Polycrystalline Graphene Ribbons as Chemiresistors

Polycrystalline graphene sensors easily obtained through chemical vapor deposition ( CVD) have been developed for chemical sensing. It is shown that linear defects or continuous lines of point defects on these sensors result in signifi cantly higher sensitivity than that of pristine graphene and carbon nanotube fi lm sensors. Further sensitivity enhancement is obtained by cutting the graphene into ribbons of width comparable to the linear defect dimensions ( micrometers).