Surface science and engineering of reduced graphene oxide for graphene-based nano-electronics and ultracapacitors
Başlık çevirisi mevcut değil.
- Tez No: 401242
- Danışmanlar: PROF. YVES J. CHABAL
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: The Unıversıty Of Texas At Dallas
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Graphene is a sp2-hybridized carbon nanosheet with delocalized benzene rings that has unique electrical, optical and mechanical properties. A major driving force for its large area production,high scalability and high volume manufacturability is necessary for its use in industrial applications. Graphene is therefore a promising nano material because of its possible implementation for nano electronics for scaling down the transistors. Therefore, wet processes are necessary for sustainable manufacturing, handling and shaping these sheets in nano scales. For this purpose, understanding graphene sheets in solution environment with direct contact to liquids is tremendously significant since its chemical modification is necessary to derive graphene or graphite into desirable nanostructures to mimic their outstanding properties with a good control of chemistry. Changes in surface or edge interactions result in modified graphene sheets (modified via wet chemistry, thermal processing or combination of both from reduction of graphite or graphene oxide) that are different in terms of their physical and chemical properties. Once many layers are present within different thicknesses, interlayer interactions are intact between the layers or closer to the edges that vary its edge properties. Although the presence of defects in pure graphene is unwanted, defects to certain extents may be also desirable for modified graphene sheets that can easily tailor its surface and edge properties. Therefore,both evaluation of sheet interactions in the presence of oxygen and understanding the oxygen interactions at the sheet edges, within the defective sites, between the sheets and at the interlayers is of main scope of this dissertation. For this purpose, in-situ infrared spectroscopy technique is studied with thermal annealing and supported by other characterization techniques such as x-ray photoelectron spectroscopy, x-ray diffraction, optical microscopy, atomic force microscopy and thermal gravimetric analyses. Apart from these experimental methods,theoretical calculations such as density functional theory simulations are also provided formechanistic details of the experimental findings.
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