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 °C. Thus, the F–W codoped TiO2 films
have potential applications in the field of energy-saving glazing.