Nanoporous thermochromic VO2 (M) thin films: Controlled porosity, largely enhanced luminous transmittance and solar modulating ability

Xun Cao, Ning Wang, Jia Yan Law, Say Chye Joachim Loo, Shlomo Magdassi, Yi Long*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

Vanadium dioxide is the most widely researched thermochromic material with a phase transition temperature (τc) of around 68 C, and its thermochromic performance can be enhanced by adding nanoporosity. Freeze-drying has been employed to fabricate nanostructures with different porosities from 16 to 45% by varying the prefreezing temperature and precursor concentration. The luminous transmittance (Tlum) and solar modulating ability (ΔTsol) are greatly enhanced as a result of increasing pore size and pore density. The freeze-dried sample with 7.5 mL of H 2O2 precursor dip-coated at 300 mm/min gives the best combination of thermochromic properties (Tlum ≈ 50%, ΔT sol = 14.7%), which surpasses the best combined thermochromic performance reported to date that we are aware of (Tlum ≈ 41%, ΔTsol = 14.1%).

Original languageAmerican English
Pages (from-to)1710-1715
Number of pages6
JournalLangmuir
Volume30
Issue number6
DOIs
StatePublished - 18 Feb 2014

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