Multi-dimensional Macroscopic Graphene Preparation And Properties Of The Composite Material Research

Carbon nanomaterails are rised in recent years which consist of fullerence,carbon nanotube,graphite,diamond and graphene.Graphene has high specific surface area,transparency,strength,thermal conductivity and carrier mobility etc.Grapheme has been widely applied in catalytic,lithium-ion batteries,solar cell,supercapacitors,enhanced Raman,sensing,hydrogen storage,transistors,displays and superconducting materials and other fields.Graphene/inorganic nanocomposites can be synthesized by a variety of synthetic methods based on graphene and inorganic nanoparticles.The composite materials can not only keep their own unique excellent performance of graphene and inorganic nanomaterials,but also produce new unique performance.The composite materials have been developed in catalytic,energy storage,sensing and so on due to their complementary advantages between raw materials.In this thesis,flexible graphene@SnO₂ composite fiber and 3D graphene/Ag aerogel based on oxide graphene as precursor were prepared via in situ chemical reduction,irradiation induced reduction methods and self-assembly method.At the same time,graphene/Ag aerogel was employed as adsorption materials for iodine.The main research contents are as follows:1.Graphene@SnO₂ composite fibers?GF@SnO₂?were prepared via in situ chemical reduction and self-assembly method.The SEM images showed that the GF@SnO₂ fibers have a relatively flat surface and quite porous interior structure.The chemical structure,morphology features,reduction degree and thermal stability of GF@SnO₂ fiber were characterized by TEM,XRD,XPS,TGA,etc.The excellent electric conductivity and mechanical properties of GF@SnO₂ was proved by conductivity test and bending resistance test.2.The three-dimensional?3D?honeycomb-like porous GO/Ag composite aerogel was in situ reduced by gamma-ray irradiation and self-assembled in the presence of isopropanol.XRD,XPS,SEM,TEM experiments revealed that GO and Ag ions could be efficiently reduction into GO and Ag NPs.In addition,Ag NPs were homogeneously attached to graphene nanosheets of the honeycomb-like porous structure with a diameter of 30–70 nm.In this work,3D graphene/Ag NPs composite aerogel?GA/Ag?could beprepared via gamma-ray irradiation-induced synthesis.3.GA/Ag was very beneficial for adsorbing iodine due to its highly porous structure.Whether iodine was dissolving in the solvent or exposed to a saturated iodine environment,GA/Ag composite aerogel could absorb it efficiently.