Resolving Atomic-Scale Defects in Conjugated Polymers On-Surfaces
Status PubMed-not-MEDLINE Language English Country Germany Media print-electronic
Document type Journal Article
- Keywords
- atomic force microscopy, conjugated polymers, on-surface synthesis, scanning tunneling microscopy,
- Publication type
- Journal Article MeSH
Atomic scale defects significantly affect the mechanical, electronic, and optical properties of π-conjugated polymers. Here, isolated atomic-scale defects are deliberately introduced into a prototypical anthracene-ethynylene π-conjugated polymer, and its local density of states is carefully examined on the atomic scale to show how individual defects modify the inherent electronic and magnetic properties of this one-dimensional systems. Scanning tunneling and atomic force microscopy experiments, supplemented with density functional theory calculations, reveal the existence of a sharp electronic resonance at the Fermi energy around certain defects, which is associated with the formation of a local magnetic moment accompanied by substantial mitigation of the mobility of charge carriers. While defects in traditionally synthesized polymers lead to arbitrary conformations, the presented results clearly reflect the preferential formation of low dimensional defects at specific polymer sites, which may introduce the possibility of engineering macroscopic defects in surface-synthesized conjugated polymers.
Current address Department of Physics University of Alberta Edmonton Alberta T6G 2J1 Canada
Department of Physical Chemistry Faculty of Science Palacký University 78371 Olomouc Czech Republic
IMDEA Nanociencia Ciudad Universitaria de Cantoblanco Madrid Spain
Institute of Physics Academy of Sciences of the Czech Republic Prague Czech Republic
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