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This paper reports on the topological effects of three-dimensional (3D)porous graphene with tunable pore sizes and a preserved 2D graphene system ofDirac quasiparticles on its electrical properties. This 3D architecture ischaracterized by the intrinsic curvature of smoothly interconcnected graphenesheets without edges, the structures and properties of which can be controlledwith its pore sizes. The impact of pore size on the electrical transportproperties was investigated through magnetoresistance measurements. We observedthat 3D graphene with small pores exhibits transitioning to weak localizationwith decreasing temperature. The comparison with the theory based on thequantum correction clarified that an increase in the intrinsic curvaturesignificantly induces the intervalley scattering event, which breaks thechirality. This increase in the intervalley scattering rate originates from theunique topological effects of 3D graphene, i.e., the topological defectsrequired to form the high curvature and the resulting chirality mixing. We alsodiscuss the scattering processes due to microscopic chemical bonding states asfound by high spatial-resolved X-ray photoemission spectral imaging, to supportthe validity of our finding.

Topological effects of three-dimensional porous graphene on Dirac quasiparticles