Really depends on the device. Single graphene large layer is transparent (+ conductive + good diffusion barrier + strong + many others). Multiple graphene layers will of course increase the conductivity, barrier properties, strength etc, compared to single layer, but will also decrease transparency. So its a matter of what is important for the device.
Really depends on the device. Single graphene large layer is transparent (+ conductive + good diffusion barrier + strong + many others). Multiple graphene layers will of course increase the conductivity, barrier properties, strength etc, compared to single layer, but will also decrease transparency. So its a matter of what is important for the device.
If the device doesn't need graphene's transparency, then there is no need for single layer. However, some sensors need graphene to have a bandgap, which changes according to the analyte. In that case, you would be better off with graphene oxide rather than graphene.