Field emission properties of carbon nanotubes films in the optimal experimental conditions

In this paper,we reported the CNTs films were directly synthesized on stainless steel substrates by MPCVD without pre-coating of catalyst layer,and especially investigated the influence of the reaction temperature,pressure,deposition time,and methane flow rate on field emission from such deposited carbon nanotubes films by the cross design method.The results showed that:under different prepared conditions,the field emission properties of carbon nanotubes films are very different,which play a major role is the reaction temperature and pressure.To maintain the flow of hydrogen(100mL/min) constant,temperature of 700-800℃,the reaction chamber pressure of 6.5kPa,the field emission properties of the is best,the turn-on field strength only is 0.8 V/μm,and emission sites are dense and uniform.