Jul 2 – 6, 2018
Žofín Palace
Europe/Prague timezone

P1.3010 Plasma diagnostics during microwave plasma synthesis of graphene nanosheets

Jul 2, 2018, 2:00 PM
2h
Mánes

Mánes

Masarykovo nábřeží 1, 110 00 Praha 1

Speaker

Miroslav Snirer

Description

See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.3010.pdf Plasma diagnostics during microwave plasma synthesis of graphene nanosheets M. Snirer, V. Kudrle, O. Jasek, J. Toman, J. Jurmanova CEPLANT, Masaryk University, Brno, Czech Republic Graphene nanosheets possess many extraordinary properties with promising applications, e.g. in energy storage. However, suitable technique for cost effective synthesis is needed. Microwave plasma is one of the considered techniques but requires further diagnostics of the influence of different parameters to control the synthesis and to yield a high quality graphene [1]. Graphene nanosheets were synthesized by decom- position of precursor (ethanol) vapours in argon mi- crowave plasma excited by surface wave launcher (surfaguide [2]) at 2.45 GHz. The synthesis process took place in the volume, i.e. no substrate or cata- lyst was needed and the product was in a flake form. Their quality could be controlled by the flow of carrier gas, the amount of precursor and the input microwave power. We performed the synthesis in both low pres- sure and atmospheric pressure regimes. Different ar- gon flows were tested in the range 0.2-3 L/min with various ethanol percentages. The main plasma parame- ters were studied by optical emission spectroscopy and Figure 1: Emission spectra of Ar plasma microwave interferometry. Spatial evolution of the gas with ethanol admixture (top) and SEM temperature was calculated from the emission spec- image of graphene flake. Experimental tra, too. The synthesized graphene sheets were ana- conditions: 350 W argon 280 sccm, pres- lyzed by Raman spectroscopy and scanning electron sure 500 Pa, partial pressure of ethanol microscopy. vapours 66 Pa. This work was supported by the Czech Science Foundation under project 18-08520S and in part by the project LO1411 (NPU I) funded by Ministry of Education, Youth and Sports of Czech Republic. References [1] M. Aliofkhazraei, N. Ali, W.I. Milne, C.S. Ozkan, S. Mitura, J.L. Gervasconi, Graphene Science Book, 2016. [2] M. Moisan, Z. Zakrzewski, Plasma sources based on the propagation of electromagnetic surface waves. J. Phys. D: Appl. Phys. 24, 1025 (1991).

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