Analysis of contact resistance in single-walled carbon nanotube channel and graphene electrodes in a thin film transistor.

In this work, we present the experimental investigation on the contact resistance of graphene/single-walled carbon nanotube (SWCNT) junction using transfer length method with the simple equivalent circuit model. We find that p-n like junctions are formed in graphene/SWCNT transistors, and the contact resistance in the junction is observed to be ~ 494 and ~ 617 kΩ in case of metallic SWCNT (m-SWCNT) and semiconducting SWCNT (s-SWCNT), respectively. In addition, the contact resistance increases from 617 to 2316 kΩ as V increases from - 30 to - 10 V.

Generation of cellular micropatterns on a single-layered graphene film.

Micropatterns of fibroblast and hippocampal neurons are generated on a single-layered graphene substrate. A large-area (1 cm × 1 cm) graphene film on Si/SiO2 is functionalized by surface-initiated ATRP of non-biofouling oligo(ethylene glycol) methacrylate, after grafting of the polymerization initiator bearing α-bromoisobutylate via photoreaction of the perfluorophenyl azide group. The microcontact printing-assisted spatio-selective reaction, after chemical activation of the terminal hydroxyl group of oligo(ethylene glycol) in the polymeric film, is utilized to generate the patterns of fibroblast and hippocampal neurons.