Flexible thermochromic window based on hybridized VO2/graphene

Hyeongkeun Kim, Yena Kim, Keun Soo Kim, Hu Young Jeong, A. Rang Jang, Seung Ho Han, Dae Ho Yoon, Kwang S. Suh, Hyeon Suk Shin, Taeyoung Kim, Woo Seok Yang

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)


Large-scale integration of vanadium dioxide (VO2) on mechanically flexible substrates is critical to the realization of flexible smart window films that can respond to environmental temperatures to modulate light transmittance. Until now, the formation of highly crystalline and stoichiometric VO2 on flexible substrate has not been demonstrated due to the high-temperature condition for VO2 growth. Here, we demonstrate a VO2-based thermochromic film with unprecedented mechanical flexibility by employing graphene as a versatile platform for VO 2. The graphene effectively functions as an atomically thin, flexible, yet robust support which enables the formation of stoichiometric VO2 crystals with temperature-driven phase transition characteristics. The graphene-supported VO2 was capable of being transferred to a plastic substrate, forming a new type of flexible thermochromic film. The flexible VO2 films were then integrated into the mock-up house, exhibiting its efficient operation to reduce the in-house temperature under infrared irradiation. These results provide important progress for the fabrication of flexible thermochromic films for energy-saving windows.

Original languageEnglish
Pages (from-to)5769-5776
Number of pages8
JournalACS nano
Issue number7
Publication statusPublished - 2013 Jul 23


  • flexible thermochromic window
  • graphene
  • roll transfer
  • smart windows
  • vanadium dioxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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