Detailed Information on Publication Record
2019
Graphene nanosheet synthesis by oxygen and hydrogen enriched decomposition of ethanol in microwave plasma torch discharge
TOMAN, Jozef, Ondřej JAŠEK, Miroslav ŠNÍRER, Vít KUDRLE, Jana JURMANOVÁ et. al.Basic information
Original name
Graphene nanosheet synthesis by oxygen and hydrogen enriched decomposition of ethanol in microwave plasma torch discharge
Authors
TOMAN, Jozef (703 Slovakia, belonging to the institution), Ondřej JAŠEK (203 Czech Republic, guarantor, belonging to the institution), Miroslav ŠNÍRER (703 Slovakia, belonging to the institution), Vít KUDRLE (203 Czech Republic, belonging to the institution) and Jana JURMANOVÁ (203 Czech Republic, belonging to the institution)
Edition
30st International Conference on Diamond and Carbon Materials, Sevilla, Spain, 2019, 2019
Other information
Language
English
Type of outcome
Konferenční abstrakt
Field of Study
10305 Fluids and plasma physics
Country of publisher
Spain
Confidentiality degree
není předmětem státního či obchodního tajemství
RIV identification code
RIV/00216224:14310/19:00107911
Organization unit
Faculty of Science
Keywords in English
Graphene; nanosheets; microwave plasma; torch discharge
Změněno: 4/1/2020 15:51, Mgr. Jozef Toman, Ph.D.
Abstract
V originále
In the present work, a decomposition of ethanol vapours in microwave plasma torch discharge at atmospheric pressure conditions was investigated. The discharge was driven by a microwave generator set to standard frequency of 2.45 GHz, using microwave power from 140 to 350 W. Microwave line was terminated with an exchangeable dual channel carbon nozzle, allowing us to separately sustain the plasma by argon gas (220 - 920 sccm) flowing through the central (axial) channel and initiate synthesis by introduction of ethanol vapours (4 - 20 sccm) carried by argon (300 – 1400 sccm) through secondary channel (annulus). Ethanol molecule provides appropriate ratio of C, H and O atoms for graphene nanosheet synthesis. Disrupting the balance by addition of small amount (1 – 10 sccm) of molecular admixtures (O2 and H2), we were able to study the crucial parameters governing the assembly of carbon species into preferred graphene nanosheet structures. Optical emission spectroscopy (OES) was used to identify the nucleation density of active species such as C2 and C in the plasma and determination of neutral gas temperature approximated from rotational temperatures obtained by simulation of CN rotational spectra. To obtain more detailed information about the material structure Raman spectroscopy and XPS were used. The morphology of synthesized nanostructures was studied by SEM. Addition of oxygen to the process of ethanol decomposition has led to minor effect on the properties of graphene material however, hydrogen admixture had more significant impact on the plasma chemistry of MW discharge and synthesized carbon nanomaterial. Amount of graphene nanopowder decreases with oxygen admixture due to formation of CO in plasma.
Links
| GA18-08520S, research and development project |
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| LO1411, research and development project |
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