Graphene oxide is an important derivative of graphene-based materials. Although the oxidation process destroys the highly conjugated structure of graphene, it still maintains special surface properties and layered structure. The introduction of oxygen-containing groups not only makes the graphene oxide chemically stable, but also provides surface modification active sites and a larger specific surface area for the synthesis of graphene-based/graphene oxide-based materials. Graphene oxide, as a precursor and support carrier for the synthesis of graphene-based composite materials, is easy to functionalize and has high controllability. In the process of compounding with metals, metal oxides, high molecular polymers and other materials, it can provide a large specific surface area to effectively disperse the attached materials and prevent agglomeration.
Graphene oxide also shows its own excellent physical, chemical, optical, and electrical properties, and due to the coexistence of various oxygen-containing functional groups on the base and edges of the graphene sheet framework, the graphene oxide can be controlled by The type and number of oxygen-containing functional groups are used to modulate its conductivity and band gap. The material has a wide range of applications. Graphene oxide is a new type of carbon material with excellent properties, with a high specific surface area and abundant functional groups on the surface. Graphene oxide composite materials, including polymer composite materials and inorganic compound materials, have a wide range of applications, so the surface modification of graphene oxide has become another research focus.
1 Optoelectronics In 2016, Karteri et al. studied organic thin film transistors with SiO2/GO double insulating layers and their photoresponse characteristic devices. The addition of GO not only increased the type and thickness of the insulating layer, but also enhanced the characteristics of the transistor. 2 solar cells Use GO instead of PEDOT:PSS as the hole transport layer of polymer solar cells, and obtain similar photoelectric conversion efficiency (PCE). The effect of different GO layer thicknesses on polymer solar cells is studied. It is found that when the GO film thickness is 2 nm, The device has the highest photoelectric conversion efficiency. 3 Flexible sensor Since GO contains many hydrophilic functional groups, it is easy to be modified. In addition, its large specific surface area, good dispersion, and good humidity sensitivity make it an ideal sensor material, especially in the field of flexible sensors. 4 Biological aspects With its unique mechanical, electronic and optical properties, GO has played a huge role in biotechnology, biomedical engineering, nanomedicine, tumor therapy, tissue engineering, drug release, bioimaging and biomolecular sensing. Compared with other spherical or planar nanomaterials, GO has a large specific surface area, high strength, easy modification, and good biocompatibility. The size, surface charge, number of layers, lateral size, and surface chemistry of GO and its alkene derivatives will have corresponding effects on biological systems. Therefore, the biosafety of GO has caused certain restrictions on its clinical application, including Their cytotoxicity, in vivo toxicity, genetic toxicity and bioaccumulation in certain organs (such as lung and liver) all need further study. With the development of material science, we will use materials with low toxicity and better biocompatibility to modify GO, so as to prepare GO with stable properties, clear structure, safe and non-toxic, so that it can be used as a safe and effective medical material.
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