نوع مقاله : مقاله پژوهشی
نویسندگان
دانشکده فیزیک، دانشگاه تبریز، تبریز، ایران
چکیده
Nowadays, cold plasma technology is recognized as a prominent green synthesis and treatment method of nanomaterials which is chemical-free and cost-effective. Based on treating materials, cold plasma technology is operated by gas excitation via an applied energy source, leading to plasma generation with reactive chemical species, charged positive and negative particles, radicals, and heat energy. Considering the plasma characteristics in materials synthesis and treatment, the effect of exerting cold radio frequency low-pressure plasma on the quantum size effect of tungsten trioxide nanoparticles synthesized by cold direct current atmospheric plasma interaction with water was investigated. Nitrogen and argon radio frequency plasmas decreased the nanoparticles size, while oxygen radio frequency plasma increased the nanoparticles size. In oxygen plasma, the energy level approached the quasi-continuous band structure in bulk solid, and the band gap energy was reduced. In nitrogen and argon plasmas, the energy level approached quasi-discrete band structure, and the band gap energy increased.
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