Expanding the Spectral Tunability of TiO2 Nanocrystals by Codoping with Fluorine and Tungsten for Energy-Efficient Windows

作者：Zhou, Changwei; Wu, Xiaomei; Gao, Qiang^*

来源：ACS Sustainable Chemistry & Engineering, 2022, 10(27): 8733-8742.

DOI：10.1021/acssuschemeng.2c00980

• applications energy-saving glazing
• eenergy-saving glazing
• titania oxide
• codoping
• infrared screening
• localized surface plasmon resonance (LSPR)
• carbon neutral

ABSTRACT: Exploitation of new solar blocking materials is crucial for low-carbon architectures. F-W codoped TiO2 with superior solar screening performance was prepared. The effects of codoping and reaction temperature on the composition and infrared screening performances of TiO2 nanoparticles were studied. Codoping with W and F produced spindle-shaped anatase TiO2 with a particle size of 7.7 nm. Tungsten substituted for titanium and fluorine substituted for oxygen in the lattices. XPS and EPR analyses verified the existence of abundant Ti3+ ions in the codoped TiO2. It was observed that the codoped TiO2 showed the strongest infrared blocking activity in comparison to the F-doped and undoped TiO2. The NIR screening efficiency of the coatings reaches 70.1% after codoping with 20% of tungsten and 30% of fluorine. Briefly, the enhanced NIR blockage activity of codoped TiO2 was the synergistic effect of F and W. The codoping of F and W increased the electron concentration in TiO2 and enhanced the NIR plasmonic absorption. Furthermore, the F-W codoped TiO2 films reduced the indoor temperature of the simulated house by 9.9 degrees C. Thus, the F-W codoped TiO2 films have potential applications in the field of energy-saving glazing.