Colloidal Photonic Crystal Strain Sensor Integrated with Deformable Graphene Phototransducer

Peter Snapp, Pilgyu Kang, Juyoung Leem, Sung Woo Nam

Research output: Contribution to journalArticlepeer-review


Flexible, architectured, photonic nanostructures such as colloidal photonic crystals (CPCs) can serve as colorimetric strain sensors, where external applied strain leads to a noticeable color change. However, CPCs' response to strain is difficult to quantify without the use of optical spectroscopy. Integration of flexible electrical readout of CPCs' color change is a challenge due to a lack of flexible/stretchable electrical transducers. This work details a colorimetric strain sensor with optoelectrical quantification based on an integrated system of CPCs over a crumpled graphene phototransducer, which optoelectrically quantifies CPCs, response to strain. The hybrid system enables direct visual perception of strain, while strain quantification via electrical measurement of the hybrid system outperforms that of crumpled graphene strain sensors by more than 100 times. The unique combination of a photonic sensing element with a deformable transducer will allow for the development of novel, electrically quantifiable colorimetric sensors with high sensitivity.

Original languageEnglish (US)
Article number1902216
JournalAdvanced Functional Materials
Issue number33
StatePublished - Aug 2019


  • colloidal photonic crystals
  • colorimetric
  • crumpling
  • graphene
  • strain

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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