Hetero-assembly design of 2D oxide nanosheets for tailored thermal shielding materials

Abstract

We present a new approach for designing thermal shielding materials using two-dimensional (2D) oxide nanosheets. Our approach is hetero-assembly design [(Ti0.87O2)m(Cs2.7W11O35−d)20 (m = 0, 5, 10) ] by overlaying high refractive index (n) Ti0.87O2 nanosheets with transparent conducting Cs2.7W11O35−d nanosheets. By a proper design of the thickness of high-n Ti0.87O2 layers, we achieved the optimum thermal shielding properties with a high NIR reflectance (> 46%), a high visible transparency (> 76%) and a neutral color in an ultrathin form (< 60 nm). Our nanosheet approach is of technological importance for exploring new thermal shielding materials.