Photomechanical organosiloxane films derived from azobenzene-modified di- and tri-alkoxysilanes

Takehiro Harigaya, Ryota Kajiya, Hiroaki Wada, Kazuyuki Kuroda, Atsushi Shimojima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Photoresponsive materials that reversibly change their shape upon light irradiation have a wide range of applications, such as sensors and actuators. Previously, we reported a free-standing film of a lamellar azobenzene–siloxane hybrid exhibiting reversible bending triggered by trans–cis photoisomerization of azobenzene. This material was prepared by an evaporation-induced self-assembly process using azobenzene-modified trialkoxysilanes as precursors. In this study, azobenzene-modified diethoxymethylsilane (AzoDES) was used in combination with conventional azobenzene-modified triethoxysilanes as the precursors to investigate the molecular factors affecting the structures and photoinduced bending behaviors of the lamellar azobenzene–siloxane hybrid materials. A lamellar hybrid film showing a higher degree of bending upon UV irradiation was obtained by adjusting the AzoDES content in the alkoxysilane precursors, although a further increase of the AzoDES content resulted in a disordered structure and lower degree of bending. The enhanced photo-deformation was attributed to the decrease in the degree of cross-linking of the siloxane networks.

Original languageEnglish
Pages (from-to)659-665
Number of pages7
JournalJournal of Sol-Gel Science and Technology
Issue number3
Publication statusPublished - 2022 Dec


  • Azobenzene
  • Inorganic–organic hybrids
  • Photomechanical materials
  • Self-assembly

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry


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