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Soutenance de thèse de Mali ZHAO (13 janvier 2017)
par - 15 décembre 2016
Electronic Properties of Graphene Functionalized with 2D Molecular Assemblies
Graphene has extraordinary electronic properties because of its zero band gap and linear band structure. However, the lack of a band gap hinders the implementation of graphene in electronic devices. Tuning the graphene band gap by organic molecular building blocks is one of the promising ways to obtain a precise control of the graphene charge carriers.
In this thesis, graphene was prepared by sublimating Si atoms from SiC substrate. Three organic molecules which carry different spin information, Ni-phthalocyanine (NiPc), Pt-tetraphenylporphyrin (PtTPP(CO2Me)4) and Fe-tetraphenylporphyrin (Fe(TPP)Cl) were used to functionalize graphene. The self-assembly and electronic properties of organic molecules on graphene were studied by Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT) calculation.
All three molecules form well-ordered square lattice molecular networks on graphene via the van der Waals force, which give rise to the capacitive molecule/ graphene interfaces. The electronic coupling between FeTPP molecules and graphene is stronger than that between NiPc or PtTPP molecules and graphene. This study would shed a dim light on the application of organometallic molecules/graphene interface in spintronic devices.
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Soutenance de thèse de Mali ZHAO - 263.5 kio 13 janvier 2017 |