Synthesis of Sodium Tungsten Bronze via Hydrothermal Method Assisted by Citric Acid

Abstract:

Sodium tungsten bronze Na_xWO₃ powders have been prepared by hydrothermal method using sodium tungstate as raw material and citric acid as reducing agent, followed by annealing under the inert gas N₂ atmosphere. The prepared powders were confirmed as tetragonal sodium tungsten bronze Na_0.1WO₃ by X-ray diffraction. The SEM observation showed that the as-prepared Na_0.1WO₃ particles exhibited rod-like morphology with about 20 μm in length and 5 μm in diameter. The influence of pH value of the precursor solution and annealing temperature on the synthesized powders were also investigated. The results indicated that sodium tungsten bronze Na_XWO₃ would not be obtained when the pH value of the precursor solution decreased to pH=1 or the annealing temperature was lower than 700°C by this hydrothermal method. Additionally, as the wavelength increasing, the transmittance of prepared Na_xWO₃ exhibited higher visible light transparency with reaching up to about 58% and a downward trend in near-infrared area, which indicates that the prepared Na_0.1WO₃ have potential application as near-infrared shielding material.

• Periodical: Advanced Materials Research (Volumes 712-715)
• Pages: 280-283
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.712-715.280
• Online since: June 2013
• Authors: Jia Yu Luo, Jing Xiao Liu, Fei Shi, Qiang Xu, Yan Yan Jiang, Gui Shan Liu, Zhi Qiang Hu
• Keywords: Citric Acid (CA), Hydrothermal Synthesis, N₂ Annealing, Na_xWO₃, Tungsten Bronze

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