Fabrication of thin TEM sample of ionic liquid for high-resolution ELNES measurements

Tomohiro Miyata, Teruyasu Mizoguchi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Investigation of the local structure, ionic and molecular behavior, and chemical reactions at high spatial resolutions in liquids has become increasingly important. Improvements in these areas help to develop efficient batteries and improve organic syntheses. Transmission electron microscopy (TEM) and scanning-TEM (STEM) have excellent spatial resolution, and the electron energy-loss near edge structure (ELNES) measured by the accompanied electron energy-loss spectroscopy (EELS) is effective to analyze the liquid local structure owing to reflecting the electronic density of states. In this study, we fabricate a liquid-layer-only sample with thickness of single to tens nanometers using an ionic liquid. Because the liquid film has a thickness much less than the inelastic mean free path (IMFP) of the electron beam, the fine structure of the C-K edge electron energy loss near edge structure (ELNES) can be measured with sufficient resolution to allow meaningful analysis. The ELNES spectrum from the thin liquid film has been interpreted using first principles ELNES calculations.

Original languageEnglish
Pages (from-to)81-87
Number of pages7
JournalUltramicroscopy
Volume178
DOIs
Publication statusPublished - 2017 Jul 1
Externally publishedYes

Keywords

  • ELNES
  • Ionic liquid
  • Liquid
  • STEM
  • Specimen preparation
  • Theoretical calculation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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