Block copolymer structural color strain sensor

Tae Hyun Park, Seunggun Yu, Sung Hwan Cho, Han Sol Kang, Yeongsik Kim, Min Ju Kim, Hongkyu Eoh, Chanho Park, Beomjin Jeong, Seung Won Lee, Du Yeol Ryu, June Huh, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


The development of electrically responsive sensors based on the capacitance, voltage, and resistance that can detect and simultaneou sly visualize the large strain involved with human motion is in great demand. Here, we demonstrate a highly stretchable, large strain capacitive sensor that can visualize strain based on the strain-responsive structural color (SC). Our device contains an elastomeric sensing film that produces a capacitance change under strain, in which a self-assembled block copolymer (BCP) photonic crystal (PC) film with 1D periodic in-plane lamellae aligned parallel to the film surface is embedded for the efficient visualization of strain. The capacitance change arises from changes in the dimensions of the elastomer film under strain. The mechanochromic BCP PC film responds to strain, giving rise to an SC change with strain. The initial red SC of the sensor blueshifts and turns blue when the sensor is stretched to 100%, resulting in a full-color SC alteration as a function of the strain. Our BCP SC strain sensor exhibits a fast strain response with multi-cycle reliability of both the capacitance and SC changes over 1000 cycles. This property allows for efficient visible recognition not only of the strained positions during finger bending and poking with a sharp object but also of the shapes of the strained objects.

Original languageEnglish
Pages (from-to)328-339
Number of pages12
JournalNPG Asia Materials
Issue number4
Publication statusPublished - 2018 Apr 1

Bibliographical note

Funding Information:
This research was supported by the Samsung Research Funding Center of Samsung Electronics under project number SRFC-MA1301-03.

Publisher Copyright:
© The Author(s) 2018.

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics


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