2021 Volume 54 Issue 10 Pages 557-565
Metallic tungsten nanoparticles have attracted considerable attention because of their unique structures and excellent performances. This paper describes the synthesis of a mixture of tungsten metal and oxide nanoparticles via a fuel-rich tubular flame process, followed by mild-reduction-based post-heating treatment. The high combustion efficiency of the tubular flame process enables complete consumption of O2 in the premixture, along with the emission of CO and H2. The experimental results revealed that the tubular flames produced mixtures of amorphous tungsten oxide and crystalline tungsten nanoparticles with primary particle sizes of 5–10 nm, at a production rate of 4.68 mg/h and yield of 8.64%. These nanoparticles exhibited a sinter-necked structure. The oxygen content of the tubular-flame-synthesized mixtures of tungsten metal and oxide nanoparticles (16.80%) to 5.56% after the additional post-heating treatment, which also retained the particle size.
