Transfer-printing of single DNA molecule arrays on graphene for high-resolution electron imaging and analysis.

Nano letters

PubMedID: 21919532

Cerf A, Alava T, Barton RA, Craighead HG. Transfer-printing of single DNA molecule arrays on graphene for high-resolution electron imaging and analysis. Nano Lett. 2011;11(10):4232-8.
Graphene represents the ultimate substrate for high-resolution transmission electron microscopy, but the deposition of biological samples on this highly hydrophobic material has until now been a challenge. We present a reliable method for depositing ordered arrays of individual elongated DNA molecules on single-layer graphene substrates for high-resolution electron beam imaging and electron energy loss spectroscopy analysis. This method is a necessary step toward the observation of single elongated DNA molecules with single base spatial resolution to directly read genetic and epigenetic information.