Preparation and Characterization of Graphene Oxide

Abstract

Graphene oxide (GO) films with two-dimensional structure were successfully prepared via the modified Hummer method. It is proven that redox method is a promising way to synthesize GO films on a large scale. Comprehensive characterizations of the properties of GO films were conducted. TEM and DFM analyses showed that GO sheets prepared in this study had single and double lamellar layer structure and a thickness of 2~3 nm. X-ray diffraction (XRD) was selected to measure the crystal structure of GO sheet. Fourier-transform infrared spectra analyzer (FT-IR) was used to certify the presence of oxygen-containing functional groups in GO films. The tests of UV-VIS spectrometer and TGA analyzer indicated that GO sheet possessed excellent optical response and outstanding thermal stability. Elemental analyzer (EA) and X-ray photoelectron spectroscope (XPS) analyzed the components synthetic material. Simultaneously, chemical structure of GO sheet was described in this study. Discussion and references for further research on graphene are provided.

Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation

“…The nanoparticles used in the present study were synthesized using the previously established method (Chae et al 2003;Song et al 2014;Wang et al 2012;Zak et al 2016). The synthesized particles were characterized for their morphological investigation using TEM (Fig.…”

“…A modified Hummer's method (Wang et al 2012;Song et al 2014) was used to synthesize GO, and functional groups (e.g., epoxy, hydroxyl, carboxyl) on the surface allowed for its dispersion in polar solvents including water. In brief, 50 mL of concentrated sulfuric acid (H 2 SO 4 ) was added into a beaker containing 2 g of graphite (45 lm, Sigma-Aldrich, MO, USA) at room temperature.…”

Graphene Oxide as An Efficient Photocatalyst For Photocatalytic Reduction of CO2 Into Solar Fuel

“…In addition, O1s spectra exhibited higher percentage of phenolic groups, C-O (40.36 %), at 533.48 eV. Peaks of oxygen functional group along with carbon indicate the oxidation of graphite into GO and would enhance adsorption and photocatalytic reduction of CO2 [42].…”

Nanolif Yapılı Poli (Akrilonitril-Vinil Asetat)/ Grafen Oksit Yapıların Karakterizasyonu

“…İki boyutlu, tek atom kalınlığında ve kuvvetli bağ yapısı ile eşsiz moleküler bir yapı olan grafen, çok iyi elektriksel, elektrokimyasal, optik, termal ve mekanik özelliklere sahiptir. Bu önemli özellikleri ile grafen materyali, termal ve elektriksel iletkenliğin-de, nanokompozitleri güçlendirmede, saydam iletken filmlerde, ultra ince karbon filmlerde, elektronik devrelerde, sensörlerde (kimyasal ve biyosensörler), ilaç ve gen salınım araçlarında, ağır metalleri ayrıştırmada, nanoelektronikte, ekranlar için saydam ve esnek elektrotlarda, enerji depolama cihazlarında uygulama alanları bulmaktadır [3,4].…”

“…Grafenin aksine, yapısında çeşitli oranlarda karbon, oksijen ve hidrojen bulunduran [3,5,6] grafen oksidin (GO), çözeltilerde kolaylıkla disperse olması, dielektrik özelliği, şeffaflığı, elektronik özelliklerinin ayarlanabilir olması ve üstün mekanik özellik-leri sebebiyle kullanım alanları gün geçtikçe genişlemektedir. Diğer yandan hidrofilik özellikli olan GO sp 2 bağlarının bozulması sebebiyle elektriksel iletkenlik açısından yalıtkan sınıfına girmektedir [7,8].…”