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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Unraveling Chemical Interactions between Titanium and Graphene for Electrical Contact Applications

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Title
Unraveling Chemical Interactions between Titanium and Graphene for Electrical Contact Applications
Author
Freedy, Keren M.Beechem, Thomas E.Litwin, Peter M.Sales, Maria GabrielaHuang, MingRuoff, Rodney S.McDonnell, Stephen J.
Issue Date
2018-09
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED NANO MATERIALS, v.1, no.9, pp.4828 - 4835
Abstract
The chemical interaction between Ti and graphene is of significant interest for engineering low-resistance electrical contacts. To study the interface chemistry, sequential depositions of Ti are performed on both as-received and ultrahigh-vacuum (UHV)-annealed chemical-vapor-deposition-grown graphene samples. In situ X-ray photoelectron spectroscopy (XPS) reveals no experimental evidence for the reaction of Ti with graphene at room temperature or after heating to 500 °C. The presence of the TiC chemical state is instead attributed to reactions between Ti and background gases in the UHV chamber as well as adventitious C on the surface of the graphene sample. We find that surface contamination can be substantially reduced by annealing in UHV. The deposition of Ti on graphene results in n-type doping, which manifests in core-level shifts and broadening of the graphene C 1s peak. Annealing the sample following the deposition of Ti reverses the n-type doping. The Raman spectroscopy results are in agreement with XPS analysis, which together provide insight into the possible mechanisms driving the changes in graphene doping.
URI
https://scholarworks.unist.ac.kr/handle/201301/25667
URL
https://pubs.acs.org/doi/10.1021/acsanm.8b01024
DOI
10.1021/acsanm.8b01024
ISSN
2574-0970
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