期刊
MICROSCOPY
卷 64, 期 2, 页码 143-150出版社
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfu115
关键词
scanning transmission electron microscopy; annular dark-field imaging; quantitative analysis; graphene; image simulation
类别
资金
- JST Research Acceleration Program
- Nano Platform Program of MEXT, Japan
A quantification procedure for annular dark-field (ADF) imaging, in which a quantitative contrast is given as a scattering intensity normalized by an incident probe current, is presented. The obtained ADF images are converted to quantitative ADF images using an empirical equation, which is a function of an ADF imaging system setting. The quantification procedure fully implements the nonlinear response of the ADF imaging system, which is critical in high-sensitivity observation. We applied the procedure for observation of a graphene specimen with 1-4 layers. The inner and outer angles of an ADF detector, which are important parameters in quantitative analyses, were precisely measured. The quantitative contrast of ADF images was in agreement with that of simulated images, and the quantitative ADF imaging allowed us to directly count the number of graphene layers.
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