Sequential assembly of metal-free phthalocyanine on few-layer epitaxial graphene mediated by thickness-dependent surface potential |
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| Authors: | Yabo Gao Yanfeng Zhang Jun Ren Denghua Li Teng Gao Ruiqi Zhao Yanlian Yang Sheng Meng Chen Wang Zhongfan Liu |
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| Affiliation: | 1.Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies,Peking University,Beijing,China;2.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences,Beijing,China;3.National Center for Nanoscience and Technology,Beijing,China |
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| Abstract: | Due to strong interactions between epitaxial graphene and SiC(0001) substrates, the overlayer charge density induced by the
interface charging effect is much more attenuated than that of exfoliated graphene on SiO2. We report herein a quantitive detection of the charge properties of few-layer graphene by surface potential measurements
using electrostatic force microscopy (EFM). A minor difference in surface potential is observed to mediate a sequential assembly
of metal-free phthalocyanine (H2Pc) on monolayer, bilayer and trilayer graphenes, as demonstrated by scanning tunneling microscopy (STM). In order to understand
this, we further executed density functional theory (DFT) calculations which showed higher adsorption energies for Pc on thinner
graphenes. In this case, we attribute the unique growth behavior of Pc to its variable adsorption energies on few-layer graphene,
and in turn the layer charge variations from the viewpoint of energy minimizations. This work is expected to provide fundamental
data useful for related nanodevice fabrications.
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