Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures V

O 87.3: Vortrag

Donnerstag, 15. März 2018, 11:15–11:30, MA 004

Electrospray deposition of structurally complex molecules revealed by atomic force microscopy — •Antoine Hinaut¹, Tobias Meier¹, Remy Pawlak¹, Sara Freund¹, Klaus Müllen², Silvio Decurtins³, Thilo Glatzel¹, Akimitsu Narita², Shi-Xia Liu³, and Ernst Meyer¹ — ¹Dep. of Physics, Univ. of Basel, Switzerland. — ²MPI for Polymer Research, Mainz, Germany — ³Dep. of Chemistry and Biochemistry, Univ. of Bern, Switzerland

Increasing complexity and functionalization of molecular species studied in ultra high vacuum is actually mainly limited by the deposition technique. We used our electrospray deposition setup[1,2], to introduce two molecular species in ultra high vacuum. The first molecule, based on large aromatic core, includes six long alkyl chains. Assemblies on the Au(111) surface both at room temperature with ncAFM and at low temperature with AFM/STM are observed. Their formation is directed by alkyl-alkyl interaction and is also influenced by the measurement temperature. The second species is a fused electron donor-acceptor molecule. Measurement on the Au(111) surface at low temperature AFM/STM shows small island formation directed by H-bond interaction. In both cases we reach cleanliness levels compatible with high-resolution CO functionalized tip AFM measurements and show the intact chemical structures after electrospray deposition. Therefore our setup combined with high resolution scanning probe measurements allows investigation of more complex compounds with attractive properties. [1] Hinaut et al., BJNano, 2015, 6, 1927-1934. [2] Hinaut et al., submitted to Nanoscale.