Étude par microscopie à effet tunnel sous ultravide et à basse température de complexes de ruthénium

Loranne Vernisse 1
1 CEMES-GNS - Groupe NanoSciences
CEMES - Centre d'élaboration de matériaux et d'études structurales
Abstract : Using molecules able to execute functions found in microelectronic components is one of the current challenges of nanosciences and molecular electronics. The most suited technique to observe single molecules and predict their behavior is Scanning Tunneling Microscope (STM) in ultra-high vacuum and at low temperature. This thesis is a part of a project dedicated to the synthesis and observation of a molecule composed by four ruthenium cores and able to act as a molecular logic gate. We choose to investigate different molecules which come from the first steps in the synthesis of this compound. They are 3D systems composed by one or two ruthenium cores and were adsorbed on metallic surfaces (as Ag(111), Cu(111) and Au(111)) as well as on ultrathin films of NaCl. Two kinds of molecules were studied: the first ones are composed by ruthenium atoms with an oxidation state of III and the other ones have ruthenium atoms with an oxidation state of II. Specific behaviors of each type of molecules are highlighted, concerning particularly their electronic properties. Manipulations using the STM tip were also performed to explore the adsorption geometries. In the future, these investigations should carry on with the charge state measurement on a metallic atom in an extremely complex molecule. The first results performed on model molecules show that perylene derivative compounds are fully adapted to this type of measurements. Moreover, according to the peripheral group, it is possible to deprotonate the molecule to favor the presence of local charges and create a model system under the STM tip.
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Loranne Vernisse. Étude par microscopie à effet tunnel sous ultravide et à basse température de complexes de ruthénium. Science des matériaux [cond-mat.mtrl-sci]. Université Paul Sabatier - Toulouse III, 2014. Français. ⟨tel-01792739⟩

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