Tunable stimuli-responsive color-change properties of layered organic composites

Machi Takeuchi, Karthikeyan Gnanasekaran, Heiner Friedrich, Hiroaki Imai, Nico A.J.M. Sommerdijk, Yuya Oaki

Research output: Contribution to journalArticleAcademicpeer-review

49 Citations (Scopus)


Stimuli-responsive properties of soft materials originate from dynamic structure changes. Layered polydiacetylene (PDA) shows color-change properties with the application of external stimuli, such as thermal and mechanical stresses. Layered organic materials possessing intercalation capabilities and dynamic properties have potentials for tuning their structures and properties by the intercalated guests. A variety of sensing and imaging devices can be developed by control of the stimuli responsivity. Here, the key structures, processes, and mechanisms for tuning the stimuli-responsive color-change properties of layered PDA are studied by in situ analyses with heating and cooling. The in situ analyses indicate that heating initiates thermal motion of the alkyl side chains of the PDA main chain in the host layers around 60 °C, regardless of the type of intercalated guests. Further heating induces torsion of the PDA main chain leading to color changes at different temperatures, depending on the types of the intercalated guest. Then, the layered structure is irreversibly deformed with lowering the crystallinity. The results indicate that the stimuli-responsive color-change properties are controlled by the rigidity of the layered structures consisting of the host layers and guests. The control strategy based on rigidity tuning can be applied to a variety of soft materials with stimuli responsivity.

Original languageEnglish
Article number1804906
Number of pages11
JournalAdvanced Functional Materials
Issue number45
Early online date19 Sept 2018
Publication statusPublished - 7 Nov 2018


  • in situ analyses
  • intercalation
  • layered materials
  • organic–inorganic composites
  • stimuli-responsive materials


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