207
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发表时间:
2009
期刊:
physica status solidi (a)
影响因子:
--
通讯作者:
Bangert U
Bangert U
中科院分区:
--
文献类型:
--
作者:
Bangert U

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通过原子分辨率高角度暗场成像和电子能量损失光谱检查微观清洁石墨烯表面是否存在吸附原子。碳原子可以在暗场图像中观察到,而氢则在电子损失光谱中显示。光谱图像显示了氢在原始和刻意加氢的石墨烯中的空间分布;氢在所有石墨烯表面都存在,但在剂量样品中覆盖率更高,更均匀。在干净的表面上,能量损失是原子氢的地面激发的特征,而在碳氢化合物沉积物中发现氢能量水平的分布。利用快速傅里叶变换(FFT)技术对晶格图像进行处理,揭示了石墨烯片中的涟漪效应。这种对比效应源于由于薄片的倾斜而引起的键长投影的变化。指出点缺陷-空位和ad -原子-影响波纹图案。
Microscopically clean graphene surfaces are scrutinized via atomic resolution high angle dark field imaging and electron energy loss spectroscopy for presence of adsorbed atoms. Carbon ad‐atoms can be observed in dark field images, whereas hydrogen is revealed in electron loss spectra. Spectrum images show the spatial distribution of hydrogen in pristine and deliberately H‐dosed graphene; hydrogen is found on all graphene surfaces but the coverage is higher and more uniform in dosed samples. On clean surfaces the energy loss is characteristic of the ground level excitation in atomic hydrogen, whereas a spread in the hydrogen energy levels is found in hydrocarbon deposits. A rippling effect in the graphene sheets is revealed when lattice images are processed using fast Fourier transform (FFT) techniques. This contrast effect originates from changes in the bond length projection, due to inclinations of the sheet. It is suggested that point defects – vacancies and ad‐atomes – influence the ripple patterns.
DOI: --
发表时间: 2005
影响因子: 2.8
作者:
N. Borglund;P;S. Csillag
通讯作者: S. Csillag
甲烷、乙烷、丙烷、异丁烷和新戊烷分子轨道的光电子能谱关联
DOI: --
发表时间: 1972
期刊:
影响因子: --
作者:
J. Murrell;W. Schmidt
通讯作者: W. Schmidt
DOI: 10.1038/nnano.2008.280
发表时间: 2008-11-01
影响因子: 38.3
作者:
Gass, Mhairi H.;Bangert, Ursel;Geim, A. K.
通讯作者: Geim, A. K.