  Today's great challenges of energy and informational technologies are
addressed with a singular compound, the Li and Na doped few layer graphene. All
what is impossible for graphite (homogeneous and high level Na doping), and
unstable for single layer graphene, works very well for this structure. The
transformation of the Raman G line to a Fano lineshape and the emergence of
strong, metallic-like electron spin resonance (ESR) modes, attest the high
level of graphene doping in liquid ammonia for both kinds of alkali atoms. The
spin-relaxation time in our materials, deduced from the ESR line-width, is 6-8
ns, which is comparable to the longest values found in spin-transport
experiments on ultrahigh mobility graphene flakes. This could qualify our
material as promising candidate in spintronics devices. On the other hand, the
successful sodium doping, this being a highly abundant metal, could be an
encouraging alternative to lithium batteries.
