Measurement of the Low-Energy Electron Inelastic Mean Free Path in Monolayer Graphene

Bo Da, Yang Sun, Zhufeng Hou, Jiangwei Liu, Nguyen Thanh Cuong, Kazuhito Tsukagoshi, Hideki Yoshikawa, Shigeo Tanuma, Jin Hu, Zhaoshun Gao, Zejun Ding

Research output: Contribution to journalArticle

Abstract

Measuring the electron-transport properties of substrate-supported nanomaterials with the traditional two-point comparison method is difficult at electron energies below 50 eV, where core-level signals are too feeble to be detected against the strong secondary-electron background. Herein, a data-driven spectral analysis technique is used to study the low-energy electron-transport properties of substrate-supported target nanomaterials, while eliminating the influence of the substrate signal. Applying this technique, the electron-transport properties of the effective attenuation length and the inelastic mean free path (IMFP) can be determined with extremely high efficiency over the entire measured energy range of 6-600 eV. Further, these results show excellent agreement with other experimental and theoretical results. Significant differences are observed between monolayer graphene and the bulk graphite IMFP, which illustrates the importance of the nanometer effect in the electron-transport properties of the material. Furthermore, this technique is readily applicable to any ultrathin material that can be transferred onto a polycrystalline gold substrate.

Original languageEnglish
Article numbere44055
JournalPhysical Review Applied
Volume13
Issue number4
DOIs
Publication statusPublished - 2020 Apr

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Da, B., Sun, Y., Hou, Z., Liu, J., Cuong, N. T., Tsukagoshi, K., Yoshikawa, H., Tanuma, S., Hu, J., Gao, Z., & Ding, Z. (2020). Measurement of the Low-Energy Electron Inelastic Mean Free Path in Monolayer Graphene. Physical Review Applied, 13(4), [e44055]. https://doi.org/10.1103/PhysRevApplied.13.044055