Berlin 2024 – wissenschaftliches Programm
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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