碳纳米管的变温场发射

Field emission of carbon nanotubes

考察了温度变化对沉积在钨丝针尖上的碳纳米管场发射的影响,发现碳纳米管场发射电流随温度升高而增大,场发射电流的稳定性基本没有变化.多根碳纳米管的场发射特性随温度变化出现偏离Fowler-Nordheim理论的现象,这种现象可能来自碳纳米管的不均匀性.

The temperature dependence of field emission from multiwalled carbon nanotubes deposited on a W tip was studied. It is found that the emission current increases with increase of temperature, while the stability of the emission current did not change. The field emission characteristic deviates from classic Fowler-Nordheim theory. This may result from a dispersion in the field enhancement factor of the carbon nanotubes.