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Mesoporous SiO2/VO2 double-layer thermochromic coating with improved visible transmittance for smart window
Zhang, J; Wang, J; Yang, CM; Jia, HB; Cui, XM; Zhao, SC; Xu, Y
2017
Source PublicationSOLAR ENERGY MATERIALS AND SOLAR CELLS
ISSN0927-0248
Volume162Pages:134-141
Subtype期刊论文
AbstractThermochromic vanadium dioxide (VO2) film is a potential material for smart-window. But the high refractive index ( > 2) of VO2 coating in visible band resulted in strong reflection and low visible transmission. If another coating with a definite low refractive index is laid on VO2 film to construct a gradient index multilayer system, the total reflection could be effectively reduced. Therefore in this paper we designed a mesoporous SiO2/VO2 double-layer system in which the mesoporous SiO2 layer possessed an index adjustable from 1.243 to 1.354 to reduce the surface reflection of VO2-based smart window. The mesoporous structure has been investigated through several techniques including 2D GISAXS, TEM and N-2 ad/desorption. More important, a facile, safe and low-cost solution method was employed to prepare VO2 film with 60 nm thickness directly from ammonium citrato-oxovanadate (IV) compound that was reported by us previously. On this newly designed mesoporous SiO2/VO2 double-layer coating, the integral visible transmittance at 25 degrees C (T-vis,L) increased to 80.0% from 69.8% of pure VO2 coating while the corresponsive integral visible transmittance at 90 degrees C (T-vis,T-H) increased to 78.9% from 67.6% of pure VO2 coating, if the index of mesoporous SiO2 layer was optimized to 1.299. Simultaneously, the near infrared switching ability at 2000 nm (Delta T-2000) reached 29.0% and solar energy modulation (Delta T-sol) was maintained at 10.2%. The phase transition temperatures (T-t) for VO2 coating and the optimized SiO2/VO2 double-layer coating were 51.9 degrees C and 53.8 degrees C respectively, far below 68 degrees C of bulky VO2. This optical performance should be very attractive for application in the further smart window because of little increased cost and greatly enhanced property.
KeywordThermochromic Vo2 Mesoporous Sio2 Double-layer Coating Smart Window
DOI10.1016/j.solmat.2016.12.048
Indexed BySCI
Language英语
WOS IDWOS:000393720500017
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/27379
Collection中科院上海应用物理研究所2011-2018年
Recommended Citation
GB/T 7714
Zhang, J,Wang, J,Yang, CM,et al. Mesoporous SiO2/VO2 double-layer thermochromic coating with improved visible transmittance for smart window[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS,2017,162:134-141.
APA Zhang, J.,Wang, J.,Yang, CM.,Jia, HB.,Cui, XM.,...&Xu, Y.(2017).Mesoporous SiO2/VO2 double-layer thermochromic coating with improved visible transmittance for smart window.SOLAR ENERGY MATERIALS AND SOLAR CELLS,162,134-141.
MLA Zhang, J,et al."Mesoporous SiO2/VO2 double-layer thermochromic coating with improved visible transmittance for smart window".SOLAR ENERGY MATERIALS AND SOLAR CELLS 162(2017):134-141.
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