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Bu çalışmada, X Işını Fotoelektron Spektroskopisi analizi ile Hummers yönteminde bir reaktif olarak kullanılan sodyum nitrat konsantrasyonunun değiştirilmesi ile elde edilen sentezlerin grafen okside dönüşüp dönüşmediği ve değişen yapısal özellikleri incelenmiştir. Kimyasal oksidasyondan sonra, 284,8 eV’de asimetrik olarak merkezlenmiş C1s genel spektrumuna uygulanan Gaussian veya Lorentz dağılım analizleriyle, yapıda farklı sayıda oksijen içeren fonksiyonel grupları (epoksi ve fenolik karbon (C-O), karbonil (C=O) ve karboksil (O-C=O)) temsil eden yeni sinyaller belirlenmiştir. Bu grupların, grafitteki sp2 hibridize karbon atomu (C-C/C=C) pikinde oluşturduğu kusur ve bozukluk nedeniyle pik yoğunluğunda önemli bir düşüşe yol açtığı gözlenmiştir. Grafit için C/O atom oranı 42,48 iken, grafen oksit numunelerinde bu değerin 1,74’e düşmesi ve grafit bazal düzlemine bağlanmış farklı oksijen içerikli fonksiyonel grupların ortaya çıkması, kimyasal oksidasyonun başarılı denecek şekilde gerçekleştiğini göstermiştir. Sentezlenen numunelerde N1s pikine hiç rastlanmaması, ürünlerin saf olduğunu ortaya koymaktadır. Sentez analizleri sonucunda, yapıdaki grupların bağ enerji değerlerinin literatür ile uyum içerisinde olduğu gözlenmiştir. Tüm bu sonuçlar ışığında farklı özelliklere sahip grafen oksit örneklerinin başarılı bir şekilde sentezlendikleri ifade edilebilir.
In this study, the X-work photoelectron spectroscopy analysis and the Hummers method of modification of the concentration of sodium nitrate used as a reactive, the synthesis obtained converted into graphene oxide or not, and the changing structural characteristics were studied. After chemical oxidation, the Gaussian or Lorentz distribution analysis applied to the asymmetrically centralized C1s general spectrum at 284,8 eV, identified new signals representing functional groups containing different numbers of oxygen in the structure (epoxy and phenolic carbon (C-O), carbonil (C=O) and carbonil (O-C=O)) These groups have been observed to lead to a significant decrease in the pic intensity due to the defects and disorders created by the sp2 hybridized carbon atom (C-C/C=C) in the graphite. The C/O atom ratio for graphite is 42.48, while the decline of this value in graphene oxide samples to 1.74 and the appearance of different oxygen-containing functional groups connected to the graphite basal level showed that the chemical oxidation occurred in a successful way. The fact that the N1s picine is not found in the synthesized samples shows that the products are pure. The synthesis analysis found that the link energy values of the groups in the structure were in harmony with literature. In light of all these results, the examples of graphene oxide with different properties can be expressed as successful synthesis.
In this study, whether the syntheses obtained by changing the sodium nitrate concentration used as a reagent in the Hummers method by X-Ray Photoelectron Spectroscopy analysis convert to graphene oxide and its changing structural properties were investigated. After chemical oxidation, new signals representing different numbers of oxygen-containing functional groups (epoxy and phenolic carbon (C-O), carbonyl (C=O) and carboxyl (O-C=O)) were determined by Gaussian or Lorentz distribution analyses applied to the C1s general spectrum asymmetrically centered at 284.8 EV. It has been observed that these groups lead to a significant decrease in the peak density due to the defect and disorder caused by the sp2 hybridized carbon atom (C-C/C=C) peak in graphite. While the C/O atomic ratio for graphite was 42.48, a decrease in this value to 1.74 in graphene oxide samples and the appearance of functional groups with different oxygen content connected to the graphite basal plane showed that chemical oxidation had occurred successfully. The fact that no N1s peak was observed in the synthesized samples indicates that the products are pure. As a result of the synthesis analyses, it was observed that the bond energy values of the groups in the structure were in harmony with the literature. In the light of all these results, it can be stated that graphene oxide samples with different properties have been successfully synthesized.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Uluslararası
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