Room temperature electronic template effect of pre-structured SmSi(111)-8x2 interface yielding self-aligned organic molecules

Youness Makoudi (1) , Eric Duverger (1) , Madjid Arab (1) , Frédéric Chérioux (1) , Francisco Ample (2) , Gwénaël Rapenne (2) , Xavier Bouju (2) , Frank Palmino (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
2 CEMES - Centre d'élaboration de matériaux et d'études structurales

This work describes an innovative concept for the development of organized molecular systems thanks to the template effect of the pre-structured semi-conductive SmSi(111) interface. This substrate was selected because Sm deposition in the submonolayer range leads to a 8x2-reconstruction, which is a well-defined one-dimensional semi-metallic structure. Adsorption of aromatic molecules (1,4-di-(9-ethynyltriptycenyl)-benzene) on SmSi(111)-8x2 and Si(111)-7x7 interfaces has been investigated by scanning tunneling microscopy (STM) at room temperature. Density functional theory (DFT) and semi-empirical (ASED+) calculations have been performed to define the nature of the molecular adsorption sites of the target molecule on SmSi as well as their self-alignment on this interface. Experimental data and theoretical results are in good agreement.

Domaines: Autre [cond-mat.other]

Youness Makoudi, Eric Duverger, Madjid Arab, Frédéric Chérioux, Francisco Ample, et al.. Room temperature electronic template effect of pre-structured SmSi(111)-8x2 interface yielding self-aligned organic molecules. ChemPhysChem, 2008, 9 (10), pp.1437-1441. ⟨10.1002/cphc.200800123⟩. ⟨hal-00281318⟩