| Graphene has attracted great attention due to its unique and superior mechanical, electrical and physical properties, and has broad prospects both in fundamental researches and industrial applications. Simple blending of graphene and other materials is no longer widely used, but the preparation and application of various macroscale graphene architectures are focused on and urged required. Currently, shortages like high energy loss, complex reaction processes and lab-scale preparation seriously limited the widespread of 3D graphene architectures, and to find an efficient method to prepare 3D macroscale graphene architectures is one important and challenging topic. Since the properties are strongly depended on the structures, the graphite oxide (GO) sheets, as a graphene precursor which often decorated by abundant oxygen functional groups, provide the possibility to realize large-scale and low-cost preparation of 3D graphene networks. Taking the advantages of 6OCo γ ray irradiation, such as high energy, high penetration, low pollution, and so on, we have prepared graphene/polyacrylamide composites (G-PAM) from GO, taken a detailed study about the impact between the raw ratios of GO and acrylamide (AM) and composite structures, and explored the relationship between structure and performance of G-PAM.A facile one-step method to obtain three-dimensional (3D) double network graphene/polyacrylamide architecture (DNGA) which was constructed by radiating GO and AM mixture via y-ray irradiation is presented. The resultant DNGA with an ordered double network macroporous structure achieved high compressive strength (1.45 MPa), which was quadruple compared with that in previous reports. After being thermal-annealed at 800℃ in N2 atmosphere, the obtained DNGA/N2 with stable porous structure exhibited an excellent Young’s modulus (2.93 MPa), which was triple higher than that reported in the latest literature. After thermal-annealing process, the conductivity of DNGA/N2 was increased to 8.49 S/m, which was almost fortyfold to that of DNGA (0.212 S/m). Considering the outstanding compressive property of DNGA and DNGA/N2, a series of analyses supported the strengthening mechanisms of the specific network. The present results suggest that the convenient synthetic approach can act as a potential candidate for fabricating 3D graphene materials, which may provide insight into a meaningful development of large-scale and low-cost preparation of 3D graphene networks.In addition, we prepared a series of G-PAM by adjusting the ratios of GO and AM mixture. The morphology of G-PAM has been comparative analyzed by scanning electron microscopy, atomic force microscopy and transmission electron microscopic, which presented that G-PAM tends to form microholes with the increasing content of AM, and double network structure can be formed after reaching a certain content. The structural characterization of G-PAM was further analyzed by FTIR, XRD, TGA, etc.. The performance of G-PAM in adsorption properties of methylene blue and Pb(Ⅱ) revealed the depth affection of AM in the form ation of the composites, so did the conductive property of G-PAM after thermal-annealing. In this work, we found that the structure of the graphene composites can be controlled by adjusting the ratio of materials via this method, so the foundations and results would provide some theoretical and technical support for synthesis of graphene composites and its applications.
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