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Resolving Atomic-Scale Defects in Conjugated Polymers On-Surfaces.

Benjamín Mallada^1,2,3, Qifan Chen³, Taras Chutora^1,4

¹Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 78371, Olomouc, Czech Republic.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|June 10, 2022

Summary

This summary is machine-generated.

Introducing atomic defects into π-conjugated polymers creates localized electronic states and magnetic moments. This defect engineering offers new possibilities for controlling polymer properties in one-dimensional systems.

Keywords:

atomic force microscopy conjugated polymers on-surface synthesis scanning tunneling microscopy

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Area of Science:

Materials Science
Condensed Matter Physics
Polymer Chemistry

Background:

Atomic-scale defects critically influence the properties of π-conjugated polymers.
Understanding these defects is key to tailoring polymer performance.

Purpose of the Study:

To investigate how individual atomic-scale defects impact the electronic and magnetic properties of a model π-conjugated polymer.
To explore defect-induced modifications in one-dimensional systems.

Main Methods:

Deliberate introduction of atomic-scale defects into anthracene-ethynylene polymers.
Atomic-scale examination of local density of states using scanning tunneling and atomic force microscopy.
Complementary density functional theory calculations.

Main Results:

Observation of a sharp electronic resonance at the Fermi energy around specific defects.
Formation of local magnetic moments linked to these electronic resonances.
Significant reduction in charge carrier mobility near defects.
Preferential formation of low-dimensional defects at specific polymer sites.

Conclusions:

Individual atomic defects can create localized electronic states and magnetic moments in π-conjugated polymers.
Defect engineering provides a pathway to control charge carrier mobility and magnetic properties.
Surface synthesis allows for controlled defect formation, enabling potential macroscopic defect engineering.