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2024-11-23 18:05

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Conference: Bucharest University Faculty of Physics 2017 Meeting

Section: Optics, Spectroscopy, Plasma and Lasers

Title:

Tungsten micro- and nanoparticles synthesis under atmospheric pressure plasma conditions

Authors:

Valentina MARASCU (1,2), Andrada LAZEA-STOYANOVA (1), Cristian STANCU (1), Gheorghe DINESCU (1,2)

^*
Affiliation:

1) National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125, Magurele, Romania

2) Faculty of Physics, University of Bucharest, 405 Atomistilor Street, 077125, Magurele, Romania

E-mail

valentina.marascu@infim.ro

Keywords:

tungsten particles, atmospheric pressure plasma

Abstract:

Production of metallic particles is an important research topic due to the particles usage in applications such as nanotechnology and biotechnology domains [1], solar cells [2], and so on [3]. Besides their useful role in applications, metallic particles have as drawback the fact that are a source of contamination. For example in ITER tokamak, the tungsten particles, which were formed during plasma – walls interactions, incorporates tritium leading to environment contamination [4]. Therefore, synthesis of tungsten particles is important for future develop of particles decontamination techniques.In our paper we focus on obtaining tungsten micro- and nanoparticles by using a radiofrequency (13.56 MHz) plasma at atmospheric pressure [3]. Tungsten particles were generated as a result of plasma – tungsten powered electrode interactions. Argon was used as discharge gas. The particles were collected on silicon substrate. By varying the applied RF input power, argon gas flow rate and tungsten electrode diameter, we have obtained tungsten particles ranging from ~70 nm up to few microns. The obtained particles present various shapes: spherical, cauliflower or cubic. The atmospheric pressure plasma was investigated by high resolution optical emission spectroscopy. The morphology and the elemental analysis of the metallic particles were investigated by Scanning Electron Microscopy and Energy-dispersive X-ray spectroscopy.

References:

[1] N Nafarizal, et al., J. Phys. D: Appl. Phys. 45 (2012) 505202 (6pp).

[2] C.S. Solanki, et al., Thin Solid Films 451 (2004) 649.

[3] A. Lazea-Stoyanova, et al., Plasma Processes and Polymers, 2015,12, 705-709.

[4] C. Grisolia et al, Journal of Nuclear Materials 463 (2015) 885–888.

Acknowledgement:

V. Mărăscu acknowledges support from the project 1-EU12 WPEDU-RO, "EUROfusion Consortium contribution to education in fusion research at the predoctoral and PhD level", Joint Research Unit - Institute for Atomic Physics, Romania. Partially, this work has been financed in the frame of the Nucleus programme- contract 4N/2016 (INFLPR), and of the projects PN-II-RU-TE-2014-4-2412 and PN-II-RU-TE-2014-4-2035.