Micrometre-long covalent organic fibres by photoinitiated chain-growth radical polymerization on an alkali-halide surface

Watkins, Matthew (2018) Micrometre-long covalent organic fibres by photoinitiated chain-growth radical polymerization on an alkali-halide surface. Nature Chemistry . ISSN 1755-4330

Full content URL: https://www.nature.com/articles/s41557-018-0120-x

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Micrometre-long covalent organic fibres by photoinitiated chain-growth radical polymerization on an alkali-halide surface
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Abstract

On-surface polymerization is a promising technique to prepare organic functional nanomaterials that are challenging to synthesize in solution, but it is typically used on metal substrates, which play a catalytic role. Previous examples on insulating surfaces have involved intermediate self-assembled structures, which face high barriers to diffusion, or annealing to higher temperatures, which generally causes rapid dewetting and desorption of the monomers. Here we report the photoinitiated radical polymerization, initiated from a two-dimensional gas phase, of a dimaleimide monomer on an insulating KCl surface. Polymer fibres up to 1 μm long are formed through chain-like rather than step-like growth. Interactions between potassium cations and the dimaleimide’s oxygen atoms facilitate the propagation of the polymer fibres along a preferred axis of the substrate over long distances. Density functional theory calculations, non-contact atomic force microscopy imaging and manipulations at room temperature were used to explore the initiation and propagation processes, as well as the structure and stability of the resulting one-dimensional polymer fibres.

Additional Information:related URL is the supporting info for paper
Keywords:Nanowire, Nanoscience, Scanning Probe Microscope, Density Functional Theory, Chemical Physics
Subjects:F Physical Sciences > F162 Polymer Chemistry
F Physical Sciences > F320 Chemical Physics
F Physical Sciences > F100 Chemistry
F Physical Sciences > F321 Solid state Physics
F Physical Sciences > F200 Materials Science
F Physical Sciences > F342 Quantum Mechanics
Divisions:College of Science > School of Mathematics and Physics
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ID Code:33046
Deposited On:30 Aug 2018 07:56

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