  The electronic and transport properties of graphene modulated by magnetic
barrier arrays are derived for finite temperature. Prominent conductance gaps,
originating from quantum interference effects are found in the periodic array
case. When a structural defect is inserted in the array, sharp defect modes of
high conductance appear within the conductance gaps. These modes can be shifted
by local doping in the defect region resulting into sensing of the chemical
molecules that adhere on the graphene sheet. In general it is found that
sensitivity is strongly dependent on temperature due to smoothing out of the
defect-induced peaks and transport gaps. This temperature dependence, however,
offers the added capability for sub-mK temperature sensing resolution, and thus
an opportunity towards ultra-sensitive combined electrochemical-calorimetric
sensing.
