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

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, p...

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Veröffentlicht in:IOP conference series. Materials Science and Engineering 2018-07, Vol.382 (2), p.22062
Hauptverfasser: Lu, Huiyuan, Li, Hua, Chen, Yujie, Liu, Hezhou
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Li, Hua
Chen, Yujie
Liu, Hezhou
description 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.
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subjects Absorption
Fluid filters
Fused silica
Glass substrates
Morphology
Near infrared radiation
Optical properties
Photoelectrons
Reducing agents
Silica glass
Silicon dioxide
Synthesis
Transmittance
Tungsten bronze
Valence
X ray photoelectron spectroscopy
title A Facile Hydrothermal Method to Synthesize Ammonium Tungsten Bronze Nanoplatelets for NIR Absorption
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