Preparation and characterization of nano bismuth titanate powders with high reflectivity in near-infrared waveband

17th IUMRS International Conference in Asia

Jia, Y.H.^1 ; Wu, Y.B.^1 ; Huang, Y.^1,2 ; Zhou, Z.H.^1,2 ; Shen, S.^3

College of Materials, Xiamen University, Xiamen

361005, China^1

Fujian Key Laboratory of Advanced Materials, Xiamen, Fujian

361005, China^2

CSIRO Manufacturing, Clayton

VIC

3168, Australia^3

关键词: Bismuth nitrates;    Broad application;    Dispersibilities;    High reflectivity;    Near-infrared waveband;    Tetra-butyl titanate;    Thermal insulation materials;    UV-VIS-NIR spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012039/pdf
DOI  :  10.1088/1757-899X/182/1/012039

来源: IOP

【 摘 要 】

Nano powders with high reflectivity in near-infrared waveband have broad applications as thermal insulation materials. In this study, nano bismuth titanate powders with the reflectance to near-infrared of as high as 89.5% in average were prepared via a sol-gel method by using tetrabutyl titanate, bismuth nitrate as raw materials and citric acid, acetic acid as reaction adjuvant reagents. Furthermore, to control the reflectivity in the visible light waveband, the as-prepared nano bismuth titanate powders were further coated with nano-Ag by using NaBH4as a reduction agent. The influence of different dispersants on reflectivity and on powder dispersibility has also been studied. SEM characterization demonstrates that PEG1000, worked as a dispersant, significantly enhances the dispersion of bismuth titanate powders comparing with non-dispersant system. UV-Vis-NIR spectra reveal that with addition amount of AgNO3of 1.5 ml and PEG1000 as the dispersant, the Ag-coated bismuth titanate nano powders can reach about 60% of reflectance to near-infrared, while the reflectance of visible light can be controlled as low as around 14%. It is very promising for such nano powders to be used in thermal insulation glass materials.