Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.45: Poster

Tuesday, March 17, 2015, 18:15–21:00, Poster B

Ordering and Electronic Properties of Porphine on Graphene/Ag(111) — •Jacob Ducke, Yuanqin He, Felix Bischoff, Manuela Garnica, Johannes Barth, and Willi Auwärter — Physik Department E20, Technische Universität München, James Franck Straße 1, 85748 Garching, Germany

Bonding and organization of functional molecules at interfaces is strongly affected by the interaction with the support. By switching from metal surfaces to sp2-bonded monolayer templates an electrical decoupling of the molecules from their support is possible that recently attracted significant interest [1,2]. This decoupling provides new possibilities to order and structure components at the nanometer scale. Here we focus on the interactions and the electronic modification of free-base porphine (2H-P), a prototype tetrapyrrole compound, on graphene/Ag(111). In STS measurements pronounced peaks corresponding to LUMO and HOMO orbitals appear. Furthermore, the repulsions between 2H-P previously identified on Ag(111) are diminished [3]. Our findings are put into perspective with results for electronically decoupled 2H-P on BN/Cu(111) and 2H-P on bare Ag(111). All measurements were conducted with a low temperature STM. [1] Joshi, Sushobhan, et al. Nano letters 12.11 (2012): 5821-5828. [2] Jaervinen, Paeivi, et al. Nano letters 13.7 (2013): 3199-3204. [3] Joshi, Sushobhan, et al. ACS Nano 8 (2014) 430