The effect of carbon containing gasses on the field emission degradation rate of carbon nanotube field emission devices has been measured. Long chain hydrocarbons were seen to form a carbonaceous deposit on the anode surface which effectively lowered the degradation rate. Simple hydrocarbons such as methane, ethylene, and acetylene reversed degradation by continually enhancing emission. This continuous enhancement was repeatable and continued over 500h. Carbon dioxide exposure at low partial pressures resulted in an increased field emission degradation rate similar to oxygen and water exposure as reported earlier.
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Fennimore et al. (2008) studied this question.
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