Article Dans Une Revue 2D Materials Année : 2019

Experimental molecular adsorption: electronic buffer effect of germanene on Al(1 1 1)

Résumé

The interaction of organic C 60 molecules with germanene grown on Al(1 1 1) is investigated by experimental tools and calculations. By mean of scanning tunneling microscopy, we show that a single but disordered C 60 layer is formed upon deposition in the monolayer range. Density functional theory calculations indicate that van der Waals and electrostatic interactions are present between the C 60 layer and the germanene, without formation of covalent bond. Moreover, the C 60 molecules are adsorbed without major crystallographic and charge modifications at the interface between germanene and the Al(1 1 1) substrate. The predicted charge transfer from the Al(1 1 1) substrate to the C 60 molecules is very small, which means that the germanene layer acts as an electronic buffer between the highly electron attractor C 60 molecules and the large electron reservoir Al(1 1 1). This leaves the C 60 layer quite uncharged, and so preserves its electron attractor properties for further layers grown on it, in the design of new molecular sensors.

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Dates et versions

hal-03151696 , version 1 (24-02-2021)

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Natalia Massara, Adil Marjaoui, Regis Stephan, Marie-Christine Hanf, Mickael Derivaz, et al.. Experimental molecular adsorption: electronic buffer effect of germanene on Al(1 1 1). 2D Materials, 2019, 6 (3), pp.035016. ⟨10.1088/2053-1583/ab1601⟩. ⟨hal-03151696⟩
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