GRAPHENE NANOSHEETS SYNTHESIZED IN MICROWAVE PLASMA AND LIQUID EXFOLIATED GRAPHENE: STRUCTURAL CHARACTERIZATION STUDY

JURMANOVÁ, Jana, Ondřej JAŠEK, Jozef TOMAN, Miroslav ŠNÍRER and Vít KUDRLE. GRAPHENE NANOSHEETS SYNTHESIZED IN MICROWAVE PLASMA AND LIQUID EXFOLIATED GRAPHENE: STRUCTURAL CHARACTERIZATION STUDY. In TANGER Ltd., Keltickova 62, 710 00 Ostrava, Czech Republic, EU. NANOCON 2018 Conference Proceedings, Peer Reviewed. 1st ed. Ostrava: TANGER Ltd., Ostrava, 2019, p. 63-68. ISBN 978-80-87294-89-5.

Basic information

• Original name: GRAPHENE NANOSHEETS SYNTHESIZED IN MICROWAVE PLASMA AND LIQUID EXFOLIATED GRAPHENE: STRUCTURAL CHARACTERIZATION STUDY
• Name in Czech: Studium struktury grafénu připravého v mikrovlnném plazmatu a exfoliováného v kapalině
• Authors: JURMANOVÁ, Jana (203 Czech Republic, belonging to the institution), Ondřej JAŠEK (203 Czech Republic, guarantor, belonging to the institution), Jozef TOMAN (703 Slovakia, belonging to the institution), Miroslav ŠNÍRER (703 Slovakia, belonging to the institution) and Vít KUDRLE (203 Czech Republic, belonging to the institution).
• Edition: 1. vyd. Ostrava, NANOCON 2018 Conference Proceedings, Peer Reviewed, p. 63-68, 6 pp. 2019.
• Publisher: TANGER Ltd., Ostrava

Other information

• Original language: English
• Type of outcome: Proceedings paper
• Field of Study: 10305 Fluids and plasma physics
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• Publication form: storage medium (CD, DVD, flash disk)
• WWW: URL
• RIV identification code: RIV/00216224:14310/19:00108183
• Organization unit: Faculty of Science
• ISBN: 978-80-87294-89-5
• UT WoS: 000513131900010
• Keywords (in Czech): Grafén;elektrochemie;senzory;mikrovlny;plazma
• Keywords in English: Graphene; electrochemistry; sensor; microwave plasma
• Tags: rivok
• Tags: International impact, Reviewed

Abstract

Graphene based nanomaterials produced by liquid exfoliation techniques and microwave plasma decomposition of ethanol were studied by scanning electron microscopy (SEM), Raman spectroscopy and XRay powder diffraction (XRD). Graphene oxide (GO) and reduced graphene oxide (r-GO) prepared by liquid exfoliation technique consisted of several types of structures - thin flakes with thickness of 10-15 nm and lateral dimensions of several micrometers and graphite like structures, 100 mikrometer in size, with not fully exfoliated graphene layers. The graphene nanosheets prepared in microwave plasma torch (MWGNs) were several nm thick and rectangular in shape with size of several hundred nanometers. Contamination by elements S, Mn and K was detected by EDX analysis in both GO and r-GO samples. Similarly, Fe was detected in MWGNs. This contamination was caused by synthesis process in all cases. The Raman spectroscopy analysis showed presence of D (1360 cm-1] and G (1580 cm-1) band and second order 2D (2690 cm-1) and D+G (2920 cm-1) in the measured spectra. The ID/IG intensity ratio was 2.2 and 2.5 for GO and r-GO samples, respectively. The graphene nanosheets Raman spectra exhibited ID/IG ratio of 0.5 and high intensity 2D peak at 2690 cm-1. XRD analysis revealed graphite like structure, graphite peak (002), of all samples and presence of contamination (Fe, intercalation compounds) in agreement with EDX analysis results. XPS analysis confirmed results of XRD and Raman analysis and sp2/sp3 ratio of carbon C1s peak was increasing with decreasing ID/IG intensity ratio.

Abstract (in Czech)

Grafénové nanomateriály připravené exfoliací z kapalin a v mikrovlnném plazmatu rozklad ethanolu byly studovány pomocí skenovací elektronovou mikroskopií (SEM), Ramanovou spektroskopií a rengetovou prášková difrakcí (XRD). Oxid grafénu (GO) a redukovaný oxid grafénu (r-GO) připravený exfoliací se skládal z několika typů struktur - tenkých vloček o tloušťce 10-15 nm a délce několika mikrometrů a grafitových struktur, velikosti 100 mikrometrů, s neúplně zcela exfoliovanými grafenovými vrstvami. Grafenové nanosheety připravené v mikrovlnném plazmovém hořáku (MWGN) byly několik nm tlusté a měli obdélníkový tvar o velikosti několika stovek nanometrů. Kontaminace prvky S, Mn a K byla detekována analýzou EDX ve vzorcích GO a r-GO. Podobně byl Fe detekován v MWGN. Tato kontaminace byla ve všech případech způsobena procesem syntézy. Ramanova spektroskopicke ukázala přítomnost D (1360 cm-1) a G (1580 cm-1) pásu a 2D pásu (2690 cm-1) a D + G (2920 cm-1) v naměřeném spektru. Poměr intenzity ID/IG byl 2,2 a 2,5 pro vzorky GO a r-GO. Grafenové nanosheety vykazovaly poměr ID/IG 0,5 a vysokou intenzitu 2D píku na vlnočtu 2690 cm-1. XRD analýza odhalila grafitovou strukturu, grafitový pík (002), všech vzorků a přítomnost kontaminace (Fe, interkalační sloučeniny) v souladu s výsledky analýzy EDX. XPS analýza potvrdila výsledky XRD a Ramanovské spektroskopie a poměr sp2 / sp3 píku uhlíku v C1s spektru se zvyšoval s klesajícím poměrem intenzity ID/IG.

Links

• GA18-08520S, research and development project: Name: Studium procesu nukleace dvourozměrných uhlíkových nanostruktur v mikrovlnném plazmatu

Investor: Czech Science Foundation

• LO1411, research and development project: Name: Rozvoj centra pro nízkonákladové plazmové a nanotechnologické povrchové úpravy (Acronym: CEPLANT plus)

Investor: Ministry of Education, Youth and Sports of the CR