Synthesis of Nano-WO3 Particles with Polyethylene Glycol for Chromic Film

摘要

Transparent WO3 films were successively prepared by sol-gel casting method. Their optical and structural properties were studied at various molecular weight of polyethylene glycol (PEG) containing in the film as a dispersing agent. The color contrast (AC) during film exposed to UV light represents the optical property. The WO3 film contained PEG (MW 2,000) exhibited the optimal photochromic performance which AC between colored and bleached state was 70. This optical property of WO3 films is promising higher color contrast and it is an important candidate for smart window application. Moreover, the structural properties of WO3 films were analyzed with x-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscope (SEM).