A Facile Hydrothermal Method to Synthesize Ammonium Tungsten Bronze Nanoplatelets for NIR Absorption

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Lu, Huiyuan^1 ; Li, Hua^1,2 ; Chen, Yujie^1 ; Liu, Hezhou^1,2

State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, China^1

Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai

200240, China^2

关键词: Absorption abilities;    High crystallinity;    Hydrothermal conditions;    Hydrothermal methods;    Mixed valence state;    Near infrared light;    Sodium tungstate;    Visible transmittance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/2/022062/pdf
DOI  :  10.1088/1757-899X/382/2/022062

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Stable ammonium tungsten bronze (ATB, (NH4)xWO3) nanoplatelets with high crystallinity were synthesized via a one-step hydrothermal method without using any organic solvent, in which thiourea was employed as reducing agent and sodium tungstate was used as the starting material. The microstructure, phase and optical properties were controlled by varying hydrothermal conditions. The as-prepared samples exhibit a platelet-like morphology with a width range of 30-150 nm and length of 0.3-3 μm. The patterns of X-ray photoelectron spectroscopy (XPS) confirmed the presence of mixed valence states of tungsten. To check the optical properties, (NH4)xWO3-based films were obtained by uniformly casting its dispersion onto fused silica glass substrates. The films exhibited excellent near-infrared light (NIR) absorption abilities by selectively cut-off NIR region by 66.6% (transmittance decreased from 93% of a bare substrate to 26.4% of the films), while maintaining a high visible transmittance of 64.5%, promising its high potential for applications like solar light control filters.