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 87.6: Vortrag

Donnerstag, 15. März 2018, 12:00–12:15, MA 004

Electrospray deposition of a Spoked Wheel molecule on bulk insulator surfaces in UHV — •Sebastian Scherb1, Antoine Hinaut1, Akimitsu Narita2, Klaus Müllen2, Sara Freund1, Zhao Liu1, Thilo Glatzel1, and Ernst Meyer11Department of Physics, University of Basel, Basel, Switzerland — 2Max Planck Institute for Polymer Research, Mainz, Germany

Deposition of large, structurally complex molecules in UHV provides interesting prospects for applications in optoelectronics and molecular electronics. With increasing size, complexity or chemical reactivity deposition by thermal evaporation becomes challenging. A possible way to deposit such molecules in clean conditions is electrospray deposition. Since for the study of electronic properties of molecules decoupling from the surface is mandatory, deposition on insulator surfaces is necessary. In previous studies [1] triply fused porphyrin molecules were deposited on the KBr(001) surface, proving the capabilities of electro spray deposition for depositing organic molecules on bulk insulator.

Here, we report the deposition of a shape persistent polyphenylene Spoked Wheel molecule [2] onto KBr(001) using electrospray deposition in UHV. We show island growth on Au(111) and KBr(001) surfaces by ncAFM study in UHV at room temperature. We are further able to provide molecular resolution of islands, observing straight interdigitation of alkyl chains on the Au(111) surface and a tilting of the interdigitating alkyl chains on the KBr(001) surface.

[1] Hinaut, A. et al., Beilstein J. Nanotechnol. 6, 1927-1934 (2015). [2] Liu, Y. et al., J. Am. Chem. Soc. 138, 15539-15542 (2016).

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