Highlighting the Dynamics of Graphene Protection toward the Oxidation of Copper under Operando Conditions

Mattia Scardamaglia, Claudia Struzzi, Alexei Zakharov, Nicolas Reckinger, Patrick Zeller, Matteo Amati, Luca Gregoratti

Research output: Contribution to journalArticle

Abstract

We performed spatially resolved near-ambient-pressure photoemission spectromicroscopy on graphene-coated copper in operando under oxidation conditions in an oxygen atmosphere (0.1 mbar). We investigated regions with bare copper and areas covered with mono- and bi-layer graphene flakes, in isobaric and isothermal experiments. The key method in this work is the combination of spatial and chemical resolution of the scanning photoemission microscope operating in a near-ambient-pressure environment, thus allowing us to overcome both the material and pressure gap typical of standard ultrahigh-vacuum X-ray photoelectron spectroscopy (XPS) and to observe in operando the protection mechanism of graphene toward copper oxidation. The ability to perform spatially resolved XPS and imaging at high pressure allows for the first time a unique characterization of the oxidation phenomenon by means of photoelectron spectromicroscopy, pushing the limits of this technique from fundamental studies to real materials under working conditions. Although bare Cu oxidizes naturally at room temperature, our results demonstrate that such a graphene coating acts as an effective barrier to prevent copper oxidation at high temperatures (over 300 °C), until oxygen intercalation beneath graphene starts from boundaries and defects. We also show that bilayer flakes can protect at even higher temperatures. The protected metallic substrate, therefore, does not suffer corrosion, preserving its metallic characteristic, making this coating appealing for any application in an aggressive atmospheric environment at high temperatures.

Original languageEnglish
Pages (from-to)29448-29457
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number32
DOIs
Publication statusPublished - 14 Aug 2019

Fingerprint

Graphite
Graphene
Copper
Oxidation
Photoemission
X ray photoelectron spectroscopy
Oxygen
Coatings
Temperature
Ultrahigh vacuum
Intercalation
Photoelectrons
Microscopes
Corrosion
Scanning
Imaging techniques
Defects
Substrates
Experiments

Keywords

  • ambient-pressure XPS
  • coating
  • corrosion
  • operando
  • spectromicroscopy

Cite this

Scardamaglia, Mattia ; Struzzi, Claudia ; Zakharov, Alexei ; Reckinger, Nicolas ; Zeller, Patrick ; Amati, Matteo ; Gregoratti, Luca. / Highlighting the Dynamics of Graphene Protection toward the Oxidation of Copper under Operando Conditions. In: ACS Applied Materials and Interfaces. 2019 ; Vol. 11, No. 32. pp. 29448-29457.
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Highlighting the Dynamics of Graphene Protection toward the Oxidation of Copper under Operando Conditions. / Scardamaglia, Mattia; Struzzi, Claudia; Zakharov, Alexei; Reckinger, Nicolas; Zeller, Patrick; Amati, Matteo; Gregoratti, Luca.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 32, 14.08.2019, p. 29448-29457.

Research output: Contribution to journalArticle

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