Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 48, Pages 33112-33120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12175
Keywords
vanadium dioxide; 2D nanostructure; photonic crystal; FDTD; color change; thermochromic
Funding
- Singapore Research Foundation under the Campus for Research and Technological Enterprise (CREATE): NTU-HUJ-BGU Nanomaterials for Engineering and Water Management
- Singapore Minster of Education (MOE) Academic Research Fund [RG101/13]
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Two-dimensional (2D) photonic structures, widely used for generating photonic band gaps (PBG) in a variety of materials, are for the first time integrated with the temperature-dependent phase change of vanadium dioxide (VO2). VO2 possesses thermochromic properties, whose potential remains unrealized due to an undesirable yellow-brown color. Here, a SiO2/VO2 core/shell 2D photonic crystal is demonstrated to exhibit static visible light tunability and dynamic near-infrared (NIR) modulation. Three-dimensional (3D) finite difference time domain (FDTD) simulations predict that the transmittance can be tuned across the visible spectrum, while maintaining good solar regulation efficiency (Delta T-sol = 11.0%) and high solar transmittance (T-lum = 49.6%). Experiments show that the color changes of VO2 films are accompanied by NIR. modulation. This work presents a novel way to manipulate VO2 photonic structures to modulate light transmission as a function of wavelength at different temperatures.
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