  There are claims of synthesis of a room temperature superconductor. However,
these claims have not been officially accepted by scientific communities.
Currently, the highest transition temperature (Tc) recognized in scientific
articles is 135 K at 1 atm of Hg-Ba-Ca-Cu-O system which is a copper oxide
superconductor. We packed graphite flakes into a ring-shaped
polytetrafluoroethylene (PTFE) tube and further injected heptane or octane.
Then we generated circulating current in this ring tube by electromagnetic
induction and showed that this circulating current continues to flow
continuously at room temperature for 50 days. This experiment suggests that
bringing alkane into contact with graphite may result in a material with zero
resistance at room temperature. In addition, we showed by means of AC
resistance measurements using the two-terminal method that the resistances of
graphite fibers brought into contact with various alkanes suddenly change at
specific critical temperatures between 363 and 504 K. In this study, we show
that after a magnetic field is applied to a single-layer graphene at room
temperature, alkane is brought into contact with the single-layer graphene,
then the graphene excludes the magnetic field immediately. This phenomenon
demonstrates that the alkane-wetted single-layer graphene shows Meissner effect
at room temperature. Furthermore, we applied a magnetic field perpendicularly
to the annular single-layer graphene brought into contact with n-hexane and
immediately removed the magnetic field. After that we observed that a constant
magnetic field generates from this annular graphene for some time. In
conclusion, the single-layer graphene brought into contact with alkane shows
Meissner effect at room temperature, which provides definitive evidence for
room temperature superconductivity.
