Journal
ACS NANO
Volume 7, Issue 7, Pages 5769-5776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400358x
Keywords
smart windows; vanadium dioxide; graphene; flexible thermochromic window; roll transfer
Categories
Funding
- Technology Innovation Program [10044410]
- Ministry of Trade, Industry and Energy, Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20127100201723]
- Korea government Ministry of Knowledge Economy, Priority Research Centers Program [GT-SWS-11-01-004-0]
- Korea Ministry of Environment, the Global Frontier Research Program through the National Research Foundation (NRF) from the Center for Advanced Soft Electronics [2011-0031630]
- Ministry of Education, Science and Technology (MEST) of Korea
- Priority Research Centers Program through the NRF [2010-0020207]
- Ministry of Education, Basic Science Program
- Nano Material Technology Development Program through the NRF
- Ministry of Science, ICT and Future Planning [2012M3A7B4049888]
- TJ Park Science Fellowship of POSCO TJ Park Foundation
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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 VO2. 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 thermochromk 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.
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