Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 5, Pages 1850-1855Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp53106f
Keywords
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Funding
- Ministry of Science and Technology of China through a 973-Project [2012CB619401, 2012CB619402]
- Natural Science Foundation of China [51002161, 11204230, 11204228]
- Top Hundred Talents Program of Chinese Academy of Sciences
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We study the effect of different gas adsorbates (N-2, O-2, and CO2) on the field emission (FE) properties of graphene film. Our experimental measurements show that, except for N-2, adsorption of O-2 and CO2 reduces the FE current of the graphene film. Moreover, the measured FE hysteresis loop is almost quenched after adsorbing O-2 or CO2. The ab initio calculations quantify the experimental results by predicting a larger work function and smaller FE current for the graphene system after O-2 or CO2 adsorption. In contrast, the change of FE properties in N-2 adsorbed graphene is negligible. A depolarization electric field model is then proposed to explain the observed FE hysteresis behavior.
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