Realization of High-Temperature Superconductivity in Nano-Carbon Materials and Its Power Application

Nano-carbon materials (carbon nanotubes (CNTs) and graphenes) are attracting significant attention. In particular, they have possibility for realization of high- transition temperature (Tc) superconductivity (SC) (e.g., Tc 40K). In the present work, the researchers have tried to fabricate the following two novel-type CNT-based samples and measured those magnetizations: (1) Thin films of assembled sulfur-doped multi-walled CNTs (MWNTs), and (2) Arrays of boron-doped MWNTs synthesized on SiC substrate. They find that the former exhibits Meissner effect with the highest Tc of 22K similar to that in boron-doped CNTs. This Tc value is the highest in carbon materials except for fullerene-based SC. It is, however, instable and reproducibility is poor.