Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.15: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B1
Nanostructure formation of hexphenylnitril — •Jörg Meyer1, Anja Nickel1, Robin Ohmann1, Cormac Toher1, Francesca Moresco1, and Gianaurelio Cuniberti1,2 — 1Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01062 Dresden, Germany — 2Division of IT Convergence Engineering, POSTECH, Pohang 790- 784, Republic Korea
We report the first STM and STS measurements of the asymmetric molecule hexphenylnitril on the Au(111) surface. This molecule consists of six phenyl rings connected via single bonds in the para position (forming a straight line). One side of the molecule is functionalized with a cyano group. At high surface coverages, the molecules exhibit a densely packed parallel structure. At lower surface coverage the molecules tend to adsorb on step edges and adatoms due to their high mobility on the Au(111) surface. Triplets of molecules have also been observed. This triplet structure also verifies the intended asymmetrical structure of the molecule, because bifunctionalized specimens are known to form extended networks with similar triplet structures. To clarify whether the molecules themselves form a self-stabilising nanostructure or just attach to an adatom, we varied the sample temperature during evaporation. With increasing substrate temperature the fraction of triplets among all adsorbates increased. Comparing this to the known increase in the density of adatoms on the Au(111) surface leads to the interpretation of three molecules gathering around single adatoms.