  We investigate the Fermionic Casimir effect at finite temperature for two
parallel chain of adatoms in a Graphene sheet, and the corresponding Casimir
force is interpreted as an interaction between the adatom chains. We apply
useful techniques to find asymptotically explicit expressions for the Casimir
energy, for small as well as large temperatures (with respect to the effective
temperature of the Graphene). We obtain a value in the order of $10^{-2} N/m$
for the Casimir force between (per unit length of) the adatom chains being one
nanometer apart, which is considerably noticeable e.g. in comparison to the
experimental values for built-in tension of a suspended Graphene sheet.
