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

S. J. Rezvani; A. D'Elia; S. Macis; S. Nannarone; S. Lupi; F. Schütt; F. Rasch; R. Adelung; B. Lu; Z. Zhang; L. Qu; X. Feng; A. Romani Vázquez; A. Marcelli

doi:10.1016/j.diamond.2020.108171

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

S. J. Rezvani^*, A. D'Elia, S. Macis, S. Nannarone, S. Lupi, F. Schütt, F. Rasch, R. Adelung, B. Lu, Z. Zhang, L. Qu, X. Feng, A. Romani Vázquez, A. Marcelli

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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.

Original language	English
Article number	108171
Journal	Diamond and Related Materials
Volume	111
DOIs	https://doi.org/10.1016/j.diamond.2020.108171
Publication status	Published - Jan 2021

Keywords

Dichroism
Graphene
Macroporous
Sponges
X-ray absorption spectroscopy

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Rezvani, S. J., D'Elia, A., Macis, S., Nannarone, S., Lupi, S., Schütt, F., Rasch, F., Adelung, R., Lu, B., Zhang, Z., Qu, L., Feng, X., Vázquez, A. R., & Marcelli, A. (2021). Structural anisotropy in three dimensional macroporous graphene: A polarized XANES investigation. Diamond and Related Materials, 111, Article 108171. https://doi.org/10.1016/j.diamond.2020.108171

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title = "Structural anisotropy in three dimensional macroporous graphene: A polarized XANES investigation",

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.",

keywords = "Dichroism, Graphene, Macroporous, Sponges, X-ray absorption spectroscopy",

author = "Rezvani, {S. J.} and A. D'Elia and S. Macis and S. Nannarone and S. Lupi and F. Sch{\"u}tt and F. Rasch and R. Adelung and B. Lu and Z. Zhang and L. Qu and X. Feng and V{\'a}zquez, {A. Romani} and A. Marcelli",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = jan,

doi = "10.1016/j.diamond.2020.108171",

language = "English",

volume = "111",

journal = "Diamond and Related Materials",

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TY - JOUR

T1 - Structural anisotropy in three dimensional macroporous graphene

T2 - A polarized XANES investigation

AU - Rezvani, S. J.

AU - D'Elia, A.

AU - Macis, S.

AU - Nannarone, S.

AU - Lupi, S.

AU - Schütt, F.

AU - Rasch, F.

AU - Adelung, R.

AU - Lu, B.

AU - Zhang, Z.

AU - Qu, L.

AU - Feng, X.

AU - Vázquez, A. Romani

AU - Marcelli, A.

PY - 2021/1

Y1 - 2021/1

N2 - 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.

AB - 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.

KW - Dichroism

KW - Graphene

KW - Macroporous

KW - Sponges

KW - X-ray absorption spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85096439114&partnerID=8YFLogxK

U2 - 10.1016/j.diamond.2020.108171

DO - 10.1016/j.diamond.2020.108171

M3 - Article

AN - SCOPUS:85096439114

SN - 0925-9635

VL - 111

JO - Diamond and Related Materials

JF - Diamond and Related Materials

M1 - 108171

ER -

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

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Keywords

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