Hydrothermal Synthesis of One-dimensional Tungsten Trioxide Nanowires

As a typical transition metal oxide functional material, tungsten trioxide has been extensively studied by researchers in lithium ion batteries, electrochromic, photochromic, photoluminescence and sensors due to its rich chemical valence. In addition, WO₃ is an important n-type semiconductor photocatalyst, and shows high catalytic activity in the field of photocatalytic degradation of pollutants in water.

Recently, some scholars have published a hydrothermal synthesis for preparing one-dimensional tungsten trioxide nanowires. The process includes:

(1) Preparation of precursors of tungsten molybdic acid
0.552g tungsten powder and 0.055g molybdenum powder were added to 100 mL flask, and then 1.0mL water was added. After the dispersion of tungsten powder and molybdenum powder in water was uniform, 1.0mL H₂O₂ was added. After the reaction, the flask was sealed with fresh-keeping film, and the precursor solution of tungsten-molybdenum acid was obtained after 24 hours of static overnight.

(2) Hydrothermal Reaction
In the precursor solution of tungsten molybdic acid, 0.8mL 2.4M sodium hydroxide solution was slowly added. After stirring, 8 mL of water was added, and then the mixed liquid was transferred into 50 mL PTFE liner and loaded into 50 mL stainless steel jacket. After 8 hours of hydrothermal reaction at 180 ℃, WO₃ mixture was naturally cooled to room temperature.

(3) Post-processing
Steps (2) were washed with water and absolute ethanol for several times, and the solid was dried at 60 C for 12 hours to obtain one-dimensional WO₃ nanowires.

The obtained one-dimensional tungsten trioxide nanowires have a diameter of less than 10 nm, uniform size and good monodispersity. Meanwhile, it improves the disadvantage of easy reunification and large size of the general tungsten trioxide nanowires, and has unique characteristics.

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