Effects of layer numbers on thermochromic vanadium dioxide coatings
Vanadium (IV) oxide or vanadium dioxide (VO2) is the most extensively studied thermochromic material for energy conservation. It changes from transmissive to reflective in the near-infrared (NIR) transmission upon a metal-to-insulator (MIT) phase transition at critical temperature (Tc) of 68°C. H...
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| Format: | Final Year Project |
| Language: | English |
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Nanyang Technological University
2021
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| Online Access: | https://hdl.handle.net/10356/148238 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Vanadium (IV) oxide or vanadium dioxide (VO2) is the most extensively studied
thermochromic material for energy conservation. It changes from transmissive to
reflective in the near-infrared (NIR) transmission upon a metal-to-insulator (MIT)
phase transition at critical temperature (Tc) of 68°C. However, due to the intrinsic
physical properties of VO2, the trade-off between enhancing luminous transmittance
(Tlum) and solar modulation ability (ΔTsol) restricts its practical applications. In this
research, the purpose is to investigate the effects of layer numbers on thermochromic
vanadium dioxide coatings with spacing, from 1-layer to 8-layer. Sample
characterisation were done using UV-Vis-NIR spectrophotometer and thermionic
scanning electron microscope (SEM). The best result was obtained from 2-layer VO2
thin film, with Tlum of 58.1% and ΔTsol of 9.5%. Further studies such as doping could
be done to reduce the critical temperature of VO2 for commercial utilization of VO2
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