Fabrication of highly dispersed NiTiO3@TiO2 yellow pigments with enhanced NIR reflectance

The highly dispersed NiTiO3@TiO2 yellow pigments with core-shell structure were prepared through calcinations of precursors obtained from the precipitation of Ni2+ on the surface of TiO2 particles. The synthesized pigments were characterized by XRD, SEM, TEM, UV-vis-IR spectroscopy. The results showed that the pigments were consisted of TiO2 core and outer ilmenite NiTiO3 shell. UV-vis diffuse reflectance spectroscopy results showed the enhance reflection peak at ∼580 nm of the NiTiO3@TiO2 pigments result in a better yellow color than that of the pure NiTiO3 pigments. Compared with pure NiTiO3 pigments, the NiTiO3@TiO2 pigments also presented a much higher NIR reflectance. The mechanism analyzed results indicated that the reason was attributed to the special core-shell structure. The solar reflective coating colored by the NiTiO3@TiO2 pigments reduced the inner surface temperatures of glass plates by approximately 8.7 °C.