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tungsten nanopowder (also known as tungsten nanodots or tungsten nanopowder) are black spherical high surface area metal particles typically with specific surface area in the 1 – 5 m2/g range. AE Nano produces a wide range of passivated, ultra-high purity and coated and dispersed forms.

Synthesis of tungsten nanopowder

tungsten nanopowder can be synthesized by several methods, including thermal decomposition of tungsten hexacarbonyl (W(CO)6), ball milling, electric wire explosion, magnetron sputtering and self-propagating high temperature synthesis. These processes offer bulk production rate and scalability with good product crystallinity.

In a recent study, tungsten nanoparticles were produced via a stepwise carbothermal hydrogen reduction (CHR) of Wcl6 on a carbon support. The resulting material was successfully characterized by powder X-ray diffraction and X-ray photoelectron spectroscopy. The resulting tungsten nanoparticles simultaneously exhibit the metallic W(0) and carbide W(d+) character, which is an unexpected occurrence for this material.

The chemical state of the tungsten nanoparticles was further characterized by high-temperature X-ray absorption near edge structure (XANES) and X-ray photoelectron spectrum measurements. Upon heating the nanoparticles, their crystallites grew into metastable tungsten hexacarbonyl and thermodynamically stable tungsten carbide phases, respectively.

Tungsten nanoparticles can be used for a variety of applications including gas sensing, photothermal conversion, photodetection, luminescent materials, etc. The unique capability of restricting light at a nanoscale dimension provides the material with exceptional features, such as large electromagnetic field enhancements, high photothermal conversion efficiency, rich spectral responses and excellent resonant emission properties [2-4]. Tungsten is also used in mechanical and mechanico chemical applications, which take advantage of its high hardness and toughness.

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