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

Scardamaglia, Mattia LU ; Struzzi, Claudia LU ; Zakharov, Alexei LU ; Reckinger, Nicolas ; Zeller, Patrick ; Amati, Matteo and Gregoratti, Luca (2019) In ACS Applied Materials and Interfaces 11(32). p.29448-29457
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ambient-pressure XPS, coating, corrosion, operando, spectromicroscopy
in
ACS Applied Materials and Interfaces
volume
11
issue
32
pages
29448 - 29457
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85071352023
  • pmid:31328499
ISSN
1944-8244
DOI
10.1021/acsami.9b08918
language
English
LU publication?
yes
id
73e368bf-55d0-465e-8526-910156c3157c
date added to LUP
2019-10-01 11:23:15
date last changed
2020-03-24 07:04:06
@article{73e368bf-55d0-465e-8526-910156c3157c,
  abstract     = {<p>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.</p>},
  author       = {Scardamaglia, Mattia and Struzzi, Claudia and Zakharov, Alexei and Reckinger, Nicolas and Zeller, Patrick and Amati, Matteo and Gregoratti, Luca},
  issn         = {1944-8244},
  language     = {eng},
  month        = {08},
  number       = {32},
  pages        = {29448--29457},
  publisher    = {The American Chemical Society (ACS)},
  series       = {ACS Applied Materials and Interfaces},
  title        = {Highlighting the Dynamics of Graphene Protection toward the Oxidation of Copper under Operando Conditions},
  url          = {http://dx.doi.org/10.1021/acsami.9b08918},
  doi          = {10.1021/acsami.9b08918},
  volume       = {11},
  year         = {2019},
}