Abstract
Room temperature scanning tunneling microscopy (STM) has been carried out on two newly synthesized organic molecules, octabutylgerma-4-pericycline C40H72Ge4 and dodecaphenylgerma-6-pericycline C84H60Ge6, at atmospheric pressure condition. A regular array of cluster-like patterns and square patterns are observed for C40H72Ge4 molecules. Straight lines structures of regular periodicity of about 5.5 nm are noticed for C84H60Ge6 molecule. Some molecular islands are also observed for both molecules by STM. Therefore the molecules tend to self-assemble on the graphite surface. Spectra obtained from X-ray Photoelectron Spectroscopy (XPS) and X-ray Fluorescence Spectroscopy (XFS) support the molecular assembly on the substrate surface even in an ultra high vacuum condition.
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