Spectively, and calculated in the course of the heating and cooling cycles the films and 71.3 through the heating and Vorinostat Data Sheet transition width of the hysteresis loop was approximately the transition is significantly the cooling cycles were 71.eight and 71.three , respectively, and 0.five C, which width in the hysteresis loop was around 0.five , Furthermore, the resistivity decreased by more low for a phase transition (Figure 6d,e). which can be considerably low for any phase transition than two orders of magnitude for the duration of the phase transition, indicating the high crystallinityNanomaterials 2021, 11, x FOR PEER REVIEWNanomaterials 2021, 11,eight of8 of(Figure 6d,e). Furthermore, the resistivity decreased by a lot more than two orders of magnitude through the phase transition, indicating the high crystallinity of VO2(M) films. Howof VO2 deposition temperature of 250 is temperature of 250 C is still that common ever, the(M) films. Having said that, the deposition still larger than the temperature greater than the temperature that typical polymer films the withstand, which RHC 80267 custom synthesis limits the utilization of polymer films can withstand, which limits can utilization of a variety of versatile polymeric various versatile than PI. substrates other than PI. substrates other polymericFigure six. (a) Schematic representation and (b) cross-sectional scanning electron microscopy image Figure six. (a) Schematic representation and (b) cross-sectional scanning electron microscopy image of VO2 /Cr2 /polyimide (PI) film; (c) (c) Photograph of flexible 2/Cr /Cr2 O3 /PI film, (d) Ultravioletof VO2/Cr2O3O3 /polyimide (PI) film; Photograph of versatile VOVO22O3/PI film, (d) Ultraviolet isivisible ear-IR (NIR) transmittance spectra of flexible/Cr2O/Cr2film after multiple bending cycles; ble ear-IR (NIR) transmittance spectra of flexible VO2 VO2 3/PI O3 /PI film following many bending cycles; (e) Temperature-dependent transmittance hysteresis loop nm) nm) of flexible /Cr two /Cr2 film. (e) Temperature-dependent transmittance hysteresis loop (2500 (2500 of flexible VO2VO2O3/PIO3 /PI film. Reproduced with permission from [94]. Copyright 2021, Elsevier. Reproduced with permission from [94]. Copyright 2021, Elsevier.Though direct deposition of VO2 (M) on substrates with higher thermal resistance is While direct deposition of VO2(M) on substrates with high thermal resistance is often a straightforward single-step approach, only a limited variety of substrates might be utilised under higha basic single-step approach, only a restricted quantity of substrates may be employed below hightemperature deposition circumstances. In contrast, the film-transfer method presents opportutemperature deposition conditions. In contrast, the film-transfer procedure delivers opportunities to utilize different varieties of polymeric substrates for the fabrication of of flexible films nities to utilize several types of polymeric substrates for the fabricationflexible films [96]. Within this approach, VO (M) films are are deposited on rigid substrates by way of high-temperature [96]. In this approach,2VO2(M) films deposited on rigid substrates by way of high-temperature vacuum deposition and thermal annealing; then, the VO (M) thin films are are transferred vacuum deposition and thermal annealing; then, the 2VO2(M) thin films transferred onto flexible polymeric substrates employing the film-transfer method. As the VO2(M) films are onto flexible polymeric substrates applying the film-transfer course of action. Asthe VO2 (M) films are deposited below high-temperature circumstances, they come to be extremely crystalline, attaining deposited below h.