Light-Driven Surface Patterning of Supramolecular Polymers with Extremely Low Concentration of Photoactive Molecules

Jenni E. Koskela, Jaana Vapaavuori, Robin H. A. Ras*, Arri Priimagi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

Light-induced surface patterning in azobenzene-containing polymers and other materials is a widely studied phenomenon with possible applications in fields ranging from photonics to biology. Yet, the fundamental understanding of this purely photbdriven mass transport remains inadequate, and existing literature fails to define a threshold chromophore content for mass transport to occur, if such a limit exists. This letter presents a systematic study of the relationship between chromophore, concentration and mass transport using hydrogen-bonded polymer azobenzene complexes, in which the chromophore concentration can be freely adjusted while keeping the polymer backbone unchanged. Essentially, we demonstrate that effective surface patterning can be induced even at an extremely low chromophore content of 1 mol %, when only every tenth polymer chain carries a single azobenzene molecular motor. Importantly, the results highlight the extraordinary photomechanical power of azobenzene and contribute to the fundamental understanding of the light-induced motions.

Original languageEnglish
Pages (from-to)1196-1200
Number of pages5
JournalACS Macro Letters
Volume3
Issue number11
DOIs
Publication statusPublished - Nov 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • LIQUID-CRYSTALLINE POLYMER
  • SELF-ASSEMBLED MONOLAYERS
  • RELIEF GRATING FORMATION
  • AZOBENZENE COMPLEXES
  • MASS-TRANSPORT
  • AZO-POLYMERS
  • FILMS
  • PHOTOFLUIDIZATION
  • MOTION
  • BIREFRINGENCE

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