Q: What is reduced graphene oxide? A: Reduced graphene oxide(rGO) is produced by GO after reduction.The chemical reduction process produced rGO compare with physical method produced graphene nanoplatelets(GNP), still keep two defects: one is residual oxygen-containing functional groups,hydroxyl and carboxyl groups can be effectively reduced, but carbonyl groups are difficult to be reduced; the other one is the hole, during the process of rGO , the oxidation and washing stage will lead to the loss of carbon skeleton and the formation of holes in the lamellar layer, which can not be repaired during reduction.
Q: What types of graphene materials are there? A: According to the different preparation processes, graphene materials can be divided into two categories: graphene oxide and graphene, and graphene can be divided into graphene nanoplatelets prepared by physical method, usually denoted by GNP, and reduced graphene oxide prepared by chemical reduction process, usually denoted by rGO, according to the different preparation processes.
Q: What are the different conditions of use for these three types of graphene products? A: GO has better hydrophilicity and can be stably dispersed in water without adding any additives, but some lattice defects are introduced in the process of oxidative intercalation, so GO is almost non-conductive; GNP has a complete lattice and better electrical conductivity, but GNP is highly hydrophobic and extremely difficult to be dispersed without dispersing additives and the number of layers is higher than that of graphene oxide.The conductivity and dispersibility of rGO is between GO and GNP, and it is necessary to add appropriate amount of dispersing additives in the process of using.
Q: Has the rGO dispersion liquid been ultrasonically treated ? Does it need to be ultrasonically dispersed again before use? A: The rGO dispersion liquid has been ultrasonically treated before shipping, because dispersion of rGO is worse than GO, we advise to repeat the ultrasound for 5~10min before use.
Q: How to do if rGO's dispersion effect become worse after storage for a period of time ? A: A small amount of sodium cholate surfactant can be added to the dispersion system to reduce the surface tension of graphene and enhance its dispersion effect
Q: How to store rGO dispersion liquid? A: It is recommended to keep it in ventilated, cool and dry environment, and store it separately from strong oxidizers and flammable materials.
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