Abstract
Graphene oxide and reduced graphene oxide based nanocomposites of the well-known thermochromic material VO2 were synthesized by an in situ hydrothermal process, and their temperature dependent reflectance was studied. The nanocomposites were characterized using various techniques to observe the changes that occurred in the morphology, structure, and optical absorption of VO2 nanostructures due to the introduction of graphene oxide as well as reduced graphene oxide. The UV-Vis-NIR (200 nm–1100 nm) spectroscopy at two different temperatures, below and above the transition temperature showed that the reflectance of IR radiation was enhanced with the addition of GO as well as rGO, indicating the improved thermochromic behavior of the nanocomposites.
Highlights
Vanadium dioxide (VO2) is a material widely being explored for its thermochromic property, which finds application in technologies such as energy efficient smart windows
The peak at 25.25○ of VO2 showed relative broadening in the case of the composites, which may be due to the introduction of Graphene oxide (GO) and reduced graphene oxide (rGO) flakes
The images showed that the synthesized VO2 nanostructures had a flower-like morphology, which became less agglomerated after the scitation.org/journal/adv addition of GO and rGO in the nanocomposites
Summary
Vanadium dioxide (VO2) is a material widely being explored for its thermochromic property, which finds application in technologies such as energy efficient smart windows. Graphene and graphene oxide have interesting opto-electronic properties and are used for making many smart functional materials.43 VO2 based thermochromic films have been made on graphene,25 which exhibited mechanical flexibility and showed efficient switching of behavior across the phase transition.
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