Periodic micro-patterned VO2 thermochromic films by mesh printing.


Lu Q, Liu C, Wang N, Magdassi S, Mandler D, Long Y. Periodic micro-patterned VO2 thermochromic films by mesh printing. J. Mater. Chem. CJournal of Materials Chemistry C: Materials for Optical and Electronic Devices. 2016;4 (36) :8385 - 8391.

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VO2 has garnered much attention in recent years as a promising candidate for thermochromic window applications due to rising awareness about energy conservation. However, the trade-off between improving the luminous transmittance (Tlum) and solar modulation ability (ΔTsol) limits the commercialization of VO2-based smart windows. Four major nanostructuring approaches were implemented to enhance both Tlum and ΔTsol, namely nanocomposites, nanoporous films, biomimetic moth-eye structures and anti-reflection coating (ARC) multilayers. This work demonstrates a novel approach that fabricates periodic, micro-patterned structures of VO2 using a facile screen printing method. The micro-patterned structure is able to favorably transmit visible light without sacrificing high near-IR modulation, and the patterned film shows improved Tlum (67% vs. 60%) and ΔTsol (8.8% vs. 6.9%) compared with continuous films. By varying the thickness, periodicity and solid concn., this approach can give a ΔTsol of 14.9% combined with a Tlum of 43.3%, which is comparable, if not superior to, some of the best reported results found using other approaches. [on SciFinder(R)]


CAPLUS AN 2016:1185251(Journal; Online Computer File)