▎ 摘　　要

A cycle-testing of field emission behavior was carried out for graphene film prepared by electrophoresis deposition followed by annealing at 700 degrees C in argon atmosphere. The result shows that the graphene film displays a stable field emission characteristic after a period of conditioning. Also, it is interesting that the field emission hysteresis takes place when the film is measured in loops of rised and falled voltages. The possible physical mechanism of this hysteresis phenomenon may be relevant to the desorption/adsorption effect of gas molecules. (C) 2011 American Institute of Physics. [doi:10.1063/1.3655912]