The typical Raman spectrum of carbon materials contains bands marked as D, G and 2D. This method gives a large amount of information about the testing materials and, importantly, is a nondestructive method. The characterization of carbon materials can be performed using many methods, but one of the more interesting methods is Raman spectroscopy (RS). For this reason, it is necessary to characterize products from different preparation methods. Materials prepared through different methods will have difference properties. īased on the literature the kind of graphite and the oxidation/reduction method have large impacts on the kind of functional groups present in the final product (in rGO and GRO). The reduction step can also be completed through several methods, such as the environmentally methods of flash photoreduction, hydrothermal, catalytic reduction and thermal annealing.
Currently, one of the most popular methods of obtaining graphene oxide is the method proposed by Hummers, but other methods (e.g., that proposed by Staudenmeier and Brodie) are also well-known. RGO is obtained by the oxidation of graphite (the obtained material is called graphite oxide (GRO)) followed by reduction and exfoliation. However, the properties of the gas sensors depend on the properties of sensor layers, which are related to the preparation method of the material. This material can be used for many purposes e.g., in gas sensing structures. One of the most interesting types of these carbon-based materials is reduced graphene oxide (rGO). These materials have been utilised in many applications, e.g., supercapacitors and thin film transistors.
Carbon-based materials are very interesting due to their stable physicochemical properties and low cost, as well as other characteristics.
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