This page contains detailed information about Graphene Oxide.
What is Graphene ?
Graphene is a two-dimensional honeycomb arrangement of carbon atoms that has led to revolutionary advances in technology. The discovery of graphene is so important that it earned Russian scientists Andre Geim and Konstantin Novoselov the 2010 Nobel Prize in Physics for their discoveries. Almost all the materials we encounter in the universe are three-dimensional. Scientists also know very little about how a material’s properties change when it is in a two-dimensional arrangement. The properties of graphene are also very different from graphite, which is the three-dimensional arrangement of carbon, so graphene studies are very useful in predicting how materials acquire properties in two-dimensional arrangement.
What is Graphene Oxide?
Graphene oxide is considered the oxidized form of graphene. The discovery of graphene oxide predates the discovery of graphene. In 1859, GO was first synthesized by oxidation and exfoliation of graphite. However, until the discovery of graphene, graphene oxide was seen as an insignificant material. After the discovery of graphene, graphene oxide also attracted attention as a viable way to obtain graphene. After this point, studies on graphene oxide gained momentum and were integrated into various applications. GO synthesis is mainly produced by a top-down approach. It is obtained by treating graphite with strong oxidants or sulfuric acid and potassium permanganate followed by mechanical exfoliation methods such as sonication and shear stress. However, it is also possible to obtain GO by bottom-up synthesis methods such as chemical vapor precipitation (CVD). During the production process, the sp2 structure of the graphite layers is disrupted and several different oxygen-containing functional groups such as carboxyl, hydroxyl or epoxy groups are obtained. Oxidation of graphite layers increases the spacing between layers. The next step of exfoliation is done by separating the graphite oxide layers from each other to obtain a solution of homogeneous graphene oxide layers. Different parameters such as initial oxidation conditions, energy supplied, energy source and lateral size of graphite used as starting material have strong effects on the resulting GO structure and oxidation level. Through the manipulation of these parameters, it is possible to make changes to the properties of GO. In particular, the oxidation level strongly influences the chemical variability of GO sheets.
Properties of Graphene
Uses of Graphene
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