Arxiv.org paper from University of Cambridge group has incredibly intelligent method of using a commodity epson deskjet printer to print large area graphene devices. Starting with flakes of pure graphite, they exfoliated layers of graphene using liquid phase technique using N-Methylpyrrolidone (NMP) as a solvent. They then ultracentrifuged and then filtered to remove particles larger than 1μm that may block the ink-jet printer heads. This forms the graphene-polymer ink, which was printed, using a modified Epson Stylus 1500 inkjet printer, onto Si/SiO2substrates and the transparent substrate borosilicate glass. Finally the excess solvent is removed by annealing.
This is another milestone is bringing graphene to practical devices.
Ink-Jet Printed Graphene Electronics, arXiv:1111.4970v1 [cond-mat.mtrl-sci]