Investigating the Impact of Growth Time and Methane Flow on Graphene Synthesis using Nickel Foil

Year 2021, Volume: 24 Issue: 3, 1181 - 1186, 01.09.2021

Meryem Bozkaya Ali Altuntepe , Hakan Ateş , Recep Zan

https://doi.org/10.2339/politeknik.869535

Abstract

Graphene has been one of the most investigated nanomaterials in recent years due to its one atom thickness nature and its extraordinary properties such as high conductivity and excellent transmittance in visible range, bendability and high carrier mobility. Although there are many techniques to grow graphene, chemical vapor deposition technique is one of the best approach to synthesize homogeneous and commercial scale graphene in thin film form. Many parameters can affect the quality and homogeneity of the graphene film that is grown with this technique. In this study, two growth parameters which are methane flow rate and growth time were investigated to find out their effect on the quality of the graphene film, which is grown on nickel foil. Graphene film grown with different flow rates of methane (from 20 to 50 sccm) and growth time (50 to 20 mins.) were examined. We found that single layer graphene film could only be grown under 20 sccm methane flow in 20 mins. growth time as evidenced via Raman spectroscopy measurements. Furthermore, the single layer graphene film was found to be in high homogeneity as confirmed by Raman mapping. On the other hand, multi-layer graphene film was obtained by increasing both methane flow and growth time.

Keywords

Graphene, CVD, nickel, growth, raman spectroscopy

Nikel Folyo Üzerinde Büyüme Süresi ve Metan Akışının Grafen Sentezi Üzerindeki Etkisinin İncelenmesi

Abstract

Grafen, yüksek taşıyıcı mobilitesi, yüksek esneklik ve görünür bölgede yüksek ışık geçirgenliğinden dolayı en çok araştırılan nanomalzemelerden biri haline gelmiştir. Birçok üretim tekniği olmasına karşın kimyasal buhar biriktirme yöntemi, homojenlik, geniş ölçekli gafen sentezi gibi özellikleri sayesinde grafen üretiminde en çok kullanılan yaklaşım haline gelmiştir. Yüksek kalitede geniş ölçekli sentez için bu teknikte bir çok parametre etkili olmaktadır. Bu çalışmada, nikel folyo üzerinde büyütülen grafen için metan akış hızı ve büyüme süresi olmak üzere iki büyüme parametresi incelenmiştir. Farklı metan akış hızları (20 sccm’den 50 sccm) ve büyüme süresi (50 dakiakadan 20 dakikaya) ile büyütülen grafen filmler incelenmiştir. Tek katmanlı grafen filmin, Raman spektroskopi ölçümleriyle gösterildiği üzere, 20 dakika büyüme süresinde yalnızca 20 sccm metan akışı altında sentezlenebildiği belirlenmiştir. Ayrıca, tek katmanlı grafen filmin, Raman haritalaması ile teyit edildiği üzere yüksek homojenlikte olduğu belirlenmiştir. Öte yandan, hem metan akışını hem de büyüme süresini artırılarak çok katmanlı grafen filmi elde edilmiştir.

Keywords

Grafen, CVD, nikel, büyütme, raman spektroskopisi

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