Details
| Original language | English |
|---|---|
| Pages (from-to) | 45-51 |
| Number of pages | 7 |
| Journal | Surface Science |
| Volume | 686 |
| Early online date | 17 Apr 2019 |
| Publication status | Published - Aug 2019 |
Abstract
Proximity coupling is discussed as a promising approach to tune further graphene's properties. Organic π-conjugated molecules couple per se weakly to surfaces and the class of phthalocyanines provides manifold possibilities for molecular functionalization. We have investigated the adsorption of lead phthalocyanine (PbPc) on epitaxial graphene by means of scanning tunneling microscopy and in-situ electronic transport measurements in order to quantify both a molecular charge transfer and modifications of the carrier mobility in graphene. Compared to other metallic surfaces, monolayer structures of PbPc adsorbed on graphene solely pointing upwards, apparently, due to the antibonding character of the Pb-states with the pz-orbitals of graphene. The squared lattice of the molecular layer is not commensurate with the honeycomb lattice of graphene and the PbPc molecules are slightly tilted, thus forming a chiral monolayer structure. Despite this interaction with graphene, the charge state of the molecule as well as the mobility of the charge carriers in graphene are not altered. Therefore, monolayer structures of Pb molecules are promising candidates for proximity studies in graphene.
Keywords
- Graphene, PbPc adsorption, Proximity, STM, Transport
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface Science, Vol. 686, 08.2019, p. 45-51.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001)
AU - Nhung Nguyen, T. T.
AU - Aprojanz, Johannes
AU - Jäger, Monika
AU - Ha Nguyen, T. N.
AU - Tegenkamp, Christoph
N1 - Funding information: We thank Davood Momeni Pakdehi ( PTB Braunschweig) and Thomas Seyller (TU Chemnitz) for providing us epitaxially grown graphene samples on SiC(0001).
PY - 2019/8
Y1 - 2019/8
N2 - Proximity coupling is discussed as a promising approach to tune further graphene's properties. Organic π-conjugated molecules couple per se weakly to surfaces and the class of phthalocyanines provides manifold possibilities for molecular functionalization. We have investigated the adsorption of lead phthalocyanine (PbPc) on epitaxial graphene by means of scanning tunneling microscopy and in-situ electronic transport measurements in order to quantify both a molecular charge transfer and modifications of the carrier mobility in graphene. Compared to other metallic surfaces, monolayer structures of PbPc adsorbed on graphene solely pointing upwards, apparently, due to the antibonding character of the Pb-states with the pz-orbitals of graphene. The squared lattice of the molecular layer is not commensurate with the honeycomb lattice of graphene and the PbPc molecules are slightly tilted, thus forming a chiral monolayer structure. Despite this interaction with graphene, the charge state of the molecule as well as the mobility of the charge carriers in graphene are not altered. Therefore, monolayer structures of Pb molecules are promising candidates for proximity studies in graphene.
AB - Proximity coupling is discussed as a promising approach to tune further graphene's properties. Organic π-conjugated molecules couple per se weakly to surfaces and the class of phthalocyanines provides manifold possibilities for molecular functionalization. We have investigated the adsorption of lead phthalocyanine (PbPc) on epitaxial graphene by means of scanning tunneling microscopy and in-situ electronic transport measurements in order to quantify both a molecular charge transfer and modifications of the carrier mobility in graphene. Compared to other metallic surfaces, monolayer structures of PbPc adsorbed on graphene solely pointing upwards, apparently, due to the antibonding character of the Pb-states with the pz-orbitals of graphene. The squared lattice of the molecular layer is not commensurate with the honeycomb lattice of graphene and the PbPc molecules are slightly tilted, thus forming a chiral monolayer structure. Despite this interaction with graphene, the charge state of the molecule as well as the mobility of the charge carriers in graphene are not altered. Therefore, monolayer structures of Pb molecules are promising candidates for proximity studies in graphene.
KW - Graphene
KW - PbPc adsorption
KW - Proximity
KW - STM
KW - Transport
UR - http://www.scopus.com/inward/record.url?scp=85064535626&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2019.04.003
DO - 10.1016/j.susc.2019.04.003
M3 - Article
AN - SCOPUS:85064535626
VL - 686
SP - 45
EP - 51
JO - Surface Science
JF - Surface Science
SN - 0039-6028
ER -