TY - JOUR
T1 - Influence of Graphene on Charge Transfer between CoPc and Metals: The Role of Graphene-Substrate Coupling
AU - Uihlein, Johannes
AU - Polek, Malgorzata
AU - Glaser, Mathias
AU - Adler, Hilmar
AU - Ovsyannikov, Ruslan
AU - Bauer, Maximilian
AU - Ivanovic, Milutin
AU - Preobrajenski, Alexei
AU - Generalov, Alexander
AU - Chasse, Thomas
AU - Peisert, Heiko
PY - 2015
Y1 - 2015
N2 - The electronic structure of cobalt phthalocyanine (CoPc) on Pt(111), graphene/Pt(111), and Au-intercalated graphene/Ni(111) is investigated by photoexcited electron spectroscopies: photoemission (XPS and UPS) and X-ray absorption spectroscopy (XAS or NEXAFS). For CoPc on Pt(111), significant changes of the shape of XPS and XAS spectra indicate a charge transfer from the metal substrate to the Co ion of CoPc. The strong interaction between CoPc and Pt(111) can be completely prevented by the insertion of a graphene buffer layer. For CoPc on graphene/Ni(111), the charge transfer is only prevented if the graphene on Ni(111) is intercalated by gold. Therefore, the disturbance of the graphene electronic structure by the interaction with underlying substrate and the corresponding charge doping of graphene has been found to affect the electronic properties of adsorbed CoPc considerably.
AB - The electronic structure of cobalt phthalocyanine (CoPc) on Pt(111), graphene/Pt(111), and Au-intercalated graphene/Ni(111) is investigated by photoexcited electron spectroscopies: photoemission (XPS and UPS) and X-ray absorption spectroscopy (XAS or NEXAFS). For CoPc on Pt(111), significant changes of the shape of XPS and XAS spectra indicate a charge transfer from the metal substrate to the Co ion of CoPc. The strong interaction between CoPc and Pt(111) can be completely prevented by the insertion of a graphene buffer layer. For CoPc on graphene/Ni(111), the charge transfer is only prevented if the graphene on Ni(111) is intercalated by gold. Therefore, the disturbance of the graphene electronic structure by the interaction with underlying substrate and the corresponding charge doping of graphene has been found to affect the electronic properties of adsorbed CoPc considerably.
U2 - 10.1021/acs.jpcc.5b02912
DO - 10.1021/acs.jpcc.5b02912
M3 - Article
SN - 1932-7447
VL - 119
SP - 15240
EP - 15247
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 27
ER -