A Study on the Expansion of Graphite Layers Via In-Situ Polymerization of Melamine

Year 2023, , 169 - 177, 28.12.2023

Tuğrul Yumak

https://doi.org/10.33484/sinopfbd.1366684

Abstract

Graphene, renowned for its honeycomb lattice structure formed by densely packed sp2 hybridized carbon atoms, possesses exceptional electronic, thermal, chemical, and mechanical properties. The van der Waals-coupled graphene layers give rise to the well-known AB stacking, forming graphite. Despite the existence of several methods for graphite production, the production of graphene on a large scale remains challenging due to the lack of efficient techniques and the introduction of structural defects during the production process. Exfoliated graphite (EG), a potential solution, is typically derived from the thermal treatment of graphite intercalation compounds (GICs). Melamine, notably displaying significant expansion properties at low temperatures, has been used as an intercalation compound in limited studies. This study investigates the potential of melamine to induce the expansion of graphene layers when incorporated into graphite and subjected to thermal treatment. Raman and X-ray diffraction analyses were employed to assess structural changes.

Keywords

Graphite, expansion of graphite, g-C3N4, thermal treatment

Melaminin Yerinde Polimerizasyonu ile Grafit Katmanlarının Genişletilmesi Üzerine Bir Çalışma

Abstract

Yoğun bir şekilde paketlenmiş olup sp2 hibritlenmiş karbon atomlarından oluşan bal peteği kafes yapısıyla bilinen grafen, olağanüstü elektronik, termal, kimyasal ve mekanik özelliklere sahiptir. Van der Waals ile birleştirilmiş grafen katmanları, iyi bilinen AB istiflenmesine yol açarak grafit oluşturur. Grafit üretimi için çeşitli yöntemlerin varlığına rağmen, büyük ölçekte grafen üretimi, etkili tekniklerin bulunmaması ve üretim süreci sırasında yapısal kusurların ortaya çıkması nedeniyle zorlu olmaya devam ediyor. Potansiyel bir çözüm olan pul pul dökülmüş grafit (EG), tipik olarak grafit interkalasyon bileşiklerinin (GIC'ler) ısıl işleminden üretilmektedir. Özellikle düşük sıcaklıklarda önemli genleşme özellikleri sergileyen melamin, sınırlı çalışmalarda bir ara bileşik olarak kullanılmıştır. Bu çalışmada melaminin grafit içerisine dahil edildip ısıl işleme tabi tutulduğunda grafen katmanlarının genişlemesini tetikleme potansiyeline odaklanılmıştır. Yapısal değişiklikleri değerlendirmek için Raman ve X-ışını kırınım analizleri kullanılmıştır.

Keywords

Grafit, grafitin genişlemesi, g-C3N4, ısıl işlemler

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