论文部分内容阅读
We study the effects of temperature and different gas adsorbates (N2,O2,and CO2) on the field emission (FE) properties of graphene film.Our experimental measurements show that the turn-on field and work function both decrease with increasing temperature from room temperature (RT) to 623 K,and adsorption of O2 and CO2 will reduce the FE current of the graphene film.Moreover,the measured FE hysteresis loop is almost quenched after adsorbing O2 or CO2.A "depolarization electric field model" is proposed to explain the observed FE hysteresis behavior.