This study investigates the role of different imidazolium ionic liquids on stabilizing vanadyl acetylacetonate and proposes a method for preparing monoclinic vanadium oxide thin films. It is found that a specific imidazolium ionic liquid has the best coordinating ability to protect the central vanadium atom from oxidation. The prepared films exhibit excellent thermochromic properties with a solar modulation efficiency of 20.3%.
This study examines the role of different imidazolium ionic liquids (ILs) on the stabilization of vanadyl acetylacetonate, VO (acac)(2), as a vanadium precursor by using UV-Vis spectroscopy. The possible stabilization mechanisms of VO (acac)(2) in IL solution were investigated. Furthermore, a fabrication method is proposed to prepare monoclinic vanadium oxide VO2 (M) thin films using a mixture of ionic liquid and poly-ionic liquid (PIL). The ILs 1-ethyl 3-allyl imidazolium bis(tri-fluoromethansulfonylimide) ([EAIM] [TFSI]), 1-ethyl 3-methyl imidazolium trifluoromethanesulfonate ([EMIM] [TFO]) and 1-ethyl 3-methyl imidazolium acetate ([EMIM] [AcO]) were investigated. It is shown that ([EAIM] [TFSI]) has the best coordinating ability to VO (acac) 2 for protecting the central vanadium atom from oxidation. For thermochromic film formation, the effect of annealing temperature (250 degrees C - 400 degrees C) and time (10 minutes - 120 minutes) on crystallization was studied using X-ray diffraction. The possible role of PIL decomposition on the formation and crystallization of VO2 (M) is discussed. The prepared films showed excellent thermochromic properties with 20.3 % solar modulation efficiency.
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