Influence of environmental conditions on graphene resistance

Abstract

The influence of the wet and warm atmosphere on CVD graphene was investigated. The CVD graphene grown on Cu foil and then transferred onto the BK7 glass substrate was applied in the experiments. The environmental conditions were established using designed environmental chamber. The wet (RH = 80%) and warm (T = 32 ºC) atmospheres were applied for up to eight hours every day for nine days experiment. Rest of time the sample was stored in room conditions. The small changes of the graphene resistance were observed during experiment. SEM and EDS observations demonstrated crystallization of the water impurities like chlorides and organics on the graphene surface under applied conditions. The changes of the graphene wettability caused by condensed contamination may cause the observed resistance changes.