Abstract
AbstractIn this study, graphene colloids were prepared using the electric spark discharge method (ESDM) with graphite rods (99.9% purity) in deionized water (DW) at a normal temperature and pressure. Five different types of graphene colloids were prepared using an electrical discharge machine (EDM) with five different pulse cycle switching times (Ton:Toff) = 10:10, 30:30, 50:50, 70:70, and 90:90 μs. According to the Ultraviolet-visible spectra (UV-Vis) and Zetasizer analysis, the results showed that the 10:10 μs parameter was the most suitable for the preparation of graphene colloids. UV-Vis was also used to detect the concentration of the graphene colloids; a comparison with a graphene oxide (GO) confirmed that this method could be used to calculate the discharge time needed to produce graphene colloids with different concentrations in the ESDM process.
Highlights
Graphene is completely different from graphene oxide (GO) in nature and can be clearly distinguished by chemical bonding
In this study, graphene colloids were prepared using the electric spark discharge method (ESDM) with graphite rods (99.9% purity) in deionized water (DW) at a normal temperature and pressure
It could be known from the literature [15] that the peaks of the UV-Vis characteristics of GO and graphene are completely different (230 and 262 nm, respectively), from the viewpoint of the chemical bond, the difference between the two is only whether the oxygen atom is inserted into the broken carbon atom layers or not; the orbital domain formed by the carbon itself does not change dramatically
Summary
Graphene is completely different from GO in nature and can be clearly distinguished by chemical bonding. There are numerous chemical preparation methods for graphene, including chemical vapor deposition [11], chemical exfoliation [12], the Hummers method [13], and the epitaxial growth method [14], of which the Hummers method is the method that can produce GO with different concentrations in large quantities and with properties that are closely related to this study It could be known from the literature [15] that the peaks of the UV-Vis characteristics of GO and graphene are completely different (230 and 262 nm, respectively), from the viewpoint of the chemical bond, the difference between the two is only whether the oxygen atom is inserted into the broken carbon atom layers or not; the orbital domain formed by the carbon itself does not change dramatically. Because ESDM cannot control the concentration of nanometer colloids as meticulously as the chemical method in the process, the new qualitative and quantitative method provides a mechanism for judging the concentration, which can be used to accurately grasp the concentration of nanometer colloids during ESDM preparation
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