Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001)

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • T. T. Nhung Nguyen
  • Johannes Aprojanz
  • Monika Jäger
  • T. N. Ha Nguyen
  • Christoph Tegenkamp

Organisationseinheiten

Externe Organisationen

  • Technische Universität Chemnitz
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Details

OriginalspracheEnglisch
Seiten (von - bis)45-51
Seitenumfang7
FachzeitschriftSurface Science
Jahrgang686
Frühes Online-Datum17 Apr. 2019
PublikationsstatusVeröffentlicht - 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.

ASJC Scopus Sachgebiete

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Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001). / Nhung Nguyen, T. T.; Aprojanz, Johannes; Jäger, Monika et al.
in: Surface Science, Jahrgang 686, 08.2019, S. 45-51.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Nhung Nguyen, TT, Aprojanz, J, Jäger, M, Ha Nguyen, TN & Tegenkamp, C 2019, 'Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001)', Surface Science, Jg. 686, S. 45-51. https://doi.org/10.1016/j.susc.2019.04.003
Nhung Nguyen, T. T., Aprojanz, J., Jäger, M., Ha Nguyen, T. N., & Tegenkamp, C. (2019). Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001). Surface Science, 686, 45-51. https://doi.org/10.1016/j.susc.2019.04.003
Nhung Nguyen TT, Aprojanz J, Jäger M, Ha Nguyen TN, Tegenkamp C. Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001). Surface Science. 2019 Aug;686:45-51. Epub 2019 Apr 17. doi: 10.1016/j.susc.2019.04.003
Nhung Nguyen, T. T. ; Aprojanz, Johannes ; Jäger, Monika et al. / Noninvasive coupling of PbPc monolayers to epitaxial graphene on SiC(0001). in: Surface Science. 2019 ; Jahrgang 686. S. 45-51.
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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.",
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note = "Funding information: We thank Davood Momeni Pakdehi ( PTB Braunschweig) and Thomas Seyller (TU Chemnitz) for providing us epitaxially grown graphene samples on SiC(0001).",
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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).

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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.

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KW - PbPc adsorption

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