  We demonstrate ink-jet printing as a viable method for large area fabrication
of graphene devices. We produce a graphene-based ink by liquid phase
exfoliation of graphite in N-Methylpyrrolidone. We use it to print thin-film
transistors, with mobilities up to~95cm^2V^(-1)s(-1), as well as transparent
and conductive patterns, with~80 % transmittance and~30kOhm/sq sheet
resistance. This paves the way to all-printed, flexible and transparent
graphene devices on arbitrary substrates
