Scaling the dynamic electron scattering in HAADF-imaging the graphene sheets

W. F. Ding, T. S. Chen, K. M. Liao, L. B. He, F. Q. Song, J. F. Zhou, J. G. Wan, G. H. Wang, M. Han

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

High-angle annular dark field (HAADF) imaging proves an atomic-level probe in weighing the three-dimensional nanostructures [1]. Atom-counting will become routine if an accurate knowledge of the scattering cross-section (Ω) of the realistic electrons, or the mean free path (L), is provided. However, the scattering is a dynamic process involving complex issues such as the experimental configurations, multiple electron scattering, thermal diffuse scattering and partial coherence of the electron probe [1, 2]. Ab initio prediction of the scattering constants (Ω and L) is still of much theoretical debates [3], hence their experimental determination remains an interesting topic. Within the depth of L, single scattering plays a dominant role. The collected electrons in a solid angle is given by the formula I=I 0(1-et/L), where L is the mean free path of the scattering and t is the thickness of sample films [2]. The accurate measurement of L expects a substrate with a good set of precise thicknesses. Graphene sheets (GSs), with a large L and exactly-determined layer numbers, present an ideal candidate for determining L as shown here.

Original languageEnglish
Title of host publicationProceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010
Pages644-645
Number of pages2
DOIs
StatePublished - 2010
Externally publishedYes
Event8th International Vacuum Electron Sources Conference, IVESC 2010 and NANOcarbon 2010 - Nanjing, China
Duration: 14 Oct 201016 Oct 2010

Publication series

NameProceedings - 2010 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010 and NANOcarbon 2010

Conference

Conference8th International Vacuum Electron Sources Conference, IVESC 2010 and NANOcarbon 2010
Country/TerritoryChina
CityNanjing
Period14/10/1016/10/10

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