Mechanical Properties of GO Nanostructures Prepared from Freeze-Drying Method

Abstract

Recently, 3D graphene oxide (GO) has attracted much attention due to its high specific surface area, multifunction, and facile preparation. Here, porous GO foams with extraordinary mechanical properties were prepared by using freeze-drying technique. The structure and mechanical properties of the GO foams have been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, atomic force microscopy, and electronic universal testing machine. The unique structure endows the GO foams excellent elasticity, which can recover to its original shape even after compression hundreds of times. The density of GO foams has a significantly positive impact on the elastic modulus. Furthermore, the compressive strength of GO foams decreased linearly with decreasing relative humidity. A honeycomb model was constructed to investigate the effects of wall thickness, length, and included angle on the elastic modulus of GO foams. The structural evolution during the compression was revealed by finite element simulation.

Electrochemical Corrosion Resistance and Electrical Conductivity of Three-Dimensionally Interconnected Graphene-Reinforced Cu Composites

“…To reveal the 3-dimensionally interconnected graphene network (3DIGN), the 3Di Gr-Cu composite sample was placed into the etchant for more than 12 h. When the Cu was completely etched away, the remaining 3DIGN was washed carefully with deionized (DI) water several times. To avoid structural damage due to capillary forces the freeze-drying method was employed to obtain free-standing 3DIGN [24].…”