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O: Fachverband Oberflächenphysik

O 51: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation II

O 51.8: Vortrag

Mittwoch, 20. März 2024, 17:00–17:15, HE 101

How conductive is a single polyene chain? — •Sifan You¹, Yixuan Gao², Shixuan Du², and Lifeng Chi¹ — ¹Soochow University, Suzhou, China. — ²Institute of Physics, Beijing, China

Conjugated polymers are promising candidates for molecular wires in nanoelectronics, with flexibility in mechanics, stability in chemistry and variety in electrical conductivity. Polyene, as a segment of polyacetylene, is a typical conjugated polymer with straightforward structure and wide-range adjustable conductance. To obtain atomic scale understanding of charge transfer in polyene, we measured the conductance of a single polyene-based molecular chain via lifting it up with scanning tunneling microscopy tip. Different from semiconducting characters in pristine polyene (polyacetylene), high conductance and low decay constant were obtained, along with an electronic state around Fermi level and characteristic vibrational mode.

Keywords: conjugated polymer; single-molecule conductance; polyene; tip manipulation