Expanded graphene oxide fibers with high strength and increased elongation.

We report the role of chemically expanded graphite in the fabrication of high-performance graphene oxide fibers by wet spinning. X-ray diffraction peak showed that the interplanar distance of the expanded graphene oxide (EGO) fiber was more than that of graphene oxide (GO) fiber due to the expanded graphite. X-ray photon spectroscopy analysis revealed that EGO was more oxidized than GO.

Mechanical exfoliation and electrical characterization of a one-dimensional NbSe atomic crystal.

A novel semiconductor 1D nanomaterial, NbSe, was synthesized on a bulk scale simple vapor transport reaction between niobium and selenium. Needle-like single crystal NbSe contains numerous single NbSe chains linked by van der Waals interactions, and we confirmed that a bundle of chains can be easily separated by mechanical cleavage. The exfoliated NbSe flakes exhibit a quasi-two-dimensional layered structure, and the number of layers can be controlled using the repeated-peeling method.