Structural anisotropy in three dimensional macroporous graphene: A polarized XANES investigation

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • S. J. Rezvani - , National Institute for Nuclear Physics (Author)
  • A. D'Elia - , National Institute for Nuclear Physics, University of Trieste (Author)
  • S. Macis - , National Institute for Nuclear Physics, University of Rome La Sapienza (Author)
  • S. Nannarone - , National Institute for Nuclear Physics (Author)
  • S. Lupi - , National Institute for Nuclear Physics, University of Rome La Sapienza (Author)
  • F. Schütt - , Kiel University (Author)
  • F. Rasch - , Kiel University (Author)
  • R. Adelung - , Kiel University (Author)
  • B. Lu - , Beijing Institute of Technology (Author)
  • Z. Zhang - , Beijing Institute of Technology (Author)
  • L. Qu - , Beijing Institute of Technology (Author)
  • X. Feng - , Chair of Molecular Functional Materials (cfaed) (Author)
  • A. Romani Vázquez - , Chair of Molecular Functional Materials (cfaed) (Author)
  • A. Marcelli - , National Institute for Nuclear Physics, Rome International Center for Materials Science, Sincrotrone Trieste (Author)

Abstract

Three-dimensional macroporous graphene sponges with different densities were investigated by angular dependent carbon K-edge X-ray Absorption Near Edge Spectroscopy (XANES) with a linearly polarized beam. The C K-edge XANES analysis shows an unexpected anisotropic behavior of the macroporous graphene random networks. The macroporous graphene sponges expectedly show an exceedingly lower dichroic ratio compared with that of the highly oriented pyrolytic graphite, but spectra clearly points out the occurrence of oriented hexagonal carbon planes. The anisotropy of the investigated samples exhibits a linear dependence with the measured density. The XANES analysis supports the presence of graphene-like, two-dimensional planar structures inside these synthetic sponges and correlates it with different structural networks and/or density in graphene sponges.

Details

Original languageEnglish
Article number108171
JournalDiamond and related materials
Volume111
Publication statusPublished - Jan 2021
Peer-reviewedYes

Keywords

Keywords

  • Dichroism, Graphene, Macroporous, Sponges, X-ray absorption spectroscopy

Library keywords